176 NORTH AMERICAN FLORA [VoLUME 17 
raceme; spikelets in pairs, on shorter pubescent pedicels, oval, 1.8-2.2 mm. long, 1.8 mm. 
wide, the first scale wanting, the second and third scales densely pubescent with short gland- 
ular-tipped hairs, 3-nerved, or the third often 2-nerved by the suppression of the midnerve, 
the fruiting scale yellowish-white. 
TYPE LOCALITY: Florida. 
DISTRIBUTION : South Carolina to Florida ; Cuba ; Guadeloupe. 
20. Paspalum psammophilum Nash ; Hitchc. 
Rhodora 8: 205. 1906. 
Paspalum prostratum Nash, in Britton, Man. 74, 1901. Not P. prostratum Scribn. & Merr. 1901. 
A tufted branched softly pubescent perennial with prostrate stems, forming dense mats, 
flat leaf-blades, and densely pubescent spikelets. Stems 5-8 dm. long; leaf-sheaths softly and 
densely pubescent with short hairs; blades 3-10 cm. long, 5-8 mm. wide, lanceolate, erect 
or nearly so, of medium texture, softly and densely pubescent on both surfaces, ciliate on 
the margins; racemes on the main stem 2, rarely more or only 1, 5-8 cm. long, the rachis less 
than 1 mm. wide; spikelets in pairs, about 2 mm. long and 1.8 mm. wide, oval, densely pubescent, 
the first scale wanting, the second and third scales 3-nerved, or the third usually 2-nerved by 
the suppression of the midnerve, the fruiting scale yellowish-white. 
TYPE LocaLity : [Kingsbridge,] New York City. 
DISTRIBUTION: Massachusetts and New York to Delaware. 
21. Paspalum Bushii Nash, in Britton, Man. 74. 1901. 
A tufted branched pubescent perennial, with flat ciliate leaf-blades and pubescent spike- 
lets. Stems erect or ascending; 4-10 dm. tall; leaf-sheaths, at least the lower ones, softly 
pubescent, ciliate on the margins; blades 5-20 cm. long, 5-15 mm. wide, lanceolate, erect or 
ascending, flat, rather firm in texture, softly and densely pubescent on both surfaces with short 
hairs more or less intermixed with long rather stiff hairs, ciliate on the margins; racemes 
usually in pairs on the main stem, 6-12 cm. long, the rachis less than 1 mm. wide; spikelets 
in pairs, 2-2.2 mm. long, 1.4-1.7 mm. wide, oval, the first scale wanting, the second and third 
scales densely pubescent, 3-nerved, or the third scale sometimes 2-nerved by the suppression 
of the midnerve, the fruiting scale yellowish-white. 
TYPE LOCALITY: [Bernie,}] Missouri. 
DISTRIBUTION : Illinois to Nebraska, and south to Texas and Mexico. 
22. Paspalum setaceum Michx. Fl. Bor. Am. 1: 43. 1803. 
A tufted branched perennial with narrow flat pubescent leaf-blades and glabrous or 
pubescent spikelets. Stems slender, 2-7 dm. tall; basal leaf-sheaths densely pubescent with 
long hairs, the upper enes pubescent only on the margins; blades 1.5 dm. long or less, rarely 
somewhat longer, usually 2.5-5 mm. wide, sometimes a little broader, linear, strict and erect 
or ascending, flat, of medium texture, densely pubescent on both surfaces with long hairs; 
racemes single, slender, 4-8 cm. long, sometimes a little longer, the rachis about 0.6 mm. 
wide; spikelets either single or in pairs, on shorter puberulent pedicels, about 1.5 mm. long 
and 1.3 mm. wide, broadly obovate, the first scale wanting, the second 3-nerved, glabrous 
or pubescent with spreading glandular-tipped hairs, the third 2-nerved, the midnerve rarely 
if ever present, glabrous or pubescent, the fruiting scale yellowish-white. 
TYPE LOCALITY: Carolina. 
DISTRIBUTION : New Hampshire to Nebraska, and south to Florida and Texas; Cuba. 
ILLUSTRATIONS: Bull. U. S. Dep. Agr. Agrost.7: 4 26, Britt. & Brown, ll. Fl. f 272. 
23. Paspalum Muhlenbergii Nash, in Britton, Man. 75. 1901. 
Paspalum ciliatifolium Le Conte, Jourt de Phys. 91: 284. 1820. Not P, ciliiatifolium Michx. 1803. 
A tufted branched perennial, with pubescent narrow leaf-blades and glabrous spikelets. 
Stems at first erect, finally reclining, 4-8 dm. long, smooth and glabrous; leaf-sheaths generally 
pubescent all over with long hairs; or sometimes only on the margins; blades 2 dm. long or less, 
rarely longer, usually 7-11 mm. wide, or sometimes narrower, linear to linear-lanceolate, flat, 
of medium texture, more or less pubescent on both surfaces with long hairs, ciliate on the 
