ORCHIDS OF MADAGASCAR. 475 



The whole plant is 6 inches high, the longest leaves 2 inches 

 in length by f in breadth. I only know this from two coloured 

 drawings with details and notes. It must be closely allied to 

 P. luteola, Hook., a S. American plant. 



Other Madagascar species are : — 



Polystachyarosellata, Ridley in Journ. Linn. Soc. xx. 330. — 

 Ankafana, Deans Cowan in Herb. Brit. Mus. ; and P. multiflora, 

 Ridley, 1. c., from the same locality, collected both by Deans Cowan 

 and Hildebrandt (March 1881, no. 4220, in Herb. Brit. Mus.). 



P. Jussieuiana, Heicheniachjil. in Walters' 's Annates, vi. p. 640, 

 I cannot recognize, as the description is too imperfect for such a 

 difficult genus. 



Acampe. 



This genus consists of about a dozen species, of which the bulk 

 are natives of tropical Asia and China, one or two occurring in 

 Southern .Africa. The only Madagascar species yet known is A. 

 JRenschiana, Eeichenbach fij, Otia Hamburg, fasc. 2, p. 77, which 

 was discovered by Hildebrandt in Nossibe; no. 3392 of his col- 

 lection. 



Angrjecum. 



A large genus of about 60 known species, of which all but one 

 are natives of Africa and its adjoining islands, the remaining 

 one being found in China and Japan. The species differ very 

 greatly in the form and size of the flower, and in the cau dicle 

 and gland of the pollinium, and have been divided into genera 

 according to the number of the latter, with no very satisfac- 

 tory result, since the pollinia are frequently missing in her- 

 barium specimens, and moreover sometimes plants apparently 

 closely allied differ entirely in the structure of the pollinia. 



§ Macrura. 



A. sesquipedale, Thouars, Orel. lies Afriq. it. 66, 67; folio, 

 pi. i., ii. ; Hooker, in Bot. Mag. t. 5113; Lindley, Gard. Chron. 

 1857, p. 252 ; Flore des Serves, 1. 1413 ; Illustr. Horticole, vol. viii. 

 p. 77, t. 475; Gartenflora, t. 714.— Aeraiithus sesquipedalis, 

 Lindley, Gen. and Sp. Orch. PI. p. 214 ("omen nudum). 



Madagascar: Ankafana, apud saxa, Hildebrandt no. 30S3 ! 

 same locality, very common, Beans Cowan ! in Herb. Brit. Mus. ; 



