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Hymenachne

{{Short description|Genus of grasses}}

{{Automatic taxobox

|image = Hymenachne amplexicaulis 1584.jpg

|image_caption = Hymenachne amplexicaulis

|display_parents = 4

|taxon = Hymenachne

|authority = P.Beauv.[https://www.biodiversitylibrary.org/page/394127#page/132/mode/1up Palisot de Beauvois, Ambroise Marie François Joseph. 1812. Essai d'une Nouvelle Agrostographie pages 48-49] in Latin[https://www.biodiversitylibrary.org/page/394127#page/132/mode/1up Palisot de Beauvois, Ambroise Marie François Joseph. 1812. Essai d'une Nouvelle Agrostographie plate X (10), figure VIII (8 a-h) at upper right]; line drawings of Hymenachne sp.; [https://www.biodiversitylibrary.org/page/394127#page/274/mode/1up figure captions on caption page 8]

|synonyms =

  • Dallwatsonia B.K.Simon
  • Panicum sect. Hymenachnae (P.Beauv.) Hack.

|synonyms_ref = [http://www.tropicos.org/Name/40029316 Tropicos, Hymenachne P. Beauv.]

}}

Hymenachne, synonym Dallwatsonia, is a genus of widespread wetland plants in the grass family Poaceae. They are commonly known as marsh grasses.[https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=41777 Hymenachne.] Integrated Taxonomic Information System (ITIS). They are distributed in tropical and subtropical regions of Asia, the Americas, and the Pacific Islands.Clarkson, J. R., et al. (2011). [http://rbgsyd.nsw.gov.au/__data/assets/pdf_file/0003/109290/Tel131-2105Cla.pdf A report of hybridisation in Hymenachne (Poaceae, Panicoideae) with description of Hymenachne × calamitosa, a new species of hybrid origin from tropical Australia.] {{Webarchive|url=https://web.archive.org/web/20130925183616/http://rbgsyd.nsw.gov.au/__data/assets/pdf_file/0003/109290/Tel131-2105Cla.pdf |date=2013-09-25 }} Telopea 13(1-2), 105-14. A species from the Americas, H. amplexicaulis, is well known in other parts of the world as an introduced and invasive species.{{GRIN | Hymenachne amplexicaulis | 316039 | accessdate = 21 January 2018}}

Description

Hymenachne species are aquatic plants frequently found in marshes and other wet habitats. Their stems may be spongy with aerenchyma tissue. The longest stems can reach {{cvt|4|m|ft|0}}. They are perennial, sometimes with rhizomes. The leaves are linear or lance-shaped.[http://www.kew.org/data/grasses-db/www/gen00306.htm Hymenachne.] Grassbase - The World Online Grass Flora. The inflorescence is usually a cylindrical, spike-shaped panicle, rarely with branches.

Taxonomy

The genus Hymenachne was first described by Palisot de Beauvois in 1812.{{IPNI|taxon=Hymenachne |authority=P.Beauv..|id=18255-1|access-date=2024-11-24|mode=cs1}} Hymenachne is similar to the genus Sacciolepis, first described in 1901. Both were formerly considered part of Panicum.[http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=116069 Hymenachne.] Flora of China. Many species placed in Hymenachne have previously been placed in Sacciolepis.

In 1992, {{interlanguage link|Bryan Kenneth Simon|es}} described a new genus Dallwatsonia for a single new Australian species he called Dallwatsonia felliana. The genus was named for the Australian botanists Michael Dallwitz and Leslie Watson.{{Cite journal |last1=Simon |first1=Brian K. |date=1992 |title=Studies in Australian Grasses 6. Alexfloydia, Cliffordiochloa and Dallwatsonia, three new panicoid grass genera from Eastern Australia |journal=Austrobaileya |volume=3 |issue=4 |pages=669–681 |doi=10.5962/p.365996 |url=https://www.biodiversitylibrary.org/item/322721#page/106 |access-date=2024-11-24 |doi-access=free }} In 2014, ten further species were transferred from Panicum to Dallwatsonia by José Ramón Grande Allende, who noted that Dallwatsonia was closely related to Hymenachne, but could be distinguished by hollow rather than filled culms.{{Cite journal |last1=Grande Allende |first1=J.R. |date=2014 |title=Novitates Agrostologicae, IV. Additional segregates from Panicum incertae sedis |journal=Phytoneuron |issue=2014–22 |pages=1–6 |url=https://www.phytoneuron.net/2014Phytoneuron/22PhytoN-Panicumsegregates.pdf |access-date=2024-11-24 }} However, a molecular phylogenetic study published in 2014 supported the synonymy of Dallwatsonia and Hymenachne,{{Cite journal |last1=Acosta |first1=J.M. |last2=Scataglini |first2=M.A. |last3=Reinheimer |first3=R. |last4=Zuloaga |first4=F.O. |date=2014 |title=A phylogenetic study of subtribe Otachyriinae (Poaceae, Panicoideae, Paspaleae) |journal=Plant Systematics and Evolution |volume=300 |issue=10 |pages=2155–2166 |doi=10.1007/s00606-014-1034-8 |bibcode=2014PSyEv.300.2155A |name-list-style=amp |hdl=11336/18975 |hdl-access=free }} a conclusion also supported in a 2019 study.{{Citation |last1=Acosta |first1=Juan M. |last2=Zuloaga |first2=Fernando O. |last3=Reinheimer |first3=Renata |date=2019 |title=Nuclear phylogeny and hypothesized allopolyploidization events in the Subtribe Otachyriinae (Paspaleae, Poaceae) |journal=Systematics and Biodiversity |volume=17 |issue=3 |pages=277–294 |doi=10.1080/14772000.2019.1572035 |bibcode=2019SyBio..17..277A |name-list-style=amp |hdl=11336/116214 |hdl-access=free }} {{As of|2024|11}}, Plants of the World Online accepted Dallwatsonia as a synonym of Hymenachne.

=Species=

{{As of|2024|11}}, the following species were accepted:{{Cite POWO|title=Hymenachne P.Beauv..|id=18255-1|access-date=2024-11-24|mode=cs1}}[https://www.ars-grin.gov/cgi-bin/npgs/html/splist.pl?5927 GRIN Species Records of Hymenachne.] Germplasm Resources Information Network (GRIN)

; Formerly included{{Cite web |title=Search for 'Hymenachne' |website=Plants of the World Online |publisher=Royal Botanic Gardens, Kew |url=https://powo.science.kew.org/results?q=Hymenachne |access-date=2024-11-24}}

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References

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Category:Paspaleae

Category:Poaceae genera