Metasequoia glyptostroboides

File:Metasequoia bonsai photo D Ramey Logan.jpg

Although it was commonly known from the fossil record from across the northern hemisphere, the dawn redwood was considered extinct until the mid-twentieth century. When the genus Metasequoia was first described in 1941, it was from Mesozoic Era fossils, none of which were less than 150 million years old. While studying fossil samples of the family Cupressaceae, Dr. Shigeru Miki from Kyoto University identified a divergent leaf form. He realized he had discovered a new genus, which he named Metasequoia, meaning "like a sequoia".{{Cite journal|last=Miki|first=Shigeru|date=1941|title=On the change of flora in Eastern Asia since Tertiary Period (I). The clay or lignite beds flora in Japan with special reference to the Pinus trifolia beds in Central Hondo|journal=Japanese Journal of Botany|volume=11|pages=237–303 ([https://archive.org/details/dli.ernet.240527/page/261/mode/2up p.261])}}

In the same year, Kan Duo (Toh Kan, 1903–1961), professor of Forest Management, National Central University, Chongqing, (formerly Chungking) observed an enormous living specimen while performing a survey in Sichuan and Hubei provinces. Though unaware of Miki's new genus, he recognized the unique traits of the tree. Unfortunately, while he collected some plant material, he did not attempt to identify or publish his findings.{{Cite journal |last=Ma |first=Jinshuang |date=June 2003 |title=The Chronology of the "Living Fossil" Metasequoia glyptostroboides (Taxodiaceae): A Review (1943–2003) |journal=Harvard Papers in Botany |volume=8 |issue=1 |pages=10}} This tree formed part of a local shrine, where villagers called it {{linktext|水杉}} (Shuǐshān or "water fir").{{cite journal |last1=Bartholomew |first1=Bruce |last2=Boufford |first2=David E. |last3=Spongberg |first3=Stephen A. |date=January 1983 |title=Metasequoia glyptostroboides—Its present status in central China |journal=Journal of the Arnold Arboretum |volume=64 |issue=1 |pages=105–28 |doi=10.5962/bhl.part.27404 |jstor=43782567 |doi-access=free}}This hanzi for "fir" is the same as the kanji for another species, Cryptomeria japonica, that is, sugi, Japanese cedar. sugi in Wolfgang Hadamitzky and Mark Spahn (2011), Japanese Kanji and Kana: A Complete Guide to the Japanese Writing System, Rutland, Vermont: Tuttle, p. 361, Kanji 2033. Shuǐshān continues to be the common name of dawn redwood in Chinese.{{Cite web |last=橘世代 |title=【秋意 遊記】南投杉林溪－楓紅、水杉如調色盤渲染大地 |url=https://orange.udn.com/orange/story/121417/5944176 |access-date=2024-12-08 |website=橘世代 |language=zh-TW}}

In 1943, Wang Zhan (Chan Wang, 1911–2000) of the National Bureau of Forest Research, the Ministry of Agriculture and Forests, Chongqing, collected samples from an unidentified tree in the village of {{Ill|Moudao|zh|谋道镇}} (formerly Motaochi, Maodaoqi or Modaoxi){{Cite journal |last=Ma |first=Jinshuang |date=June 2003 |title=The Chronology of the "Living Fossil" Metasequoia glyptostroboides (Taxodiaceae): A Review (1943–2003) |journal=Harvard Papers in Botany |volume=8 |issue=1 |pages=9}}{{citation |last=Jonnes |first=Jill |title=Urban forests: a natural history of trees and people in the American cityscape |pages=135–137 |year=2016 |publisher=Viking |isbn=9780670015665}} in Lichuan County, Hubei province—now believed to be the same tree Kan discovered.{{cite journal |last1=Ma |first1=Jinshuang |last2=Shao |first2=Guofan |year=2003 |title=Rediscovery of the 'first collection' of the 'Living Fossil', Metasequoia glyptostroboides |journal=Taxon |volume=52 |issue=3 |pages=585–588 |doi=10.2307/3647458 |jstor=3647458}} The samples were determined to belong to a tree yet unknown to science, but World War II postponed further study.{{cn|date=April 2024}}

