Part 2, 1912] POACEAE 173 
acute, very delicate and hyaline, the fruiting scale elliptic, a little shorter than the outer scales, 
obtuse. 
Type collected near Guadalajara, Jalisco, Mexico, October 2, 1891, C. G. Pringle 3854 (herb. 
Columbia Univ.). 
DISTRIBUTION : Jalisco. 
9. Paspalum dissectum L,. Sp. Pl. ed. 2. 81. 1762. 
Panicum dissectum UL. Sp. Pl. 57. 1753, 
Paspalum membranaceum Walt. F1. Car, 75. 1788. 
Paspalum vaginatum Ell, Bot. S. C. & Ga. 1: 109, 1816. 
Paspalum Walterianum Schultes, in R. & S. Syst. Veg. Mant. 2: 166. 1824. 
Paspalum tectum Steud. Syn. Gram. 29. 1854. 
Paspalum Walieri Schultes; Chapm. Fl. S. U. S. 570. 1860. 
Paspalum Drummondi C. Muell, Bot. Zeit. 19: 332. 1861. 
A slender usually creeping branched plant, the racemes few, with a broad thin-margined 
rachis which encloses the spikelets. Stems up to 8 dm. long, compressed, frequently rooting 
at the lower nodes; leaf-sheaths compressed, loose, glabrous, commonly shorter than the 
internodes, or overlapping on the branches; blades 3-8 cm. long, 4-8 mm. wide, flat, smooth, 
glabrous, narrowed at both ends; inflorescence exserted, usually less than 1 dm. long; racemes 
3-7, erect or ascending, 2-3 cm. long, the rachis acute, but not extending beyond the spikelets, 
about 2 mm. wide; spikelets singly disposed in two rows, 2-2.3 mm. long, 1.3-1.5 mm. 
wide, oval, glabrous. 
TYPE LOCALITY: North America. 
DISTRIBUTION : New Jersey to Missouri, and south to Florida and Texas; Cuba. 
_ ILLUSTRATIONS: Bull. U. S. Dep. Agr. Agrost. 17: f. 326; Bull. Tenn. Exp. Sta. 7: f. 16; 
Britt. & Brown, Ill. Fl. f, 228; Trin. Ic. pl, 124. 
10. Paspalum acuminatum Raddi, Agrost. Bras. 25. 1823. 
Stems up to 6 dm. long, glabrous, smooth, rooting at the lower nodes; leaf-sheaths smooth 
and glabrous, very rough on the margins; racemes 1 or 2, 4-5 cm. long, erect or ascending, the 
rachis about 3 mm. wide, smooth; spikelets 3-3:5 mm. long, singly disposed in 2 rows, elliptic, 
acute, glabrous, the first scale wanting, the second and third scales herbaceous, acute, 5-nerved, 
a little longer than the elliptic, obtuse fruiting scale, which is minutely pubescent at the apex. 
TYPE LOCALITY: Brazil. : 
DistRIBUTION : Guatemala ; also in Brazil. 
11. Paspalum prostratum Scribn. & Merr. Bull. U. S. Dep. 
Agr. Agrost. 24:9. 1901. 
Paspalum prostratum pygmaeum Scribn. & Merr. Bull. U. S. Dep. Agr. Agrost. 24:9. 1901. 
Stems 1-6 dm. long, branched, prostrate or ascending, glabrous; leaf-sheaths ciliate on 
the margins, glabrous or pubescent; blades up to 6 cm. long and 1 cm. wide, ovate to lanceolate, 
hirsute, acute; inflorescence 3-4 cm. long, of 3-10, rarely fewer, spreading or sometimes reflexed 
racemes 1—2.5 cm. long, the rachis 2-3 mm. wide, thin, acute, smooth, rough on the margins; 
spikelets singly disposed in 2 rows, elliptic to obovate, 2 mm. long, glabrous, obtuse, the first 
scale wanting, the second and third scales about equal, the second 3-nerved, the third 3—-5- 
nerved, the fruiting scale elliptic, obtuse, about equaling the empty scales. 
TYPE LOCALITY : Low lands near Patzcuaro, Michoacan. 
DISTRIBUTION: Michoacan and Hidalgo. 
12. Paspalum mucronatum Muhl. Cat. 8. 1813; Descr. 
Gram. 96. 1817. 
Paspalum paniculaium Walt. Fl. Car. 75. 1788. Not P. paniculatum L. 1759. 
Ceresia fluitans Ell. Bot. S. C. & Ga. 1: 109. 1816. 
Paspalum natans Le Conte, Jour. de Phys. 91: 285. 1820. 
Paspalum fluitans Kunth, Rév. Gram. 24, 1829. 
Paspalum Frankii Steud. Syn. Gram. 19. 1854. 
A branched floating or creeping grass, commonly rooting at the lower nodes, with broad 
flat leaf-blades, inflated leaf-sheaths, and numerous racemes disposed in panicles. Stems 
