Benthamia rostrata Schltr., Repert. Spec. Nov. Regni Veg. Beih. 33: 33 (1924).
Synonyms:
Platanthera madagascariensis Schltr., Beih. Bot. Centralbl. 34(2): 299 (1916), nom. illeg.
Description:
Plants with the aspects of B. perularioides. Differing by the fact it has 2 radical leaves, the rachis is slightly unilateral the divisions of the flower are slightly longer (4 mm), the labellum rhomboidal and heavily dilate medially and subtrilobed, the spar being filiform and longer (4.5 mm) and the anther apiculate and shorter. The flowers are green or greenish-yellow.
Habitat:
Rock piles and praries, from 2000 m, alt.
Flowering:
February-March.
Distribution:
Madagascar
References:
Flora of Madagascar: vascular plants: 49th family, Orchids / by H. Perrier de La Bathie; published under the auspices of the government of Madagascar and under the direction of H. Humbert; English revision and translation by Steven D. Beckman
Images:
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Habitat/In situ 
benthamia rostrata 
Photograph ©Gilles
Grunenwald. Image used
with kind permission.