Dendrobium primulinum Lindley 1858 SECTION Dendrobium
Another Flower with yellow lip
Photos by © Lourens Grobler
Photo courtesy of Andy's Orchids, Copyright © 2002 All rights reserved
To 
Common Name The Primrose Yellow Dendrobium - In Thailand Ueang Sai Nam Phung
Flower Size to 2 1/2" [to 6.25 cm]
Found in Assam, eastern Himalayas, Nepal, western Himalayas, Andaman Islands, Myanmar, Thailand, Laos, Yunnan China and Vietnam as a large sized, warm growing, pendant epiphyte found on deciduous trees at elevations of 500 to 1000 meters where they need direct sunlight for at least 3 hours a day. This plant has clustered, ascending, prostrate or pendulous, terete, sulcate stems covered in white sheaths and blooms in the winter through summer on a short inflorescence with minute bracts and 1 to 2, fragrant flowers that arise from nodes along the leafless cane and needs lots of water and fertilizer after the new growth begins, lasting through late September when it is time to stop water and fertilizer until the new growths begin again.
Some references cite this species as a synonym of D polyanthum but I have left them separate at this time.
Synonyms Callista primulina (Lindl.) Kuntze 1891; Dendrobium nobile var pallidiflorum Hooker 1856
References W3 Tropicos, Kew Monocot list , IPNI ; Orchids of Burma Grant 1895/1995; The Orchids of North-Western Himalaya Vol IX Part II Duthie 1906 drawing fide; Orchidaceae Monandre-Dendrobiinae Fr. Kraenzlin 1910 drawing good; Die Orchideen Schlechter 1915; Atlas des Orchidees Cultivees Constantin 1920 as Eudendrobium primulinum drawing fide; Die Orchideen 2 Auflage Schlechter 1927; Flora of Malaya Vol 1 Orchids Holttum 1953; The Orchids of Thailand Seidenfaden & Smitinand 1960; The Orchids of Thailand Seidenfaden & Smitinand 1965 corrections; Encyclopedia of Cultivated Orchids Hawkes 1965; AOS Bulletin Vol 38 No 3 1969 photo fide; AOS Bulletin Vol 44 #9 1975 photo fide; Beautiful Indian Orchids and How to grow them Ghose 1968; Beautiful Thai Orchid Species Kamemoto & Sagarik 1975 photo fide; Indian Orchids, A guide to Identification and Culture Vol II Pradhan 1979 photo fide; Die Orchideen lieferung 11/12 Schlechter/Brieger 1981; AOS Bulletin Vol 54 No 3 1985; Opera Botanica #83 Orchid Genera in Thailand XII Dendrobium Sw. Seidenfaden 1985 drawing/photo fide; Orchids of Northwest Himalaya Deva & Naithani 1986 drawing fide; Orchids of Kumaun Himalayas Pangtey, Samant and Rawat 1991; Thai Orchid Species Rakpaibulsombay 1992 photo fide; The Manual Of Cultivated Orchid Species Bechtel, Cribb & Laurent 1992 photo fide; Identification of the Orchids [Orchidaceae Juss.] Vietnam Averyanov 1994; Manual of Orchids Stewart 1995; Orchid Species Culture; Dendrobium Bakers 1996; Wild Orchids of China Tsi, Chen Mori 1997 photo fide; Native Orchids of China in Colour Singchi, Zhanhuo and Yibo 1999 photo fide; Dendrobium and its Relatives Lavarack, Harris and Stocker 2000 photo fide; A Field Guide to the Wild Orchids of Thailand Vaddhanaphuti 2001 photo fide; The Orchids of Bhutan Pearce & Cribb 2002; Australian Orchid Review Vol 68 No 5 2003 photo; A field Guide to the Wild Orchids of Thailand Vaddhanaphuti 2005 photo fide; Flora's Orchids Nash & La Croix 2005 photo fide; The Dendrobiums H. P. Wood 2006; AOS Bulletin Vol 76 No 10 2007 as D polyanthum photo fide; Wild Orchids in Myanamar Vol 3 Tanaka 2007 photo fide; Orchids of India A Glimpse Misra 2007; A Field Guide to the Orchids of China Singchi, Zhongjian, Yibo, Xiaohua and Zhanhuo 2009 photo ok; Orchid Digest Vol 74 #4 2010 photo/drawing fide; Wild Orchids of Myanmar Hyan Tun [Mr Myanmar] 2014 Photo fide; AOS Bulletin Vol 85 #11 2016 as D polyanthum photo fide;
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Dendrobium primulinum Lindley 1858 var alba
Photo courtesy of CJ Maciejeski
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