76 POACEAE 
37. Paspalum glabratum (Engelm. ) C. Mohr. Whole plant often glaucous. Stems 
usually 1-2 m. tall, stout, leafy: leaf-sheaths glabrous, or sometimes sparingly pubescent, 
the external basal ones sometimes hirsute ; blades glabrous on the lower surface, the upper 
surface glabrous or more or less hirsute, the lower blades 3-7 dm. long, 6-15 mm. wide: 
racemes usually 3-6, sometimes 2, erect or nearly so, the lower ones commonly 1-1.5 dm. 
long, occasionally shorter or longer: spikelets singly disposed or in pairs, 3.5-4.5 mm. 
long, 2.75-3.5 mm. wide, the 2 outer scales glabrous, 3-nerved. 
In low ground, Maryland to Kansas, Georgia and Texas. Summer and fall. 
38. Paspalum Floridànum Michx. Stems 9-12 dm. tall, rather stout, leafy : leaf- 
sheaths densely hirsute with long hairs ; blades densely hirsute above and usually also on 
the lower surface, the lower ones 3-6 dm. long, 6-10 mm. wide: racemes commonly 2 or 
3, rarely 4, erect, the lower ones usually 8-12 cm. long: spikelets usually singly disposed, 
3.5-4 mm. long, 2.5-3 mm. wide, the 2 outer scales 3-nerved, glabrous. 
In low ground, South Carolina to Florida, west to Texas. Summer and fall. 
39. Paspalum gigantéum Baldw. Stems tufted, 1-1.5 m. tall, stout: leaf-sheaths 
glabrous; blades erect, glabrous on both surfaces, if ciliate on the margins the hairs short, 
the lower leaves 2-3 dm. long, 1.5-2 em. wide: racemes 3-5, finally widely spreading, 
1-1.5 dm. long: spikelets in pairs, about 3.25 mm. long and 2.5 mm. wide, the 2 outer 
scales glabrous, 3-nerved. 
In ditches and swamps, Florida. Summer. 
40. Paspalum longicílium Nash. Stems tufted, ascending, stout, 6-12 dm. tall: 
lower leaf-sheaths densely papillose-hirsute with long shaggy hairs ; blades glabrous on both 
surfaces, the margins ciliate with very long hairs, the lower blades 2-4 dm. long, 1-2 cm. 
wide : racemes ascending, the lower ones 8-17 cm. long : spikelets usually singly disposed, 
3-3.3 mm. long and 2-2.3 mm. wide, the 2 outer scales glabrous, 3-nerved. 
In clay soil in ditches, central peninsular Florida. Summer. 
41. Paspalum Buckleyanum Vasey. Stems erect, 6-8 dm. tall: leaf-sheaths 
smooth and glabrous ; blades 4-20 em. long, 2-4 mm. wide, rough above, smooth beneath : 
racemes erect, 2-4, 5-7 cm. long, the rachis straight, broadly winged, 1.5-2 mm. wide: 
spikelets in pairs, often so crowded as to appear as if in 4 rows, 3 mm. long, about 1.5 mm. 
broad, elliptic, the 2 outer scales 3-nerved, densely appressed-pubescent, the flowering scale 
yellowish at maturity, faintly pitted in fine longitudinal lines. 
«in low grounds, Texas. Summer and fall. 
42. Paspalum lívidum Trin. Stems 6-10 dm. tall: leaf-sheaths compressed, 
keeled, smooth, glabrous, except on the margins ; blades 3 dm. long or less, 3-5 mm. wide, 
more or less pubescent on the upper surface: racemes 3-7, erect or ascending, 2.5-5 cm. 
long, the rachis often setiferous on the margins: spikelets bright green, in pairs, elliptic, 
acute or acutish, about 2.5 mm. long and 1.5 mm. wide, the 2 outer scales 3-nerved, gla-: 
brous, the third scale yellowish white, only slightly convex in cross-section. 
In wet places, Texas. Also in Mexico and South America. Summer. 
43. Paspalum praécox Walt. Stems tufted, compressed, 6-12 dm. tall: leaf-sheaths 
compressed, the lower ones purple, the exterior basal ones hirsute, the remainder glabrous ; 
blades 2 dm. long or less, 4-6 mm. wide, glabrous: racemes usually 4-6, rarely more or 
fewer, ascending, 2-5 cm. long: spikelets in pairs, lenticular, nearly flat on the inner side, 
yellowish green, orbicular to oval, 2.2-2.6 mm. long, 1.8-2.2 mm. wide, the 2 outer 
scales glabrous, 3-nerved, the third scale striately roughened with conspicuous papillae. 
In moist or wet places, South Carolina to Florida and Texas. In spring and early summer ; some- 
times also in the late fall. 
44. Paspalum glabérrimum Nash. Glabrous. Stems single, about 1 m. tall, erect, 
compressed : leaf-sheaths compressed ; blades erect, long-acuminate, the larger 3-4 dm. 
long, 5-8 mm. wide, the upper blade very short or wanting : racemes 3 or 4, ascending, the 
lower 4-7 em. long: spikelets nearly circular, barely if at all convex on one side, 3 mm. 
long, light green, the 2 outer scales 3-nerved. 
In low pine lands, southern peninsular Florida. Summer. 
45. Paspalum tárdum Nash. Stems not tufted, compressed, usually 6-13 dm. tall : 
leaf-sheaths compressed, the outer basal ones densely papillose-hirsute with long hairs, the 
remainder similarly pubescent with very long hairs at the apex ; blades 1.5-2.5 dm. long, 
3-6 mm. wide, glabrous beneath, hirsute above toward the base, especially near the base 
where the hairs are very dense and long : racemes usually 3 or 4, sometimes only 2, spread- 
ing or ascending, commonly 3-6 cm. long, sometimes shorter: spikelets singly or in pairs, 
orbicular or nearly so, 2.2-2.5 mm. in diameter, the 2 outer scales 3-nerved, glabrous, the 
third scale striately roughened with conspicuous papillae. 
In wet ground, Florida to Mississippi. Summer and fall. 
