HITCHCOCK AND CHASE — GRASSES OF THE WEST INDIES. 287 



1. Sorghastrum parviflorum (Desv.). 



Sorghum parviflorum Desv. ; Hamilt. Prodr. PI. Ind. Occ. 12. 1825. 



Andropogon setosus Griseb. Cat. PI. Cub. 235. 18GG. 



Andropogon agrostoide Speg. Anal. Soc. Ciena Argentina 16: 136. 1883. 



Andropogon francavillanus Fourn. Mex. PI. 2: 56. 1886. 



Sorghastrum francavillanum Hitchc. Contr. U. S. Nat. Herb. 12: 195. 1909. 



Sorghastrum setosum Hitchc. Contr. U. S. Nat. Herb. 12: 195. 1909. 



Sorghastrum agrostoides Hitchc. Bot. Gaz. 51: 300. 1911. 



A tall erect tufted glabrous perennial with long, fiat or subinvolute blades 

 and long lanceolate panicles with slender or subcapillary branchlets and pedun- 

 cles and golden brown spikelets, the ultimate peduncles, the sterile pedicels, 

 and the base of the spikelet clothed with white hairs ; awn variable in length. 



Grassy hillsides, southern Mexico and the West Indies to Argentina. Orig- 

 inally described from Hispaniola. The type of Andropogon setosum is from 

 Cuba. Grisebach cites Piptatherum setosum A. Rich., " ex descr.," but Rich- 

 ard's description does not well apply to this species. It is probably wiser to 

 consider Andropogon setosum as a new species rather than as a change of name 

 and to take Grisebach's specimen, Wright 3897, as the type. Andropogon 

 agrostoide was described from Argentina and Andropogon francavillanus from 

 Mexico. 



Central Cuba, Jamaica, Haiti, Santo Domingo, and Porto Rico (vicinity of 

 San Juan), y^ 



2. Sorghastrum stipoides (H. B. K.) Nash, N. Amer. Fl. 17: 129. 1912. 

 Andropogon stipoides H. B. K. Nov. Gen. & Sp. 1: 189. 1816. 

 Andropogon domingensis Spreng. ; Steud. Nom. Bot. ed. 2. 1: 91. 1840, as 

 _ synonym of A. stipoides. ^\ 



More slender than the preceding, the narrower blades convolute, the spikelets 

 slightly larger, and the awns well developed. 



Palm barrens, eastern Cuba (Guane, Shafer 10353) and Colombia to Brazil. 

 Originally described from Colombia. This is the species referred by Hitch- 

 cock 1 to S. francavillanum. 



17. HETEROPOGON Pers. 



Racemes solitary, the lower part of the rachis not disjointing, bearing 2 to 5 

 pairs of staminate awnless spikelets, the upper part of the rachis disarticulat- 

 ing obliquely at the base of each joint, each forming a sharp callus below the 

 long-awned sessile perfect spikelet, the pedicellate spikelet staminate. 



1. Heteropog-on contortus (L.) Beauv. ; Roem. & Schult. Syst. Veg. 2: 836. 

 1817. 



Andropogon contortus L. Sp. PI. 1045. 1753. 



Andropogon secundus Willd. ; Nees, Agrost. Bras. 364. 1829. 



A tall branching annual with compressed culms, keeled sheaths, scabrous 

 blades, and solitary racemes of imbricate spikelets, the lower awnless, the 

 upper with long brown bent awns. Lemon-scented when fresh. 



Rocky slopes, warmer parts of both hemispheres. Originally described from 

 India. 



Cuba, Jamaica, Haiti, Santo Domingo, Antigua, and Guadeloupe. 



1 Contr. U. S. Nat. Herb. 12: 195. 1909. 

 47877°— 17 3 



