Angraecum darainense P.J.Cribb & Nusbaumer

in Candollea 67: 270 (2012).

Répartition

Madagascar.

Floraison : J___________. Altitude de 520 à 570 m.

Description sommaire

Plante épiphyte. Taille de 0 à 22 cm. Bractées ovales, triangulaires. Fleur unique, blanche. Eperon de 80 à 100 mm, cylindrique. Sépale dorsal concave, lancéolé, de 0-9 × 2-3 mm. Sépales latéraux lancéolés, oblongs, de 10-11 × 0-3 mm. Pétales lancéolés, de 8-9 × 2-3 mm. Labelle concave, lancéolé.

Commentaires

Notes. – Angraecum darainense, described here, is allied to A. melanostictum Schltr. (sect. Pseudojumellea Schltr.), a species described from the Marojejy Massif, 140 km to the south of Daraina. The new species differs in having a flower with a longer spur, 8-10 cm long, more densely arranged leaves on the longer stems, unspotted leaf sheaths, and a much shorter and narrower leaf blade.Habitat and ecology. – Angraecum darainense was observed close to the ground in evergreen rainforest on large granitic rocks between 520 and 570 m elevation. It grows in forests with canopies reaching 10 to 14 m, with emergent trees reaching 16 m, with two sparse shrub strata at 3 to 4.5 and at 7 to 8 m high, and a very sparse suffrutescent stratum less than 1 m high.The most frequent species recorded together with Angraecum darainense in vegetation surveys are, in decreasing abundance: Cynometra commersoniana (DC.) Baill.,Treculia africana subsp. madagascarica (N. E. Br.) C. C. Berg, one unidentified species of Dypsis Mart., Ravenala madagascariensis Adans. and Scleria boivinii Ste.