Professors Zheng Wanjun (Cheng Wan-Chun) and Hu Xiansu (Hu Hsen-Hsu) made the pivotal connection between Miki's fossil genus and the living samples in 1946,{{cite journal |last=Ma |first=Jinshuang |date=2003 |title=The chronology of the "living fossil" Metasequoia glyptostroboides (Taxodiaceae): A review (1943–2003) |url=http://flora.huh.harvard.edu/china/Harvard_Papers/Ma_8_1_009_018.pdf |journal=Harvard Papers in Botany |volume=8 |issue=1 |pages=9–18 |access-date=22 March 2014}} and provided the specific epithet "glyptostroboides", after its resemblance to the Chinese swamp cypress (Glyptostrobus).{{cite web |title=Crescent Ridge-History |url=http://www.dawnredwood.org/HISTORY.htm |archive-url=https://web.archive.org/web/20231128015140/http://www.dawnredwood.org/HISTORY.htm |archive-date=28 November 2023}}

In July 1947, the Arnold Arboretum of Harvard University provided $250 to fund an expedition by Zheng Wanjun's assistant Hua Jingchan (Ching-Shan Hwa 1921–present) to collect seeds for the arboretum from the Metasequoia type tree in Moudao, and trees in the nearby Metasequoia Valley (Shuishaba Valley).{{cite web |url=https://www.arboretum.harvard.edu/plants/plant-exploration/expeditions-unveiled/1947-contract-collections-metasequoia-dawn-redwood/ |archive-url=https://web.archive.org/web/20180502170201/https://www.arboretum.harvard.edu/plants/plant-exploration/expeditions-unveiled/1947-contract-collections-metasequoia-dawn-redwood/ |url-status=dead |archive-date=May 2, 2018 |title=1947 Contract Collections of Metasequoia (dawn redwood) |work=Arnold Arboretum |publisher=Harvard University |date=25 September 2018 |access-date=20 June 2020}}{{Cite journal|last=Ma|first=Jinshuang|date=June 2003|title=The Chronology of the "Living Fossil" Metasequoia glyptostroboides (Taxodiaceae): A Review (1943-2003)|journal=Harvard Papers in Botany|volume=8|issue=1|pages=11}} Hua's collecting trip returned with several kilos of seed that were distributed over the next few months for growth trials to Chinese institutions; the Arnold Arboretum, Missouri Botanic Garden, and elsewhere in the United States; botanic gardens at Kew, Edinburgh, and other locations in the United Kingdom; as well as botanic gardens in continental Europe and worldwide.{{Cite journal |last=Ma |first=Jinshuang |date=June 2003 |title=The Chronology of the "Living Fossil" Metasequoia glyptostroboides (Taxodiaceae): A Review (1943–2003) |journal=Harvard Papers in Botany |volume=8 |issue=1 |pages=11–12}}

File:MetaseqLeaves.jpg|Dawn redwood foliage – note opposite arrangement

File:Metasequoia (male flowers).jpg|Pollen bearing cones

File:Metasequoia glyptostroboides young leaves.JPG|Young leaves

File:Metasequoia young female cones02.jpg|Young seed bearing cones

File:Metasequoia (cones).jpg|Mature seed bearing cones

File:Metasequoia glyptostroboides Oakland.JPG|Mature tree

[[File:Acorn of Metasequoia glyptostroboides.png|thumb]

Metasequoia glyptostroboides leaves are opposite, {{convert|1|-|3|cm|in|abbr=on}} long, and bright fresh green, turning a foxy reddish brown in autumn. The pollen cones are {{convert|5|-|6|mm|in|abbr=on}} long, produced on long spikes in early spring; they are produced only on trees growing in regions with hot summers. The cones are globose to ovoid, {{convert|1.5|-|2.5|cm|in|abbr=on}} in diameter with 16–28 scales arranged in opposite pairs in four rows, each pair at right angles to the adjacent pair; they mature in about 8–9 months after pollination.{{cn|date=April 2024}}

While the bark and foliage are similar to another closely related genus of redwoods, Sequoia, M. glyptostroboides differs from the coast redwood in that it is deciduous, like Taxodium distichum (bald cypress). Similar to T. distichum, older trees may form wide buttresses on the lower trunk. M. glyptostroboides is a fast-growing tree, exceeding {{convert|35|m|ft|abbr=on}} in height and {{convert|1|m|ft|abbr=on}} in trunk diameter by the age of 50, in cultivation (with the potential to grow to even greater dimensions). The trunk forms a distinctive "armpit" under each branch. The bark is vertically fissured and tends to exfoliate in ribbon-like strips.{{cn|date=April 2024}}

