Distylium racemosum

{{Short description|Species of plant in the family Hamamelidaceae}}

{{Speciesbox

|image=Distylium racemosum5.jpg

|image_caption=Flowers lack petals but have red calyces and maroon stamens.

|image2=Distylium racemosum SZ94.png

|image2_caption=Botanical illustration

| status = LC | status_system = IUCN3.1

| status_ref = {{cite iucn |author=Lin, Q. |author2=Botanic Gardens Conservation International (BGCI). |author3=IUCN SSC Global Tree Specialist Group. |year=2019 |title=Distylium racemosum |volume=2019 |page=e.T147377399A147614835 |doi=10.2305/IUCN.UK.2019-2.RLTS.T147377399A147614835.en |access-date=2 August 2023}}

| taxon = Distylium racemosum

|authority=Siebold & Zucc.

|synonyms_ref=

|synonyms=Distylium racemosum f. angustifolium {{small|(Masam.) H.Ohba}}

}}

Distylium racemosum, the isu tree, is a species of flowering plant in the family Hamamelidaceae.{{cite web |title=Distylium racemosum isu tree |url=https://www.rhs.org.uk/plants/5996/distylium-racemosum/details |date=2022 |publisher=The Royal Horticultural Society |access-date=21 September 2022 |quote=8 suppliers }} It is native to subtropical eastern Asia; central and southern Japan, the Ryukyu Islands, South Korea (Jeju Island), southeastern China, Taiwan, Hainan, and northern Vietnam.{{cite POWO |id=430636-1 |title=Distylium racemosum Siebold & Zucc. |access-date=21 September 2022 }} There are a number of cultivars, including 'Guppy' and the variegated 'Akebono'.{{cite web |title=Distylium racemosum 'Guppy' |url=https://www.rhs.org.uk/plants/249169/distylium-racemosum-guppy/details |date=2022 |publisher=The Royal Horticultural Society |access-date=21 September 2022 }}{{cite web |title=Distylium racemosum 'Akebono' (v) |url=https://www.rhs.org.uk/plants/164011/distylium-racemosum-akebono-(v)/details |date=2022 |publisher=The Royal Horticultural Society |access-date=21 September 2022 }}

{{gallery

|Distylium racemosum4.jpg|Flowers with leaves

|Distylium racemosum in Oyama Shrine.JPG|At Oyama Shrine

|Distylium racemosum.jpg|A young individual at a shrine in Japan

|イスの木 .jpg|A mature individual

}}