Account
What the sources say about this taxon, as written.
distribution · 
Plazi
Distribution :— Vietnam ( Phu Yen Province : Song Hinh District). Southeast China ( Hong Kong ). Conservation status in Vietnam :—In Vietnam, Habenaria coultousii is known from a single location, where it is locally common, with numerous flowering individuals observed in a small forest area (along a trail several hundred meters long). Pending comprehensive field studies in this area, we estimate the national conservation status of the species as Data Deficient (DD) according to the criteria proposed by the IUCN Standards and Petitions Committee (2023) . Notes :— Habenaria coultousii is reported here as a new record for the flora of Vietnam . This is a rather unexpected discovery, since the species was earlier known as a narrow endemic of Hong Kong . The population found in southern Vietnam morphologically fits well the protologue and the type material, leaving no doubts in the identification. This finding expands the known distribution area of the species by more than 1500 km in the SW direction, with a considerable disjunction. Surprisingly, H. coultousii looks close in floral morphology to H. amplifolia Cheeseman (1903: 298) endemic to Rarotonga Island ( Cook Islands ). Habenaria amplifolia is distributed more than 11000 км ESE of the known locations of H. coultousii . According to the type (K000827058 photo!), description, and illustrations of H. amplifolia ( Cribb & Whistler 2011: 129 , fig. 27, 67), it differs from H. coultousii in larger size of plant, larger flowers and longer spur, and especially in much larger leaves 18–29 cm long, 3.8–7 cm wide (vs. leaves 2.5–5.2 cm long, 0.8–1.2 cm wide). Studied specimens :— VIETNAM . Phu Yen Province : Song Hinh District , Song Hinh Municipality , Song Hinh Protected Forest , forest on slope, elevation of 390 m , 12°47’58’’N 109°00’47’’E , 10 January 2021 , M . S . Nuraliev, D. F .Lyskov, A . N .Kuznetsov, S . P .Kuznetsova NUR 3083 ( LE01077932 https://en.herbariumle.ru/?t=occ&id=124834, photos LE01122893 https://en.herbariumle.ru/?t=occ&id=99521) .