The largest dawn redwood recorded was an isolated specimen in China about {{convert|50|m|ft|abbr=off|sp=us}} tall and {{convert|2.2|m|ft|abbr=off|sp=us}} wide. This tree was killed by a lightning strike in 1951.{{Cite web|url=https://www.conifers.org/cu/Metasequoia.php|title=Metasequoia glyptostroboides|date=2019|editor-last=Earle|editor-first=Christopher J.|website=The Gymnosperm Database|access-date=8 October 2019}} Several dawn redwoods of this height still live in the eastern part of Metasequoia Valley, where the tree was discovered.{{Cite journal|last1=Bartholomew|first1=Bruce|last2=Boufford|first2=David|last3=Spongberg|first3=Stephen|date=1998|title=Metasequoia glyptostroboides-Its Status in Central China in 1980|url=http://arnoldia.arboretum.harvard.edu/pdf/articles/1998-58-4-metasequoia-glyptostroboides-its-status-in-central-china-in-1980-1983.pdf|journal=Arnoldia|volume=58|issue=4 |pages=47–52|doi=10.5962/p.251360 }} The tree's true potential size is much larger, as logs up to {{convert|8|m|ft|abbr=off|sp=us}} wide at the base have been discovered in rice paddies.

The thickest and tallest dawn redwoods listed by Monumental Trees are both at Longwood Gardens, outside Kennett Square, Pennsylvania, United States. The widest has a girth at breast height of {{convert|5.79|m|ft|abbr=on}}, average diameter {{convert|1.84|m|ft|abbr=on}}, and is {{convert|30.18|m|ft|abbr=on}} tall. The tallest is {{convert|41.15|m|ft|abbr=on}} tall, and has a girth at breast height of {{convert|3.35|m|ft|abbr=on}}, average diameter {{convert|1.07|m|ft|abbr=on}}. Both trees were planted in 1948 and measured in 2018.{{cite web|url=https://www.monumentaltrees.com/en/trees/dawnredwood/records/|title=The thickest, tallest, and oldest dawn redwoods (Metasequoia glyptostroboides)|website=www.monumentaltrees.com|access-date=30 June 2019}}

Ecotypic variation has developed in a variety of microhabitats. Three variations have been observed based on the size of their cones, large, medium, and small. The large cone type is found growing on mountain slopes, develops a broad canopy, seeds more readily and is more drought tolerant. The small cone type is found near stream banks, is more sensitive to drought, and develops a more uniform trunk.{{cite journal

| last =Li

| first =Jianhua

| title =Metasequoia: An Overview of Its Phylogeny,Reproductive Biology, and Ecotypic Variation

| journal =Arnoldia

| volume =58

| pages =54–59

| date =1998

| issue =4

| doi =10.5962/p.251359

| url =http://arnoldia.arboretum.harvard.edu/pdf/articles/1998-58-4-metasequoia-an-overview-of-its-phylogeny-reproductive-biology-and-ecotypic-variation.pdf

}}

Together with Sequoia sempervirens (coast redwood) and Sequoiadendron giganteum (giant sequoia) of California, M. glyptostroboides is classified in the subfamily Sequoioideae of the family Cupressaceae. Although it is the only living species in its genus, three fossil species are known as well. The other Sequoioideae and several other genera have been transferred from the Taxodiaceae to the Cupressaceae based on DNA analysis.{{Cite journal |last1=Gadek |first1=P. A. |last2=Alpers |first2=D. L. |last3=Heslewood |first3=M. M. |last4=Quinn |first4=C. J. |date=2000 |title=Relationships within Cupressaceae sensu lato: A combined morphological and molecular approach |journal=American Journal of Botany |volume=87 |issue=7 |pages=1044–1057 |doi=10.2307/2657004 |jstor=2657004 |pmid=10898782 |doi-access=free}}

