MANUAL OF THE GRASSES OF THE WEST INDIES 119 
narrow, 3-nerved, the lateral nerves near the margin, the apex 
minutely bifid, bearing between the teeth a slender awn, or rarely 
awnless. Perennials or rarely annuals, with short, flat, stiff blades, 
numerous stiff, slender, divergent spikes loosely scattered along the 
upper part of the culm, or sometimes aggregate toward the summit, 
the spikes often deflexed at maturity. 
Spikes 2 to 4 em long, aggregate at the summit of the naked culms; annual. 
. G. FOLIOSUS. 
Spikes 10 to 25 cm long, scattered along the upper part of the culms; perennial. 
Blades ovate-lanceolate, 2 to 5 em long; culms mostly not more than 30 cm 
ECU CES ed, WO am, UR er laa Ro 2. G. AMBIGUUS. 
Blades linear-lanceolate, 3 to 7 cm long; culms 50 to 100 em tall_3. G. sPIcaTUS. 
1. Gymnopogen foliosus (Willd.) Nees, Agrost. Bras. 426. 1829. 
Chloris foliosa Willd., Sp. Pl. 4: 924. 1806. St. Thomas. 
Biatherium foliosum Desv., Opuse. 72. 1831. 
Arnual; culms wiry, erect or decumbent at base, short-joimted, 15 
to 50 cm tall; blades numerous, short, squarrose, mostly 1 to 2 cm 
long, sharp-pointed; spikes 3 to 7, erect or ascending, 2 to 3 cm long; 
glumes 3 to 4 mm long; lemma 2.5 mm long, the awn 1.5 cm long. 
_ ue barren sands, Puerto Rico, Hispaniola, and St. Thomas to 
razil. 
Puerto Rico: Laguna Tortuguero, Britton 7955. Campo Alegre, 
Chase 6611, 6789 (Amer. Gr. Nat. Herb. 661). 
Dominican Repusuic: ‘Santo Domingo” in Trinius Herbarium. 
2. Gymnopogon ambiguus (Michx.) B.S. P., Prel. Cat. N. Y. 69. 
1888. 
Andropogon ambiguus Michx., Fl. Bor. Amer. 1: 58. 1803. Caro- 
lina. 
Culms 30 to 60 cm tail, in small clumps with short scaly rhizomes, 
suberect to spreading, rigid, sparingly branching; leaves numerous, 
approximate with overlapping sheaths, or the lower rather distant; 
blades spreading, 5 to 15 mm, mostly about 10 mm wide, the base 
rounded-truncate; spikes 10 to 20 cm long, floriferous from base, 
the lower spikelets often remote; glumes 4 to 6 mm long; lemma with 
an awn 4 to 6 mm long, the rudiment bearing a delicate shorter awn 
(fig. 76). 
Dry pine lands, southern United States; Hispaniola. 
Dominican REPUBLIC: Constanza, Ekman H 14023. El Tetero, 
Ekman H 13721. San Juan, Ekman H 13538. San José de Ocoa, 
Ekman H 119382. 
3. Gymnopogon spicatus (Spreng.) Kuntze, Rev. Gen. Pl. 37: 354. 
1898. 
Polypogon spicatus Spreng., Syst. Veg. 1: 243. 1825. Brazil. 
Gymnopogon filiformis Griseb., Ri Brats. Wi ind. $538. 11304: 
Trinidad. 
Perennial; culms slender, wiry, 50 to 100 cm tall; blades thickish, 
linear-lanceolate, 3 ie 7 cm long; inflorescence commonly nearly half 
the entire length of the plant; spikes slender, divaricate, 15 to 25 
em long, naked or nearly so for the lower one-third to half their 
length. 
Sterile hills, Trinidad to Argentina. 
TrinipaD: Without locality, Bot. Gard. Herb. 3361. 
