HITCHCOCK AND CHASE — GKASSES OF THE WEST INDIES. 309 



9. Paspalum denticulatum Trin. Gram. Pan. 111. 1826. 

 Paspalum lividum Trin.; Scheele, Linnaea 26: 383. 1854. 



A tuftecl glabrous perennial ; culms compressed, ascending from a decumbent 

 base; blades flat, lax; racemes 3 to 5, subflexuous, approximate on the very 

 slender axis, the rachis rather broad, the glabrous spikelets commonly lurid 

 purplish, the glume and sterile lemma very thin. 



Along ditches and in wet ground, southern United States to South America 

 and in Cuba (vicinity of Habana). Originally described from South America; 

 P. lividum described from Mexico. 



10. Paspalum notatum Fliigge, Monogr. Pasp. 106. 1810. 

 Paspalum taphropliyllum Steud. Syn. PI. Glum. 1: 19. 1854. 



Culms tufted, ascending from a short hard rhizome, forming tough mats, the 

 leaves crowded at base, the blades flat, 5 to 8 mm. wide, often elongate; 

 racemes 2, approximate, diverging, usually arcuate ; spikelets solitary, ovate, 

 2.5 to 3 mm. long, the glume and sterile lemma papery, shining. 



Mexico and the West Indies to South America ; in the West Indies common 

 on open slopes and pastures from sea level to 1,000 meters altitude. The 

 spikelets are variable in size, sometimes 3.5 mm. long. Originally described 

 from St. Thomas ; P. taphrophyllum described from Martinique. 



Cuba, Jamaica, Haiti, Porto Rico, Antigua, Guadeloupe, Martinique, and 

 Grenada. 



11. Paspalum minus Fourn. Mex. PL 2: 6. 1886. 



Closely related to P. notatum, perhaps not specifically distinct ; spikelets less 

 than 2.5 mm. long, less shining; racemes more widely diverging, lower leaves 

 often sparsely ciliate. 



Open ground, southern Mexico and West Indies to Uruguay. Originally 

 described from Mexico. 



Cuba (Province of Pinar del Rfo and Isle of Pines), Jamaica (Bull Head 

 Mountain), and Porto Rico (Trujillo Alto). 



12. Paspalum pumilum Nees, Agrost. Bras. 52. 1829. 



Resembling P. notatum, densely tufted, leafy at base, forming mats, the few 

 slender culms ascending ; sheaths and commonly the blades pubescent ; racemes 

 2, approximate, arcuately divergent, the dull oval spikelets about 1.8 mm. 

 long. 



Moist savannas, Leeward Islands to Uruguay. Originally described from 

 Brazil. 



Dominica and Trinidad (Piarco Savanna). 



13. Paspalum serpentinum Hochst. ; Steud. Syn. PI. Glum. 1: 22. 1854. 

 Densely tufted, with gray-villous foliage and slender erect culms 50 to 60 



cm. tall, the long erect stiff blades drying involute ; racemes a slightly divergent 

 pair, the spikelets solitary, nearly orbicular, about 2.5 mm. long, golden brown, 

 transversely marked with dark lines. 



Wet, sandy savannas, Trinidad and Dutch Guiana. Originally described 

 from the latter place and known only from the^type collection until found in 

 Trinidad (Piarco Savanna, Hitchcock 10337). 



14. Paspalum plicatulum Michx. Fl. Bor. Amer. 1 : 45. 1803. 

 Paspalum undulatum Poir. in Lam. Encycl. 5: 29. 1804. 

 Paspalum antillense Husn. Enum. Glum. 13. 1871. 



A tufted suberect perennial, 0.5 to 1 meter tall, with compressed simple 

 culms, linear blades 5 to 10 mm. wide, sometimes sparsely pilose, and few to 

 several arcuate-spreading racemes, 4 to 8 cm. long, the spikelets in pairs, drab- 