Studies carried out between 2007 and 2009 counted 5,371 trees primarily in Lichuan, Hubei,{{cite journal|date=Fall 1999|title=Revisiting the Dawn Redwoods|url=https://www.savetheredwoods.org/wp-content/uploads/bulletin_fa99.pdf|journal=Save-the-Redwoods League Bulletin|pages=8|access-date=4 October 2019}}{{Cite book

|contribution=A conservation plan for Metasequoia in China

|first=Gaytha A. |last=Langlois

|editor-first=Ben A. |editor-last=LePage|editor2-first= Christopher James |editor2-last=Williams|editor3-first= Hong |editor3-last=Yang

|publisher=Springer |year=2005

|isbn=1-4020-2631-5

|title=The geobiology and ecology of Metasequoia

|series=Volume 22 of Topics in geobiology

|url= https://books.google.com/books?id=JfiWU-1GSqEC&pg=PA369

|page=369}} with much smaller groups in Shizhu, Chongqing and Longshan, Hunan.

The floodplain of Metasequoia Valley in Hubei had already been turned to rice paddies by the time of the tree's discovery, but was once probably a more extensive dawn redwood forest. Such a forest would have been similar to bald cypress forests in the United States, with many similar species growing in association. Nearly 3,000 trunks were found in the floor of the valley, ranging from {{convert|2|to|8|m|ft|abbr=off|sp=us}} wide at the base. Additionally, houses made of Metasequoia wood 200–300 years old still exist and probably date back to the original settlement of the valley.

Since its discovery, the dawn redwood has become something of a national point of pride, and it is protected under Chinese law and also planted widely. However, it is still listed as endangered in the wild.{{cite iucn |author=Farjon, A. |date=2013 |title=Metasequoia glyptostroboides |volume=2013 |page=e.T32317A2814244 |doi=10.2305/IUCN.UK.2013-1.RLTS.T32317A2814244.en |access-date=19 November 2021}} Listed as Endangered B1ab(iii,v), v3.1 Cutting of trees or branches is illegal, but the demand for seedlings drives cone collection to the point that natural reproduction is no longer occurring in the dawn redwood forest. In addition, the landscape has been highly modified by human use, and a 1980 expedition found that the habitat has significantly degraded since the tree's discovery. Most of the other vegetation has been cut, and most of the area is no longer suitable ground for seedlings. Between 1950 and 1980 several hundred were logged in Metasequoia Valley, some over {{convert|2|m|ft|abbr=off|sp=us}} wide.

A survey in the 2000s counted and measured all wild dawn redwoods. The remaining healthy trees range from {{convert|25|cm|in|abbr=on}} to {{convert|1.65|m|ft|abbr=on}} wide at breast height, {{convert|12|–|51|m|ft|abbr=on}} in height, and estimated 41–265 years in age. The average size was {{convert|27|m|ft|abbr=on}} tall and {{convert|0.45|–|0.9|m|ft|abbr=on}} wide at breast height, with an estimated age of about 95 years. (The type tree, {{convert|2.48|m|ft|abbr=on}} at breast height, was in poor health and therefore excluded from the study) No seedlings were found, and if they ever do appear it is legal to remove and transplant them. The species will continue to live in yards, parks and on roadsides all over China, but the M. glyptostroboides forest ecosystem could disappear when its mature trees die.

Since the tree's rediscovery, the dawn redwood has become a popular ornamental tree in parks and gardens worldwide.{{cn|date=April 2024}}

Dawn redwood seed arrived at the Arnold Arboretum on January 5, 1948, and was shipped to arboreta around the world soon after. By 1951, the species had entered the commercial horticultural trade in the United States, and following media excitement about the new discovery, including in the San Francisco Chronicle of March 25, 1948, sales soon took off.

Dawn redwood has proved an easy tree to grow in temperate regions, and is now widely planted as an ornamental tree. Planted trees have already reached at least up to {{convert|1.84|m|ft|abbr=off|sp=us}} in diameter at breast height and {{convert|41.15|m|ft|abbr=off|sp=us}} tall, despite being in cultivation for only 70 years. This rapid rate of growth has led to consideration for using the tree in forestry plantations. It has been discovered that M. glyptostroboides will thrive in standing water, much like bald cypress, and if left branched to the ground in full sun, will develop the large, contorted boles that have made bald cypress famous. Limbing or pruning at an early age will prohibit this formation later on.{{cn|date=April 2024}}

