Cymbidium dayanum Rchb.f 1869 SECTION Himantophyllum Schlechter 1924
Flower Closeup Photos by © Eric Hunt and his Orchid Species Photo Website
To 
Common Name Day's Cymbidium [English Orchid Grower 1800's] - In Japan Hetsuka-ran - In China Dong Feng Lan
Flower Size 1.6 to 2" [4 to 5 cm]
This medium sized, cold to warm growing epiphytic or terrestrial species occurs low down on tree trunks and can be found in Assam India, eastern Himalayas, Sikkim, Thailand, Cambodia, China, Vietnam , Borneo, Malaysia, the Philippines, Sulawesi, Sumatra, Taiwan, Ryukyu Islands and Japan, in evergreen lowland forests at elevations of 300 to 1800 meters, with indistinct, strongly compressed-ellipsoid pseudobulbs enveloped by scarious, persistent leaf bases and cataphylls and carrying 5 to 8, disitichous, narrow-linear, dark green, slightly leathery, pale green, acute to acuminate, sessile [no petiole] leaves with the articulation 1.2 to 2.4" away from the base that blooms in the summer and fall on a basal, erect to pendant, several [5 to 15] flowered, 9" [22.5 cm] long, racemose scape subtended with pink veined sheaths and triangular, acute, purplish floral bracts and carrying mostly non-fragrant flowers, and needs even year round conditions.
Synonyms Cymbidium acutum Ridl. 1896; Cymbidium alborubens Makino 1902; Cymbidium angustifolium Ames & C.Schweinf. 1920; Cymbidium dayanum subsp. leachianum (Rchb.f.) S.S.Ying 1989; Cymbidium dayanum var. austrojaponicum Tuyama 1941; Cymbidium eburneum var. austrojaponicum (Tuyama) M.Hiroe 1971; Cymbidium eburneum Lindley var dayanum Hkr. f. 1891; Cymbidium leachianum Rchb.f. 1878; Cymbidium poilanei Gagnep. 1931; Cymbidium pulcherrimum Sander 1891; Cymbidium simonsianum King & Pantl. 1895; Cymbidium sutepense Rolfe ex Downie 1925
References W3 Tropicos, Kew Monocot list , IPNI ;
The Orchids of Sikkim-Himalaya Part 1 King & Pantling 1898 as C simonsianum drawing fide; AOS Bulletin Vol 28 No 11 1959 photo; The Orchids of Thailand Seidenfaden & Smitinand 1959; The Orchids of Thailand Seidenfaden & Smitinand 1959 as C sutupense drawing; Orchids of Southern Ryukyu Islands Garay & Sweet 1974; AOS Bulletin Vol 50 No 5 1981 photo; AOS Bulletin Vol 50 No 5 1981 photo as C simonsianum; Orchid Digest Vol 48 No 3 1984 as C acutum photo fide; Orchid Digest Vol 48 No 3 1984 photo fide; Orchid Digest Vol 48 No 3 1984 as C angustifolium; Orchidiana Philipiniana Vol 1 Valmayor 1984; The Orchids of Penninsular Malaysia and Singapore Seidenfaden & Wood 1992 drawing fide; The Plants of Mount Kinabalu Vol 2 Orchids Wood Beaman & Beaman 1993 photo fide; A Checklist of the Orchids of Borneo Wood & Cribb 1994; Orchids Australia Vol 10 No 5 1998 photo as C simmonsissimum; Native Orchids of China in Colour Singchi, Zhanhuo and Yibo 1999 photo fide; Orchids of Sumatra Comber 2001 photo ok; Orchids of Sarawak Beeman & Wood 2001 photo fide; The Orchids of the Philippines Cootes 2001 photo fide; Orchids of Bhutan Pearce & Cribb 2002; Lindleyana Vol 17 No 1 2002; Flora Malesiana Orchids of the Philippines Vol I Agoo, Shuiteman and de Vogel 2003; AOS Bulletin Vol 73 No 10 2004 photo; AOS Bulletin Vol 74 No 12 2005 photo; The Genus Cymbidium Du Puy & Cribb 2007 photo/drawing fide; Orchids of India A Glimpse Misra 2007; A Field Guide to the Orchids of China Singchi, Zhongjian, Yibo, Xiaohua and Zhanhuo 2009 photo fide; Flora of China Vol 25 Zhengyi, Raven & Deyuan 2009; 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 Orchids of Mount Kinabalu Vol 2 Wood, Beaman, Lamb, Chu Lun and Beaman 2011 photo fide
Cymbidium dayanum var. albiflorum S.S. Ying 1995
A white color variety of the previous species.
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