Habenaria dentata [Sw.]Schlechter 1919 SECTION Macroceratitis Kraenzl
Photo by Peter O'Byrne
Photo by Wilford Neptune.
Plant and flowers in situ in Thailand
Photo by David Kuehn
To 
LATE 
Common Name The Toothed Habenaria - in Ryukyu Islands - Dai-Sagi-So - Seitaka-sagi-so - In China E Mao Yu Feng Hua - In Thailand Nang ua noi, Wan khao nieo, Ueang khao tok
Flower Size 1.2 to 1.6" [3 to 4 cm]
Found in the Assam, eastern Himalayas, Nepal, western Himalayas, Bhutan, Myanmar, Thailand, Malaysia, Cambodia, Laos, Vietnam, the Philippines, Ryukyu Islands, China, Taiwan and Japan in open secondary grasslands, in semi-deciduous and deciduous dry lowland forests and savana-like woodlands at elevations of 600 meters to around 1800 meters as a medium to large sized, warm to cool growing terrestrial orchid with a leafy stem carrying oblong-elliptic to ovate-elliptic, acute or obtuse leaves that blooms in the late summer and fall on a terminal, erect, 20" to 24" [50 to 60 cm] long, several flowered [15], racemose inflorescence with linear-lanceolate, acuminate floral bracts that are longer than the ovary. What a gorgeous flower!
Synonyms; Habenaria dentata var. tohoensis (Hayata) S.S.Ying 1977; Habenaria geniculata D.Don 1825; Habenaria miersiana Champ. ex Benth. 1855; Habenaria sieboldiana Miq. 1866; Habenaria tohoensis Hayata 1914; *Orchis dentata Sw. 1800; Orchis geniculata Buch.-Ham. ex D.Don 1825; Plantaginorchis dentata (Sw.) Szlach 2004; Plantaginorchis finetiana (Schltr.) Szlach. 2004; Platanthera dentata Lindl. 1840; Platanthera geniculata (D.Don) Lindl. in N.Wallich 1832
References W3 Tropicos, Kew Monocot list , IPNI ; A Century of Indian Orchids Vol 5 Hooker 1895 as H geniculata drawing fide; Orchids of Burma Grant 1895/1995 as H geniculata; The Orchids of Sikkim-Himalaya Part 1 King & Pantling 1898 as H geniculata drawing good; Flore Generale de Indo-Chine Volume 6 Gagnepain 1934 as Habenaria geniculata; AOS Bulletin Vol 28 No 11 1959 as H geniculata photo good; The Orchids of Thailand Seidenfaden & Smitinand 1959 drawing fide; The Orchids of Thailand Seidenfaden & Smitinand 1959 as H sp fig 30 drawing ok; The Orchids of Thailand Seidenfaden & Smitinand 1964 corrections; Bulletin du Museum National d'Histoire Naturelle % No 71 Seidenfaden 1972; Orchids of Southern Ryukyu Islands Garay & Sweet 1974 drawing fide; Contributions to a Revision of the Orchid Flora of Cambodia, Laos and Vietnam Seidenfaden 1975; Indian Orchids A Field Guide to Identification and Culture Vol 1 Pradhan 1976 drawing fide; The Genera of Orchidceae in Hing Kong Hu 1977 drawing fide; Dansk Botanisk Arkiv Bind 31 #3 Orchid Genera in Thailand V Orchidoideae Seidenfaden 1977 drawing fide; Orchidiana Philippiniana Vol 1 Valmayor 1984; The Orchids of Penninsular Malaysia and Singapore Wood & Seidenfaden 1992 drawing/photo fide; Thai Orchid Species Rakpaibulsombat 1992 photo fide; Orchids Zenghong, Qital, Zhizhou, Kalyong and Heng 1993 photo fide; Identification of the Orchids [Orchidaceae Juss.] Vietnam Averyanov 1994; Orchids of Nagaland Deorani & Naithani 1995 drawing ok; The Wild Orchids of China Tsi, Chen & Mori 1997 photo fide; Native Orchids of China in Colour Singchi, Zhanhuo and Yibo 1999 photo fide; Lindleyana Vol 15 No 4 2000; Flora Malesiana Orchids of the Philippines Vol I Agoo, Shuiteman and de Vogel 2003; Orchids of Bhutan Pearce & Cribb 2002; Wild Orchids in Myanamar Vol 2 Tanaka 2004; A field Guide to the Wild Orchids of Thailand Vaddhanaphuti 2005 photo fide; Orchids of India A Glimpse Misra 2007; Native Orchids From Gaoligongshan Mountains, China Xiaohua, Xiaodong and Xiaochun 2009 photo fide; A Field Guide to the Orchids of China Singchi, Zhongjian, Yibo, Xiaohua and Zhanhuo 2009 photo ok; Flora of China Vol 25 Zhengyi, Raven & Deyuan 2009; Flora of China Vol 25 Illustrations Zhengyi, Raven & Deyuan 2010 drawing fide; Flora of China Vol 25 Zhengyi, Raven & Deyuan 2009; Philippine Native Orchid Species Cootes 2009 photo fide; Flora of China Vol 25 Illustrations Zhengyi, Raven & Deyuan 2010 drawing fide; The Atlas of Wild Orchids in Hainan Island, China Shenyan and Junmei 2010 photo fide; The Wild Orchids in Yunnan Xu Xiang Ye & Liu 2010 photos fide; Flora Of Thailand Orchidaceae Vol 12 Part 1 Pedersen, Kurzweil, Suddee & Cribb 2011 drawing/photo fide; The Wild Orchids of Hong Kong Barretto, Cribb and Gale 2011 drawing/photo fide; The Wild Orchids of Taiwan Lin & Wang 2014 photo fide; A Guide to the Orchids of Myanmar Kurzweil & Lwin 2014 photo fide; Wild Orchids of Myanmar Tun 2014 photo fide; AOS Bulletin Vol 85 #7 2016 photo fide; Terrestrial Orchids Swami 2016 photo fide; Handbook Orchids of Sikkim and Northeast India Pradhan 2016 photo fide; Checklist of Orchids of Penninsular Malaysia Ong, O'Byrne, Saw and Chung 2017; AOS Bulletin Vol 89 #1 2020 photo fide; Atlas of Native Orchids of China Vol 1 Jin Xiaohua, Li Jianwu and Ye Deping 2019 photo fide;
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