In cultivation, M. glyptostroboides is hardy to USDA Zone 5, making it hardy down to lows of {{convert|-25|°F|°C|abbr=on}}. It is tolerant of soggy, waterlogged soils; in the wild it is adapted to growing on flood plains. Until it is established in a specific site, it is vulnerable to drought and inadequate water availability. The dawn redwood is recommended for urban areas in the Midwest, Southeast, and East Coast of North America, as its fast growth rate and tolerance for air pollution make it adaptable and able to thrive where other species might suffer. The species tends to struggle without irrigation in arid climates such as the American West unless planted directly on or adjacent to a body of water such as a pond or stream. This species is also highly susceptible to damage from contact with heavy amounts of winter de-icing salt.Dirr, M. A. 1998. Manual of Woody Landscape Plants. Stipes Publishing Company, Champaign, Illinois. (1453 p.)

In the 1980s, it was discovered that many of the second-generation trees in cultivation suffered from inbreeding depression (extremely low genetic variability), which could lead to increased susceptibility to disease and reproductive failure. Many sources claim that the original 1947 seedlots came from as few as one tree; however, this has proven to be false. The original seeds did have a wide range of source trees, and the inbreeding depression is more likely to come from self-pollination by isolated trees. However, the total cultivated population still had less genetic variation than the wild ones, and more widespread seed-collecting expeditions in China in the 1990s sought to resolve this problem and restore genetic diversity to cultivated M. glyptostroboides.{{Cite journal|last=Payton|first=Greg|date=2010|title=Conserving the Dawn Redwood: The Ex Situ Collection at the Dawes Arboretum|url=http://arnoldia.arboretum.harvard.edu/pdf/articles/2010-68-1-conserving-the-dawn-redwood-the-ex-situ-collection-at-the-dawes-arboretum.pdf|journal=Arnoldia|volume=68|issue=1|pages=26–33|doi=10.5962/p.251543 |access-date=2018-03-11|archive-url=https://web.archive.org/web/20150609152024/http://arnoldia.arboretum.harvard.edu/pdf/articles/2010-68-1-conserving-the-dawn-redwood-the-ex-situ-collection-at-the-dawes-arboretum.pdf|archive-date=2015-06-09|url-status=dead}}

Pizhou, Jiangsu has the longest dawn redwood avenue in the world. The avenue is approximately 60 km long with over one million trees.[http://weddles.co.uk/wordpress/wp-content/uploads/2013/06/Arboricultural-Journal-The-creation-of-the-longest-avenue-in-the-world.pdf The Creation of the Longest Avenue in The World] {{Webarchive|url=https://web.archive.org/web/20160304031741/http://weddles.co.uk/wordpress/wp-content/uploads/2013/06/Arboricultural-Journal-The-creation-of-the-longest-avenue-in-the-world.pdf |date=2016-03-04 }}, Arboricultural Journal: The International Journal of Urban Forestry, 2013.[http://weddles.co.uk/wordpress/wp-content/uploads/2013/06/The-Horticulturist-Longest-Avenue-in-the-World.pdf The Longest Avenue] {{Webarchive|url=https://web.archive.org/web/20160304060334/http://weddles.co.uk/wordpress/wp-content/uploads/2013/06/The-Horticulturist-Longest-Avenue-in-the-World.pdf |date=2016-03-04 }}, The Horticulturalist: The Journal of the Institute of Horticulture, 2013. The Water Forest in Xinghua, Jiangsu is named after the many dawn redwood trees found there in the park.{{cn|date=April 2024}}

There is a large collection of dawn redwood in the Lushan Botanical Garden within Mount Lu, Jiangxi.{{Cite web |last=Zhang |first=Qingsong |date=2007-05-09 |title=The Development of Lushan Botanical Garden |url=https://www.bgci.org/files/Wuhan/PapersConserving/zhang.pdf |access-date=2024-02-09 |website=Botanic Gardens Conservation International}}

