Gastrorchis Thouars, Nouv. Bull. Sci. Soc. Philom. Paris 10: 317 (1809).
Gastrorkis Schltr., Repert. Spec. Nov. Regni Veg. Beih. 33: 166 (1924), orth. var.
Plants with the appearance of Calanthe or Phaius, but much larger, with very large leaves and very brilliantly colored flowers of various tints; flowers cup-shaped, sub-spherical, with 3 more or less projecting angles. Sepals oval, all free. Labellum free, flat and widely auriculate; labellum provided with a large V shaped callus or crest, keels and often a large number of hairs behind; spur nearly absent. Column 15 mm long. Anther glabrous or hearing several hairs, provided apically with a truncate appendage: staminodes only slightly present as enlarged areas of the clinandrium margins; pollina 8 in 2 groups of 4 (2 longer and 2 shorter in each set), each group joined by a single cauda, which are separated, long (I .5 mm) and thick. Rostellum entire, in the form of a flap. truncate apically.

Gastrorchis francoisii Schltr. Madagascar.
Gastrorchis geffrayi (Bosser) Senghas N. Madagascar.
Gastrorchis humblotii (Rchb.f.) Schltr. Madagascar.
Gastrorchis humblotii var. humblotii. Madagascar.
Gastrorchis humblotii var. rubra (Bosser) Bosser & P.J.Cribb C. Madagascar.
Gastrorchis humblotii var. schlechteri (H.Perrier) Senghas ex Bosser & P.J.Cribba (Ursch & Toill.-Gen. ex Bosser) Senghas N. Madagascar.
Gastrorchis lutea (Ursch & Toill.-Gen. ex Bosser) Senghas NE. Madagascar.
Gastrorchis peyrotii (Bosser) Senghas NE. Madagascar.
Gastrorchis pulchra Humbert & H.Perrier Madagascar.
Gastrorchis pulchra var. perrieri (Bosser) Bosser & P.J.Cribb Madagascar.
Gastrorchis pulchra var. pulchra.  
Gastrorchis simulans (Rolfe) Schltr.  NE. Madagascar.
Gastrorchis tuberculosa (Thouars) Schltr.  NE. Madagascar.


World Checklist of Monocotyledons. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; accessed1/16/2010
Bibliography and References:
Masuda Y, Faliniaina L, Kondo K. 2006 Phylogenetic analysis of Malagasy Gastrorchis and Phaius (Orchidaceae) based on internal transcribed spacer (ITS) sequence. J. Phytogeogr. Taxon. 54. (1): 15-20.
Senghas K. 1997 Die Gattung Gastrorchis, mit einer neuen Art, Gastrorchis steinhardtiana. J. Orchideenfreund 4. (3): 130-134 (1997)