Ponerorchis chusua (D.Don) Soó, Acta Bot. Acad. Sci. Hung.

Ormerod, Paul, Kurzweil, Hubert & Watthana, Santi, 2021, Annotated List of Orchidaceae for Myanmar, Phytotaxa 481 (1), pp. 1-262 : 212

Ponerorchis chusua (D.Don) Soó, Acta Bot. Acad. Sci. Hung. 12: 352, 1966

Basionym: Orchis chusua D.Don, Prodr. Fl. Nepal.: 23, 1825.

Homotypic synonyms: Gymnadenia chusua (D.Don) Lindl. , Gen . Sp. Orchid. Pl.: 280, 1835. Habenaria chusua (D.Don) Benth., J. Linn. Soc., Bot. 18: 355, 1881.

Heterotypic synonyms: Chusua donii Nevski in V.L.Komarov (ed.), Fl. URSS 4: 671, 1935.

? Ponerorchis nana (King & Pantl.) Soó, Acta Bot. Acad. Sci. Hung. 12: 353, 1966.

Specimens examined:— KACHIN. Putao District : 3660−3960 m, 7 Jul 1926, Kingdon-Ward 7060 ( K) ; same loc., 3350−3660 m, 13 Oct 1926, Kingdon-Ward 7578 ( K) ; same loc., 3960 m and above, 22 Jun 1931, Kingdon-Ward 9679 ( BM) ; same loc., 3665 m, 21 Jul 1931, Kingdon-Ward 9835 ( BM) ; same loc., 2745 m, 18 Aug 1937, Kingdon-Ward 12967 ( BM) ; same loc., 2745 m, 18 Aug 1937, Kingdon-Ward [number not recorded] ( BM) ; same loc., 3050−3350 m, 10 Sep 1937, Kingdon-Ward 13254 ( BM) ; northeastern part: 2745−3050 m, 1 Aug 1919, Kingdon-Ward 3448 ( E) ; Myitkyina District : 3200 m, 20 Jul 1919, Farrer 1119 ( E) ; same loc., 13 Jul 1938, Naw Mu Pa 17425 ( AMES, K) .

Distribution:— Northern India, the Himalayas, northern Myanmar, China, Japan, Korea, the Russian Far East and Siberia.

Notes:— The unnumbered Kingdon-Ward collection from Putao District was previously referred by PO to P. nana , a taxon that probably is not justified, considering the wide variability of P. chusua .