The dawn redwood is frequently encountered across the UK. Growth has been fastest in the south-east, but it is believed the tree may have a longer future in the more humid western regions. The first dawn redwood to be planted in the UK was at the Cambridge University Botanic Garden. The seed was not from the Arnold expedition, but came to Cambridge directly. The Botanic Garden's Annual Report for 1949 declares: 'Seeds of Metasequoia glyptostroboides, sent by Dr Silow from China to Professor F T Brooks, germinated freely. Three of the seedlings have been planted out: one in the Yard at the back of the Range and two beside the Pond (now called the Lake).'{{cite web|url=https://www.botanic.cam.ac.uk/the-garden/gardens-plantings/trees/dawn-redwood/|title=Dawn Redwood|date=2019|website=Cambridge University Botanic Garden|access-date=8 October 2019}} The tree on the south-west side of the Lake is still living, as at July 2019. Seed distributed in the 1940s to Hillier Gardens near Winchester, UK, have thrived and are now the emblem of the gardens.{{cite web|url=https://www.hants.gov.uk/thingstodo/hilliergardens/explorethegardens/jermynshouse|title=Sir Harold Hillier Gardens|website=Hampshire County Council|access-date=8 October 2019}} A sapling planted in Stratford Park, Stroud in 1953 to commemorate the coronation of Queen Elizabeth II{{Cite news |last=Anon |date=June 1953 |title=New gates and a rare tree |work=Stroud News}} is now a large tree. The TROBI Champions are at Woking Park, Surrey: 22 m height by 144 cm d.b.h, Clare College, Cambridge: 21 m × 129 cm (planted 1949), and Wayford Woods, Somerset: 32 m × 99 cm.Johnson, O. (2011). Champion Trees of Britain & Ireland. p.111. Kew Publishing. {{ISBN|978-1-84246-452-6}} Several cultivars are available providing a range of different foliage colours and textures. The cultivar 'Golden Oji' has gained the Royal Horticultural Society's Award of Garden Merit.{{cite web|url=https://www.rhs.org.uk/Plants/329955/Metasequoia-glyptostroboides-Golden-Oji/Details|title=Metasequoia glyptostroboides 'Golden Oji'|last=Royal Horticultural Society|date=2019|website=RHS|access-date=12 January 2021}}{{cite web |date=July 2017 |title=AGM Plants – Ornamental |url=https://www.rhs.org.uk/plants/pdfs/agm-lists/agm-ornamentals.pdf |access-date=4 April 2018 |publisher=Royal Horticultural Society |page=64}}

