Parr 2, 1912] POACEAE 191 
80. Paspalum Larrafiagai Arech. Anal. Mus. Nac. 
Montevid. 1: 68. 1894. 
pa ett A aaa pubiflorum Vasey, Bull. Torrey Club 13: 167. 1886. Not P. pubiforum 
Pinan Vaseyanum Scribn. Bull. U. S. Dep. Agr. Agrost. 17: 32. 1899. 
A tufted perennial with flat nearly glabrous leaf-blades and long-hairy pointed spikelets. 
Stems 1-1.5 m., tall, stout; lower leaf-sheaths densely papillose-hispid with ascending hairs; 
blades 4 dm. long or less, 8-12 mm. wide, hirsute above at the very base, otherwise glabrous; 
racemes erect, 10-20, the lower 8-12 cm. long, the rachis less than 1 mm. wide; spikelets in 
pairs, acute, 2.3-2.5 mm. long and about 1.4 mm. wide, the first scale wanting, the second 
and third scales 3-nerved, acute, pilose on the margins with very long hairs, the surface, 
especially that of the second scale, pubescent with shorter hairs, the fruiting scale yellowish- 
white. 
TYPE LOCALITY: In low wet grounds in vineyards, Salto, Uruguay. 
DISTRIBUTION: South Carolina to Alabama and Texas; Guatemala; also in South America. 
ILLUSTRATIONS: Bull. U. S. Dep. ‘Agr. Agrost. 17: / 328; Anal. Mus. Nac. Montevid. 1: 69. 
81. Paspalum dilatatum Poir. in Lam. Encyc. 5: 35. 1804. 
Paspalum platense Spreng. Syst. 1: 247. 1825. 
Paspalum ovatum Nees; Trin. Gram. Pan. 113. 1826, 
Paspalum eriophorum Schultes, in R. & S. Syst. Veg. Mant. 3: 560. 1827. 
Paspalum lanatum Spreng. Syst. 4: Cur. Post. 30. 1827.. Not P. lenatum H.B.K. 1815. 
Paspalum dilatatum decumbens Vasey, Bull. Torrey Club 13: 166. 1886. 
A smooth and glabrous perennial, with flat leaf-blades and acute ciliate spikelets. 
Stems 5-17 dm. tall, somewhat compressed; leaf-sheaths compressed, glabrous; blades 3 dm. 
long or less, 3-12 mm. wide; racemes 3-8, 5-10 cm. long, erect or ascending, the rachis 1.2—-1.5 
mm. wide, straight; spikelets in pairs, so densely crowded that they appear as if in four rows, 
3-3.5 mm. long, 2-2.2 mm. wide, nearly orbicular, acute, the first scale wanting, the second 
and third scales 5—7-nerved, the second scale ciliate with very long lax hairs, the third sparingly 
ciliate with much shorter hairs, the fruiting scale orbicular, white at maturity. 
TYPE LOCALITY: Buenos Aires, Argentina. ; 
DISTRIBUTION: Virginia and Tennessee to Florida and Central America; also in South 
America. 
ILLUSTRATIONS: Vasey, Agr. Grasses U. S. 1.2; ed. 2. £/.5; Bull. U. S. Dep. Agr. Agrost. 7: 
J. 31, Bull. U. S. Dep. Agr. Bot. 3:2. 1; Bull. Tenn. Exp. Sta.5:f. 37; 7: f. 19; Britt. & Brown, 
Ul. Fl. f 270 ; Kunth, Rév. Gram. pl. 10; Trin. Ic. pl. 139. 
82. Paspalum difforme Le Conte, Jour. de Phys. 91: 284. 1820. 
A perennial sometimes glaucous grass with short flat leaf-blades and large glabrous spike- 
lets. Stems 5-8 dm. tall; leaf-sheaths rather loosely embracing the stem, the uppermost one 
usually bladeless or with a mere rudiment, generally shorter than the internodes, glabrous, or 
the outer basal ones sometimes pubescent; blades usually less than 1.5 dm. long, less than 1 
em. wide, linear to linear-lanceolate, acuminate, erect or ascending, flat, thickish, both sur- 
faces glabrous, or the upper pubescent with long hairs, especially near the base, the hairs 
arising from papillae; racemes usually 2, sometimes 1 or 3, rarely 4, erect or ascending, less 
than 1 dm. long, usually 4-8 cm., rather stout, the rachis often flexuous and about 1 mm. wide; 
spikelets usually singly disposed, sometimes in pairs, 3-4 mm. long and 2.5-3 mm. wide, oval, 
the first scale wanting, the second and third scales 3-nerved, the fruiting scale brownish when 
mature. 
TYPE LOCALITY : Georgia. ; 
DISTRIBUTION : New Jersey to Florida, and west to Texas. 
ILLUSTRATION: Bull. U. S. Dep. Agr. Agrost. 7: f. 29. 
83. Paspalum floridanum Michx. Fl. Bor. Am. 1: 44. 1803. 
Paspalum macrospermum Fiagge, Gram. Monog. 172. 1810. 
Paspalum glabrum Bosc ; Fligge, Gram. Monog. 173, as synonym. 1810. 
Paspalum arundinaceum Poit. in Lam. Encyc. Suppl. 4: 310. 1816. 
Paspalum altissinum Le Conte, Jour. de Phys. 91: 285. 1820. 
Paspalum floridanum typicum Vasey, Bull. Torrey Club 13: 166. 1886. 
Paspalum floridanum glabratum Engelm.; Vasey, Bull. Torrey Club 13: 166. 1886. 
Paspalum glabraium C. Mohr, Bull. Torrey Club 24: 21. 1897. 
