HITCHCOCK AND CHASE—GRASSES OF THE WEST INDIES. 293 
Second glume as long as the dark fruit; spikelets pubescent. 
8. S. ischaemum, 
Second glume shorter than the fruit; spikelets minutely pubescent or 
subglabrous. 
First glume small but distinct; spikelets about 3 mm. long. 
2. S. sanguinalis. 
First glume obsolete; spikelets less than 2.5 mm. long. 
Plants prostrate, forming mats; blades pilose; fruit pale. 
5. S. serotina. 
Plants erect or ascending; blades glabrous or nearly so; fruit 
black — 6. S. longiflora. 
Rechis not winged. 
Second glume and sterile lemma equal; fruit pale; spikelets glabrous or 
nearly so___--____--________--_--- ee 4, S. simpsoni. 
Second glume shorter than the sterile lemma and fruit. 
Rachis sparsely beset with scattered spreading long hairs; fruit pale. 
1. 8. digitata. 
Rachis with no long hairs; fruit brown. 
Spikelets glabrous______-___________----------- 8. S. curvinervis. 
Spikelets with stripes of dense silky hairs. 
Spikelets 2.5 to 8 mm. long, with copious long silky hairs ex- 
tending beyond the apex of the spikelet. 
10, S. leucocoma. 
Spikelets 1.5 to 2 mm. long. 
Hairs on the spikelet extending beyond the apex as a stiff 
brushlike tip-__-_._-._____________ 12. S. argillacea. 
Hairs on spikelet not brushlike at tip and not extending 
beyond the spikelet. 
Blades villous_____.--___. 11. S. villosa. 
Blades glabrous or nearly so__________-_ 9. S. panicea. 
1. Syntherisma digitata (Swartz) Hitche. Contr. U. S. Nat. Herb. 12: 142. 
1908. 
Milium digitatum Swartz, Prodr, Veg. Ind. Occ, 24. 1788. 
Digitaria horizontalis Willd. Enum. Hort. Berol, 92. 1809. 
Axonopus digitatus Beauv. Ess. Agrost. 12, 154. 1812. 
Digitaria setigera Roth; Roem. & Schult. Syst. Veg. 2: 474. 1817, 
Panicum horizontale Meyer, Prim. Fl. Esseq. 54. 1818. 
Digitaria setosa Desv.; Hamilt. Prodr. Pl. Ind. Occ. 6. 1825, 
Digitaria jamaicensis Spreng. Syst. Veg. 1: 272. 1825. 
Paspalum digitatum Kunth, Rév. Gram. 1: 24. 1829. 
Panicum hamiltonii Kunth, Enum. Pl. 1: 84. 1833. 
Syntherisma setosa Nash, Bull. Torrey Club 25: 300. 1898. 
A decumbent branching stoloniferous weedy annual with pilose sheaths and 
pubescent, often velvety, flat blades, and 5 to 15 very slender lax racemes up to 
8 cm. long, subdigitate or in fascicles along a slender axis. 
A commor weed in fields, open ground, and waste places, tropical regions of 
both hemisvheres. Originally described from Jamaica; the type of Digitaria 
jamaicensis also from Jamaica. Digitaria setosa and Panicum hamiltonit were 
described from the Antilles; Digitaria setigera from India; Digitaria horizontalis 
from Santo Domingo. To be found in probably all of the West Indian islands. 
This is sometimes called in Cuba “ pata de gallina fina” (fine henfoot). 
2. Syntherisma sanguinalis (L.) Dulac, Fl. Haut. Pyr. 77, 1867. CEABGRASS. 
Panicum sanguinale L. Sp. Pl. 57. 1753. 
Digitaria sanguinalis Scop. Fl. Carn. ed. 2. 1: 52. 1772. 