Dawn redwoods thrive over a large, crescent-shaped region that encompasses the eastern and southern United States, as well as on the West Coast. Many institutions, such as the Arnold Arboretum of Harvard University, have fine specimens. The H. H. Hunnewell estate in Wellesley, Massachusetts, has two specimens (numbers 29 and 34) that date to the initial distribution of seed by the Arnold Arboretum in 1949.{{Cite book |last=Hayward |first=Allyson |title=Private Pleasures – Derived from Tradition |work=Dissertation |year=1997 |volume=2 |pages=Appendix F, 3}} There is a small grove of dawn redwoods at Bailey Arboretum in Locust Valley, New York, including one tree which is claimed to be the world's largest by diameter.{{cite web|url=http://www.baileyarboretum.org/the-dawn-redwood/|title=The Dawn Redwood|website=Bailey Arboretum|access-date=8 October 2019}} The New York City Department of Parks and Recreation has begun planting dawn redwoods on sidewalks throughout Manhattan and Brooklyn, this [https://tree-map.nycgovparks.org/tree-map/species/54051 link] maps them. Washington, D.C.'s Urban Forestry Division{{Cite web|url=https://ddot.dc.gov/page/ddot-urban-forestry|title=DDOT Urban Forestry {{!}} ddot|website=ddot.dc.gov|access-date=2019-10-08}} has planted hundreds throughout that city, including all of the street trees in the 1800 block of Redwood Terrace, NW.{{Cite news|last=Kelly|first=John|date=21 April 2015|title=The saddest little tree in downtown Washington bears a surprise|url=https://www.washingtonpost.com/local/the-saddest-little-tree-in-downtown-washington-bears-a-surprise/2015/04/21/e6ab4e34-e7d1-11e4-9a6a-c1ab95a0600b_story.html|newspaper=Washington Post}} A dawn redwood grows outside of the Rosicrucian Research Library at Rosicrucian Park in San Jose, California, as a memorial to H. Spencer Lewis.{{Cite journal|last=Campbell|first=Clara|date=March 1980|title=Tree from the Dawn of Time|journal=Rosicrucian Digest|volume=58 March 1980|pages=22}} It was planted in 1950 from a seedling from the lot brought from China by Dr. Ralph Chaney,{{Cite journal|date=May 1951|title=Temple Echoes|journal=Rosicrucian Digest|volume=29 #5|pages=180}} and donated by an unnamed donor to H. Spencer Lewis's widow for this purpose. Additionally in San Jose, a dawn redwood is planted at San Jose State University.{{Citation |last=Pozniak |first=John |title=English: w:Dawn Redwood on the campus of w:San Jose State University. |date=2004-07-05 |url=https://commons.wikimedia.org/wiki/File:SJSU_Dawn_Redwood.JPG |access-date=2024-06-07}} The Mildred E. Mathias Botanical Garden on the UCLA campus includes a dawn redwood.{{cite web |title=Mildred E. Mathias Botanical Garden |url=https://www.botgard.ucla.edu/gardencollections/the-stream-2/}} In North Carolina, a private endeavor is working to create a Metasequoia reserve on 50 acres of uplands in the Sauratown Mountains.{{Cite web|url=http://www.dawnredwood.org/index.html|title=www.dawnredwood.org|last=Hanks|first=Doug|date=2005|website=Crescent Ridge Dawn Redwoods Preserve Website}} Portland, Oregon, is home to some of the oldest dawn redwoods in the U.S. One specimen planted in the Hoyt Arboretum in 1948{{Cite web|title=Metasequoia glyptostroboides, the dawn redwood {{!}} Urban Forestry Blog {{!}} The City of Portland, Oregon|url=https://www.portlandoregon.gov/parks/article/445468|access-date=2021-03-23|website=www.portlandoregon.gov}} was 103' tall at last measurement and in 1952 earned the distinction of being the first dawn redwood to bear cones in the Western Hemisphere in 6–8 million years.{{Cite web |title=Dawn Redwood – Oregon Travel Information Council |url=https://oregontic.com/oregon-heritage-trees/dawn-redwood/ |access-date=2021-03-23 |website=oregontic.com}}{{Cite web|title=Metasequoia glyptostroboides|url=https://www.portland.gov/trees/metasequoia-glyptostroboides|access-date=2021-03-23|website=Portland.gov|language=en}} A dawn redwood was planted at Southern Illinois University Carbondale in Carbondale, Illinois by William Marberry in 1950 and remains there.{{Cite web |title=Dawn Redwood {{!}} Arboretum {{!}} SIU |url=https://arboretum.siu.edu//selection/tree3477.php |access-date=2024-07-30 |website=Arboretum |language=en}}

In 2005, Oregon made dawn redwood the state fossil of the state.{{Cite web |title=Metasequoia {{!}} Landscape Plants {{!}} Oregon State University |url=https://landscapeplants.oregonstate.edu/metasequoia |access-date=2024-02-09 |website=landscapeplants.oregonstate.edu}}

File:Autumn metasequoia glyptostroboides.JPG|Displaying autumn foliage in Victoria, British Columbia, Canada

File:Metasequoia Glyptostroboides2.jpg|The trunk of an adult tree

File:MetasequoiaGlyptostroboides.jpg|The buttressed base of the trunk

File:Urweltmammutbaum Kurztrieb.jpg|Pollen (or "male") cones

File:Metasequoia glyptostroboides (MBG, 2011).jpg|Row of Metasequoia glyptostroboides in the Missouri Botanical Garden.

File:Metasequoia glyptostroboides Autumn leaf color.jpg|Metasequoia glyptostroboides Autumn leaf color

File:Metasequoias planted in 1950.jpg|Dawn redwoods in Spokane, WA

File:Metasequoia glyptostroboides in Sagamihara Park IMG 4025.jpg|Metasequoia glyptostroboides in Sagamihara Park

File:Metasequoia glyptostroboides IMG 4102.jpg|Contour of Metasequoia glyptostroboides

File:Metasequoia glyptostroboides Eindhoven 27 MG 3524.jpg|Metaseqoia glyptostroboides used as street trees in Eindhoven, Netherlands

