Pachystoma Blume
  • Blume, Bijdr.: 376 (1825)

This is a synonym of Collabieae Pfitzer

General Description

Terrestrial herbs with a distinct dormant period. Rhizome cylindrical. Pseudobulb fleshy, cylindrical or tuber-like with distinct fertile and vegetative shoots. Leaves 1–2, linear, erect, chartaceous, plicate-venose, subtended by a few sterile sheaths. Inflorescence axis leafless, erect, bearing many brown sheaths along length, racemose; floral bracts suberect, lanceolate, persistent. Flowers hairy, subnutant. Sepals subequal, not spreading widely, pubescent on both surfaces, dorsal sepal free, lateral sepals with oblique bases surrounding the saccate lip-base to form a blunt mentum. Petals free, linear, narrower than sepals, pubescent on both surfaces. Labellum attached to the apex of the column foot, fleshy, porrect, trilobed in apical half, subgibbous or saccate at base but lacking a spur, disc papillose, lateral lobes erect, midlobe recurved at blunt apex, callus of several papillose or verrucose linear ridges from base to apex of the labellum. Column clavate, incurved and winged at apex, pubescent; anther terminal, pubescent, pollinia eight, clavate; stigma transversely reniform-elliptic or dumbbell-shaped; rostellum obtuse. Ovary hairy. Capsule oblong, rostrate, ridged. (PC).


Plants occur in grassy places on hills and mountains, in grassy deciduous forest, rocky areas, dry swampy grassland, and open river plains up to 1600 m. (PC).


A small genus of about 20 species, widespread in tropical Asia and the Malay Archipelago, northern Australia, and New Caledonia. (PC).


No uses are recorded for Pachystoma. (AP).

Distribution Map

  • Native distribution
Found in
  • Asia-Temperate China China South-Central
  • China Southeast
  • Hainan
  • Eastern Asia Taiwan
  • Asia-Tropical Indian Subcontinent Assam
  • Bangladesh
  • East Himalaya
  • India
  • Nepal
  • West Himalaya
  • Indo-China Andaman Is.
  • Cambodia
  • Laos
  • Myanmar
  • Nicobar Is.
  • Thailand
  • Vietnam
  • Malesia Borneo
  • Jawa
  • Lesser Sunda Is.
  • Malaya
  • Maluku
  • Philippines
  • Sulawesi
  • Sumatera
  • Papuasia New Guinea
  • Australasia Australia Northern Territory
  • Queensland
  • Pacific Southwestern Pacific New Caledonia


 Information From

WCS higher taxonomy
  • A All Rights Reserved
World Checklist of Selected Plant Families
WCSP 2014. 'World Checklist of Selected Plant Families. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; Retrieved 2011 onwards
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