Porpax Lindl.
  • Lindl., Edwards's Bot. Reg. 31(Misc.): 62 (1845)

This is a synonym of Eriinae Benth.

General Description

Dwarf epiphytic or lithophytic herbs, forming mats on the substrate. Rhizome creeping. Pseudobulbs of one node, ovoidspherical, dorsiventrally compressed, covered by sheaths that disintegrate into a reticulate network, bearing one or two leaves at apex. Leaves usually two, appearing after or together with flowers at apex of pseudobulbs, coriaceous, spreading, narrowly elliptical, lanceolate or oblong-ovate, acute or obtuse, base tapering to a petiole, articulated at apex of pseudobulb. Inflorescence synanthous or proteranthous, terminal, from apex or base of pseudobulb, usually bearing only one flower; floral bracts conspicuous, covering ovary. Flower usually solitary, subcampanulate, not widely opening, brown or dull red-brown. Sepals similar, fused from base almost to tip, forming a tube-shaped flower entirely enclosing petals, column, and labellum. Dorsal sepal ovate. Lateral sepals obliquely ovate-falcate. Petals shorter than sepals, elliptical- to oblong-lanceolate. Labellum entire or indistinctly trilobed, recurved, V-shaped in transverse section. Column with a foot two times as long as column, curving; anther incumbent, pollinia eight, in two groups of four, clavate, laterally compressed; stigma concave, oval to almost circular; rostellum broad, truncate. (PC, YN).


Species are epiphytes on mossy twigs, branches, and tree trunks in tropical evergreen forests, especially hill and montane forests, and also lithophytic in moss by montane forest streams from 100–1900 m. (PC).


The 11 species of Porpax are collectively distributed mainly in tropical regions of Asia, from the Himalayas to India, Nepal, Bhutan, southern China, Laos, Thailand, peninsular Malaysia, and Sabah. (PC, YN).


Some species of Porpax are cultivated in specialist collections. (AP).

Distribution Map

  • Native distribution
Found in
  • Asia-Temperate China China South-Central
  • Asia-Tropical Indian Subcontinent Assam
  • East Himalaya
  • India
  • Nepal
  • Indo-China Andaman Is.
  • Cambodia
  • Laos
  • Myanmar
  • Thailand
  • Vietnam
  • Malesia Borneo
  • Malaya


 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; http://apps.kew.org/wcsp/ Retrieved 2011 onwards
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