File:Metasequoia glyptostroboides seeds, by Omar Hoftun.jpg|Seeds

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• He, Zican, Jianqiang Li, Qing Cai, Xiaodong Li, and Hongwen Huang. 2004. "Cytogenetic Studies on Metasequoia Glyptostroboides, a Living Fossil Species". Genetica. 122, no. 3: 269–276.
• International Metasequoia Symposium, Ben A. LePage, Christopher J. Williams, and Hong Yang. The Geobiology and Ecology of Metasequoia. Topics in geobiology, v. 22. Dordrecht: Springer, 2005. {{ISBN|1-4020-2764-8}}
• Proceedings of the Second International Symposium on Metasequoia and Associated Plants, August 6–10, 2006, Metasequoia: Back from the Brink? An Update. Edited by Hong Yang and Leo J. Hickey. Bulletin of the Peabody Museum of Natural History, Volume 48, Issue 2 31 October 2007, pp. 179–426. [http://www.peabody.yale.edu/scipubs/abstracts/abs_b48-2.html]
• Bartholomew, Bruce, D. E. Boufford, and S. A. Spongberg. "Metasequoia glyptostroboides--Its present status in central China." Journal of the Arnold Arboretum 64.1 (1983): 105–128.
• Farjon, A. (2005). Monograph of Cupressaceae and Sciadopitys. Royal Botanic Gardens, Kew. {{ISBN|1-84246-068-4}}.
• Hanks, D.A. Crescent Ridge Dawn Redwoods Preserve (2005). http://www.dawnredwood.org
• Jahren, A. H. & Sternberg, L. S. L. (2003). Humidity estimate for the middle Eocene Arctic rain forest. Geology May 2003 [https://wayback.archive-it.org/all/20070927095758/http://penguin.bio.miami.edu/leo/PDF%20articles/Jahren&Sternberg2003.pdf pdf file]
• {{Cite book

|editor-first=Ben A. |editor-last=LePage|editor2-first= Christopher James |editor2-last=Williams|editor3-first= Hong |editor3-last=Yang

|publisher=Springer |year=2005|isbn=1-4020-2631-5

|title=The geobiology and ecology of Metasequoia

|series=Volume 22 of Topics in geobiology

|url= https://books.google.com/books?id=JfiWU-1GSqEC

}}

• {{ITIS |id = 505864 |taxon = Metasequoia Glyptostroboides |access-date = September 25, 2006}}
• {{cite web|url= http://people.brandonu.ca/greenwoodd/files/2013/06/Mummified-tree-stump-of-a-dawn-redwood.pdf |title=Metasequoia stumps, Axel Heiberg Island }} {{small|(804 KB)}}
• Williams C.J., LePage, B.A., Vann D.R., Tange, T., Ikeda, H., Ando, M., Kusakabe, T., Tsuzuki, T. and T. Sweda. (2003). Structure, allometry, and biomass of plantation [http://www.fandm.edu/x13504.xml Metasequoia glyptostroboides]{{dead link|date=January 2018 |bot=InternetArchiveBot |fix-attempted=yes }} in Japan. Forest Ecology and Management, 180(103): 287-301. [https://web.archive.org/web/20080411035224/http://edisk.fandm.edu/chris.williams/pubs/williams_etal_2003.pdf]
• Williams C.J., Johnson A.H., LePage, B.A., Vann D.R. and T. Sweda. 2003. Reconstruction of Tertiary Metasequoia Forests II. Structure, Biomass and Productivity of Eocene Floodplain Forests in the Canadian Arctic. Paleobiology, 29(2): 271-292. [https://web.archive.org/web/20011105073603/http://paleosoc.org/paleobio.htm]

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• [http://www.conifers.org/cu/Metasequoia.php Metasequoia in The Gymnosperm database]
• [http://www.dawnredwood.org Crescent Ridge Dawn Redwoods Preserve]
• [https://web.archive.org/web/20070811045335/http://www.metasequoia.org/ The metasequoia organisation]
• [http://www.monumentaltrees.com/en/trees/dawnredwood/ More information on the Dawn Redwood, including largest specimens]
• [http://www.redwoodworld.co.uk Giant redwoods in the U.K.]
• [https://www.arboretum.harvard.edu/notes-on-the-dawn-redwood/ Notes on the dawn redwood] from the Arnold Arboretum, including a link to a summary of archival materials on the discovery of the dawn redwood.

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glyptostroboides

Category:Endemic flora of China

Category:Flora of Hubei

Category:Flora of Sichuan

Category:Trees of China

Category:Plants described in 1948

Category:Garden plants of Asia

Category:Ornamental trees

Category:Critically endangered flora of Asia

Category:Deciduous conifers

Category:Symbols of Oregon

Category:Taxa named by Hu Xiansu