{{short description|Genus of plants}} {{Automatic taxobox |image = Dimorphorchis rossii (14362472022).jpg |image_caption = ''Dimorphorchis rossii'' |image2 = Dimorphorchis lowii (Renanthera lowii) - Curtis' 90 (Ser. 3 no. 20) pl. 5475 (1864).jpg |image2_caption = Botanical illustration of ''Dimorphorchis lowii'' |display_parents = 3 |taxon = Dimorphorchis |authority = Rolfe |synonyms = *''Arachnopapua'' R.Rice *''Lowianthus'' Becc. |synonyms_ref = <ref name = "POWO" /> |type_species = ''Dimorphorchis lowii'' (Benth. & Hook. f.) Rolfe<ref name = "Tropicos" /> }}
'''''Dimorphorchis''''' is a genus of flowering plants from the orchid family, Orchidaceae. It contains 9 species, which are native to Papua New Guinea, the Philippines, Indonesia, Malaysia, Solomon Islands, and Brunei.<ref name = "POWO">{{cite POWO |id=29278-1 |title=''Dimorphorchis'' Rolfe |accessdate=8 February 2023}}</ref> It is remarkable for its two flower morphs present on the same plant.<ref name = "Rolfe, 1919" />
== Description == [[File:Dimorphorchis lowii (cropped).png|left|thumb|267x267px|''D. rossii'' distal flower. At Sakuya Konohana Kan.]] ===Vegetative characteristics=== Its species are epiphytic, monopodial herbs with large, pendulous,<ref name = "Teoh & Teoh, 2021">Teoh, E. S., & Teoh, E. S. (2021). ''Dimorphorchis'' Rolfe. Orchid Species from Himalaya and Southeast Asia Vol. 1 (A-E), 465-470.</ref> spreading, or erect<ref name = "Pridgeon et al., 2014" /> up to 200 cm long stems.<ref name="Wood, 2005" /> The basal part of the stem bears roots.<ref name = "Pridgeon et al., 2014">Pridgeon, A. M., Cribb, P. J., Chase, M. W., & Rasmussen, F. N. (2014). Genera Orchidacearum volume 6: Epidendroideae (Part 3). pp. 172–175. OUP Oxford.</ref> The distichously arranged,<ref name = "Pridgeon et al., 2014" /><ref name = "Teoh & Teoh, 2021" /> coriaceous,<ref name = "Teoh & Teoh, 2021" /> linear<ref name = "Pridgeon et al., 2014" /> up to 70 cm long leaves<ref name="Wood, 2005" /> have an unequally bilobed to acute apex.<ref name = "Pridgeon et al., 2014" /> ===Generative characteristics=== The long,<ref name = "Zou et al., 2015" /> glabrous<ref name = "Pridgeon et al., 2014" /> or pubescent,<ref name = "Pridgeon et al., 2014" /><ref name = "Zou et al., 2015">Zou, L. H., Huang, J. X., Zhang, G. Q., Liu, Z. J., & Zhuang, X. Y. (2015). [https://www.sciencedirect.com/science/article/pii/S1055790315000445 A molecular phylogeny of Aeridinae (Orchidaceae: Epidendroideae) inferred from multiple nuclear and chloroplast regions.] Molecular phylogenetics and evolution, 85, 247-254.</ref> pendent or erect, racemose or paniculate,<ref name = "Pridgeon et al., 2014" /> up to 3 metres long inflorescences<ref name="Wood, 2005" /> bear dimorphic (heteranthous)<ref name = "Rolfe, 1919" /><ref name="Wood, 2005" /> or not dimorphic,<ref name = "Pridgeon et al., 2014" /> bisexual flowers.<ref name="Wood, 2005" /><ref name = "Hutton, 2011">Hutton, R. (2011). ''Dimorphorchis'' – Borneo beauties. The New Zealand Internet Orchid Review, 16, 26. http://www.orchidcouncil.org.nz/wp-content/uploads/2023/03/Issue-16-final.pdf</ref> The 2-3 flowers closest to the base of the inflorescence are strongly fragrant, slightly smaller, and of a different colour compared to the rest of the flowers, which are unscented and have wavy petals.<ref name="Wood, 2005" /> The four pollinia with an elliptic viscidium are grouped in two pairs.<ref name = "Pridgeon et al., 2014" /> It is unknown how the genus is pollinated.<ref name = "Pridgeon et al., 2014" /><ref name="Wood, 2005">{{Cite journal |last=Wood |first=Jeffrey |date=2005 |title=518. ''Dimorphorchis rossii'' var. ''graciliscapa'': Orchidaceae |url=https://www.jstor.org/stable/45066086 |journal=Curtis's Botanical Magazine |volume=22 |issue=1 |pages=42–46 |issn=1355-4905}}</ref>
==Taxonomy== It was published by Robert Allen Rolfe in 1919<ref name = "Rolfe, 1919">The Orchid review (Vol. 27, Issues 321–322, p. 149). (1893). Orchid Review ltd.]. https://www.biodiversitylibrary.org/page/37102243</ref><ref name = "IPNI">''Dimorphorchis'' Rolfe. (n.d.). International Plant Names Index. Retrieved December 2, 2024, from https://www.ipni.org/n/29278-1</ref> with ''Dimorphorchis lowii'' (Benth. & Hook. f.) Rolfe as the type species.<ref name = "Tropicos">Missouri Botanical Garden. (n.d.-d). ''Dimorphorchis'' Rolfe. Tropicos. Retrieved December 2, 2024, from http://legacy.tropicos.org/Name/40031513</ref> ===Species=== It has nine species:<ref name = "POWO" /> *''Dimorphorchis beccarii'' (Rchb.f.) Kocyan & Schuit. *''Dimorphorchis breviscapa'' (J.J.Sm.) Kocyan & Schuit. *''Dimorphorchis celebica'' (Schltr.) Ormerod *''Dimorphorchis graciliscapa'' (A.Lamb & Shim) P.J.Cribb *''Dimorphorchis lowii'' (Lindl.) Rolfe *''Dimorphorchis lyonii'' (Ames) Ormerod *''Dimorphorchis rohaniana'' (Rchb.f.) P.J.Cribb *''Dimorphorchis rossii'' Fowlie *''Dimorphorchis tenomensis'' (A.Lamb) P.J.Cribb ===Phylogenetic relationships=== Within the subtribe Aeridinae, it is the sistergroup to ''Thrixspermum''.<ref name = "Zou et al., 2015" />
==Etymology== The generic name ''Dimorphorchis'' references the characteristic two flower morphs preset within the same plant.<ref name = "Rolfe, 1919" />
==Ecology== ===Habitat=== It can grow as a lithophyte or epiphyte in rainforests.<ref name = "Ormerod, 2013">Ormerod, P. (2013). [https://books.google.de/books?id=-H18EAAAQBAJ&lpg=PA33&ots=96PuOKNCY4&dq=Dimorphorchis&lr&hl=de&pg=PA33#v=onepage&q&f=false A new, orange-flowered ''Dimorphorchis'' from Maluku, Indonesia.] Malesian Orchid Journal, 12, 33-37.</ref>
== References == {{Reflist}}
== External links == *{{Wikispecies-inline}}
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Category:Vandeae genera Category:Aeridinae
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