Part 2, 1912] POACEAE 193 
87. Paspalum pilosum Lam. Tab. Encyc. 1: 175. 1791. 
Panicum monostachyum H.B.K. Nov. Gen. & Sp. 1:96. 1815. 
Vasey 104 Ly e Dp Not Paspalum monostachyum 
Dimorphostachys monostachya Fourn. Mex. Pl. Gram. 14. 1881. 
Stems up to 7 dm. tall, sometimes branching at the base, often with leafless flower-bearing 
branches from the uppermost axil; leaf-sheaths ciliate, hispid at the apex, otherwise glabrous; 
blades up to 2 dm. long, 3-6 mm. wide, flat, linear, long-acuminate, papillose-hispid on both 
surfaces and also often pubescent with shorter soft hairs, the midnerve very prominent on the 
lower surface; raceme 1, or sometimes 2, 6-10 cm. long, usually curved, the rachis about 1 
mim. wide, usually setiferous; spikelets in pairs, 2.2-2.8 mm. long, 1.3-1.6 mm. wide, elliptic 
to obovate, the first scale of the lower spikelet half as long as the spikelet, acute, the corre- 
sponding scale of the upper spikelet less than one fourth as long as the spikelet, sometimes 
rudimentary or wanting, the second and third scales 5-nerved, the fruiting scale yellowish, 
roughened with manifest papillae. 
TYPE LOCALITY: Tropical America. 
DISTRIBUTION: Costa Rica; also in tropical South America. 
ILLUSTRATION: Kunth, Rév. Gram. p/. 104. 
88. Paspalum unispicatum (Scribn. & Merr.) Nash. 
Panicum unispicatum Scribn. & Merr. Bull. U. S. Dep. Agr. Agrost. 24: 14. 1901. 
A perennial with long scaly rootstocks and stolons. Stems up to 1 m. tall, glabrous, 
branching below, with leafless flower-bearing branches from the uppermost axil; leaf-sheaths 
glabrous to papillose-hirsute, ciliate; blades up to 3 dm. long, 6-12 mm. wide, linear, long-acumi- 
nate, often ciliate, papillose-hirsute on both surfaces or rarely glabrous; raceme 1, or rarely 2, 
straight or curved, up to 1.5 dm. long, the rachis about 1 mm. wide, glabrous; spikelets in 
pairs, glabrous, 2.5-4 mm. long, 1.4-2 mm. wide, elliptic, the first scale of the lower spikelet 
acute, as long as the spikelet or nearly so, or sometimes short and truncate, apiculate, the 
corresponding scale of the upper spikelet much shorter, usually obtuse, or rarely rudimentary 
or wanting, the second and third scales 3-nerved, or if 5-nerved, the lateral nerves approximate 
and the internerves differing much in width, the fruiting scale yellowish, roughened with 
manifest papillae. 
TYPE LOCALITY: Valley of Oaxaca, Oaxaca. 
DISTRIBUTION : Texas ; Mexico; Cuba. 
89. Paspalum bifidum (Bertol.) Nash, Bull. Torrey 
Club 24: 192. 1897. 
Panicum floridanum Trin. Mém. Acad. St. Petersb. VI. 32: 248. 1834. Not Paspalum flori- 
danum Michx. 1803. 
Panicum bifidum Bertol. Mem. Accad. Bologna 2: 598. 1850. 
Panicum alabamense Trin.; Steud. Syn. Gram. 64. 1854. 
Paspalum racemulosum Nutt.; Chapm. Fl. S. U.S. 571. 1860. 
Paspalum interrupium Wood, Class Book ed. 1361. 783. 1861. 
Paspalum racemosum Beal, Grasses N. Am. 2: 87. 1896. Not P. racemosum Lam. 1791. 
A glaucous perennial with stout scaly rootstocks, the scales appressed-hirsute, flat leaf- 
blades, and glabrous spikelets. Stems 7-13 dm. tall, single; leaves mostly at the base of the 
stem; sheaths, at least the external basal ones, papillose-hirsute; blades 3 dm. long or less, 
generally 5-10 mm. wide, narrowed at both ends, glabrous or but sparingly hirsute beneath, 
strongly hirsute above toward the base; racemes usually 2 or 3, sometimes more or only 1, 
7-15 em. long, erect, the rachis triangular, slender, the lateral margins not winged; spikelets 
in rather distant pairs, oval, 3.5-4 mm. long and about 2.5 mm. wide, the first scale wanting, 
or sometimes present but small or rudimentary, the second scale 7-nerved, the third scale 
5-nerved, the fruiting scale yellowish, minutely roughened. 
TYPE LOCALITY: Alabama. 
DISTRIBUTION: South Carolina to Florida, and west to Texas. 
ILLUSTRATIONS: Bull. U. S. Dep. Agr. Agrost. 17: 334; Mem. Accad. Bologna 2: pi. 41, f. 2. 
90. Paspalum fimbriatum H.B.K. Nov. Gen. & Sp. 1: 93. 1815. 
Stems tufted, up to 7 dm. tall, glabrous, often branched below; leaf-sheaths papillose-hir- 
sute, or sometimes glabrous; blades up to 2.5 dm. long and 1.5 cm. wide, flat, linear, acute, ciliate, 
