Cleisostoma arietinum

Cleisostoma arietinum (Rchb.f.) Garay, Bot. Mus. Leafl. 23: 169 1972. (syn. Echioglossum arietinum (Rchb.f.) Szlach.; Saccolabium kunstleri (King & Pantl.) Ridl.; Sarcanthus arietinus Rchb.f.; Sarcanthus kunstleri King & Pantl.; Sarcanthus recurvus Rolfe ex Downie);

Assam to Peninsula Malaysia: Assam, Cambodia, Laos, Malaya, Myanmar, Thailand, Vietnam as per POWO;
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ORCHIDACEAE Juss. Fortnight: Cleisostoma arietinum (Rchb.f.) Garay from Hong, Kong, PKS-188 : Attachments (3). 3 posts by 3 authors.
Cleisostoma arietinum (Rchb.f.) Garay, Bot. Mus. Leafl. 23: 169 (1972).

Synonyms:
Sarcanthus arietinus Rchb.f., Gard. Chron. 1869: 416 (1869).
Echioglossum arietinum (Rchb.f.) Szlach., Ann. Bot. Fenn. 40: 68 (2003).
Sarcanthus kunstleri King & Pantl., J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 66: 594 (1897).
Saccolabium kunstleri (King & Pantl.) Ridl., Mat. Fl. Malay. Penins. 1: 163 (1907).
Sarcanthus recurvus Rolfe ex Downie, Bull. Misc. Inform. Kew 1925: 404 (1925).
Distribution: Assam to Pen. Malaysia

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Thanks for these beautiful pics

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References:
POWO  The Plant List