PHANEROGAMS— PROFESSOR BAYLEY BALFOUR. 315 



indeed is very closely allied, but is altogether a smaller and more delicate 

 species, with also a few technical differences. In Schimper's Abyssinian 

 herbarium (ed. Hohenacker), a specimen, n. 2310, is by Bentham (loc. cit.) 

 rightly separated from R. grandiflorum, under which name it has been sent out, 

 having smaller spikelets and shorter awns. In these characters it approaches 

 our plant, from which it principally differs in its larger stature and less puberu- 

 lent coating. Possibly it may prove to be the same plant as ours, but the 

 material is too poor for an identification at present. 



Our plant exhibits two forms. One I have taken as the type wherein the 

 second and third glumes have a small dorsal crest, and the sides slightly strigulose, 

 the other, which I have named as a variety, having these glumes thickly covered 

 with long white silky hairs, and the dorsal crest thick and large. 



9. TRAGUS. 



Tragus, Haller Stirp. Helv. ii. 203 ; Benth. et Hook. Gen. PI. iii. 1122. 



A monotypic genus widely dispersed in tropical and temperate regions of 

 both old and new world. 



T. racemosus, Desf. Flor. Atl. ii. 386; Doll, in Mart. Flor. Bras. ii. pt. ii. 

 t. 18. 



T. brevicaulis, Boiss. Diagn. i. 13, 44. 



Lappago raccmosa, Willd. Sp. i. 484; Kunth Enum. i. 170, and Revis Gram. ii. t. 120. 



Soeotra. Common. B.C.S. nn. 568, 570. 

 Distrib. Of the genus. 



10. IMPERATA. 



Imperata, Cyr. PI. Rar. Ic. ii. 26, t. 11; Benth. et Hook. Gen. PI. iii. 1125. 



A small genus of three or four species spread through the whole tropics. 



I. arundinacea, Cyr. PI. Rar. Ic. ii. 26, t. 11; Kunth Enum. i. 477; 

 Reichb. Ic. Flor. Germ. i. t. 55. 



Soeotra. Occasional. B.C.S. n. 343. 

 Distrib. Round the world in the tropics. 



11. ARTHRAXON. 



Arthraxon, Beauv. Agrostog. Ill, t. 11, f. 6 ; Benth. et Hook. Gen. PI. iii. 1128. 

 A small old world genus chiefly of Indian distribution. 



A. molle, Benth. et Hook. Gen. PI. iii. 1128. 



Bedratherum molle, Nees in Edin. New Phil. Journ. xviii. 181. 



Psilopogon Schimperi, Hochst. in" herb. Schimp. Abyss, sect. i. 96 ; Ach. Rich. Tent. Flor. 



Abyss, ii. 447. 



Soeotra. Common. B.C.S. n. 474. Schweinf. n. 696. 



Distrib. From the Atlantic Islands through tropical Africa and Mascarene 

 Islands to India. 



