HITCHCOCK AND CHASE—GRASSES OF THE WEST INDIES. 277 
1. Trachypogon gouini Fourn. Mex. Pl. 2: 66. 1886. 
A tall slender glabrous unbranched perennial, usually geniculate below, spar- 
ingly producing scaly rhizomes; blades involute, the narrow puale feathery 
raceme up to 30 cm. long. 
Open ground in the vicinity of Habana, Cuba, introduced from eastern Mexico. 
Originally described from Veracruz. 
2. Trachypogon filifolius (Hack.) Hitche. Contr. U. 8. Nat. Herb. 12: 191. 
1909. 
Trachypogon polymorphus var, filifolius Hack. in Mart. Fl. Bras. 2*: 264. 1883. 
More slender than the preceding, without rhizomes, the raceme with coarser 
shorter less feathery awns. 
Sandy pine woods, western Cuba; also in Brazil, whence originally described. 
3. Trachypogon plumosus (Humb. & Bonpl.) Nees, Agrost. Bras. 344, 1829. 
Andropogon plumosus Humb. & Bonpl.; Willd. Sp. Pl. 4: 918. 1806. 
Trachypogon polymorphus var. plumosus Hack. in Mart. Fl. Bras. 2°: 265. 1883. 
Usually stouter than the other two, the culms sparingly branching, the blades 
flat, the spikes commonly 2 or 3. 
Wet sandy savannas, Central America to Brazil. Originally described from 
Cumanaé, Venezuela, 
Trinidad (Piarco Savanna, Hitchcock 10342; St. Joseph, Hitchcock 10185, 
and Arima, Eggers 1379). 
11. ARTHRAXON Beauv. 
Perfect spikelets awned, sessile, the secondary spikelet and its pedicel want- 
ing or present only at the lower joints of the filiform articulate rachis; racemes 
terminating the branches of a dichotomously forking panicle, in appearance sub- 
digitate or fascicled. 
1. Arthraxon quartinianus (A. Rich.) Nash, N. Amer. FI]. 17: 99. 1912. 
Alectoridia quartiniana A, Rich, Tent. Fl. Abyss. 2: 448. 1852, 
Arthrazon ciliaris subsp. quartinianus Hack. in DC. Monogr. Phan, 6: 356. 
1889. 
A weak-stemmed, laxly branching creeping annual, with ascending flowering 
branches, bearing flat thin ovate blades cordate at base and flabellate fascicles 
of slender spikes. 
Shady banks, Jamaica and Guadeloupe, introduced from tropical regions of 
the Old World. Originally described from Abyssinia. 
12. ANDROPOGON L. 
Sessile spikelet perfect, usually awned; pedicellate spikelet staminate or 
neuter; rachis articulate; racemes solitary, digitate, or approximate along a 
continuous main axis. The species with woolly inflorescence are often called 
“barba de indio” in the Spanish islands. In the English islands Andropogon 
bicornis and A, glomeratus are called “ foxtail.” 
Sterile or pedicellate spikelets as large as the perfect ones or larger, imbricate ; 
racemes mostly single. (See also A. pertusus and A. annulatus with 
several racemes. ) 
Plants annual; outer glume of sterile spikelet large, bractlike, partly con- 
cealing the perfect spikelets____.________-__--__--_- 1. A. fastigiatus. 
Plants perennial; sterile spikelets not much larger than fertile ones, not 
concealing them. 
Peduncle glabrous below the raceme____---__---____ 10. A. caricosus. 
Peduncle pubescent below the raceme_____.--_________ 11. A. nodosus. 
