480 ME. H. N. RIDLEY ON THE 



the rostellum erect and horn-shaped. The ovary is long, almost 

 cylindrical, and slightly carved, with six low ribs running its whole 

 course. The anther and pollinia I have not seen. The whole 

 plant dries black. The old leaf-sheaths of the lower leaves break 

 up into fibres which cover the stem. 



§ Euangrceca. 

 ANGB.scr/M ebtteneum, Thouars, Orch. lies Afriq. t. 65 ; 

 Rich. Orch. Maur. t. 71; Lindley, Gen. and Spec. Orch. PI. p. 245 ; 

 Beichenbachfil.in Waif. Ann. v. p. 904; S. Moore, in Flor. Maur. 

 and Seych. p. 356; Bot. Mag. t. 5170 ; Lindley, Paxt. Fl. Gard. 

 vol. i. pp. 25, 26 (xylogr.). — Limodorum eburneum, Bory, Voy. i. 

 p. 359, 1. 19 ; Willd. Sp. PI. iv. p. 125.— A. virens, Lindley, Bot. 

 Beg. 1847, sub t. 19; Paxt. Fl. Gard. vol. i. p. 25, figs. 9, 10. 



Madagascar, Forbes {fide Lindley) ; also in Ambongo Island, 

 Perville do. 148 in Herb. Lindley. Seychelles, Perceval Wright in 

 Herb. Keio. Bourbon, Thouars. Comoro Islands, Johanna, Kirk. 

 This plant and the two following are very closely allied, and 

 indeed A. eburneum and superbum were reduced by Lindley, in 

 Paxton's Mag., to one species. The flowers, however, of ebur- 

 neum are somewhat smaller, and the cordate lip is so constant 

 that it seems better at present to keep them distinct. In A. 

 superbum the lip is pure white, and the carina shorter and broader, 

 the petals and sepals duller green, and the whole flower more 

 fleshy. 



The variety virens {A. virens, Lindley) only differs from typical 

 eburneum hy being somewhat greenish in the middle of the lip. 



A. supebbum, Thouars, Orch. IlesAfriq.it. 62, 63, 64 ; Lindley, 

 Gen. and Sp. Orch. PI. p. 245.— A. eburneum, Lindley, Paxt. Mag. 

 1849, xvi. p. 90 ; Bot. Beg. xviii. pi. 1522 ; Rook. Bot. Mag. 

 t. 4761 (non Thouars). 



Madagascar only, Thouars ! in Herb. Brit. Mus. ; inter 

 Tamatave and Antananarivo, Meller in Herb. Few. 



This species is distinguished from A. eburneum by its broader 

 and more rhombiform lip, with a shorter and somewhat broader 

 cusp, thicker and blunter spur, and shorter, broader, and blunter 

 sepals and petals. 



A. Bbongniartiatutm, Beichenbach fil. Pescatorea, i. p. 16; 

 Walp. Ann. vi. p. 904. 

 Nossibe, Anliiabe, May 1879, Ilildcbrandt no. 2990. Also 



