480 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
DIFFUSA. 
Second glume and sterile lemma elongated, at least three times 
as long as the fruit. .......2............ wee ee eee eee eee 28. P. capillarioides. 
Second glume and sterile lemma not elongated. 
Culms as much as 1 cm. thick; blades 2 cm. or more wide.. 33. P. hirsutum. 
Culms slender; blades not over 1 cm. wide. 
Blades 1 to 3 mm. wide; plants spreading or ascending. 29. P. diffusum. 
Blades mostly over 5 mm. wide; plants erect. 
Spikelets 4 to 4.2 mm. long, the midnerves of 
glumes and sterile lemma scabrous toward 
the apex....... 2.2.0.2... 2c eee eee ee 31. P. lepidulum. 
Spikelets usually less than 3.5 mm. long. . 
Blades hirsute on both surfaces (sometimes 
glabrescent), not at all glaucous........ 32. P. ghiesbreghtii. 
Blades glabrous on both surfaces or with a few 
hairs on either surface, glaucous above.. 30. P. hallii. 
28. Panicum capillarioides Vasey. 
Panicum capillarioides Vasey in Coulter, 
Contr. U.S. Nat. Herb. 1: 54. 1890; Contr. 
U.S. Nat. Herb. 15: 72. 1910. 
DISTRIBUTION. 
Prairies, southern Texas and northern 
Mexico, The type specimen from Texas. 
Nuevo Leon: Monterrey, Hitchcock 
Fia. 41.—Distribution of P. capillarioides. 5547. 
29. Panicum diffusum Swartz. 
Panicum diffusum Swartz, Prodr. Veg. Ind. Occ. 23. 1788; Contr. U. S. Nat. Herb. 
15: 72. 1910. 
Panicum guadalupense Spreng.; Steud. Nom. Bot. ed. 2. 2: 257. 1841. This is a 
nomen nudum, ascribed to ‘‘Spr. hrb. Trin. mpt. Guadal.’”’ In the Krug & Urban 
Herbarium is a specimen of Panicum diffusum, collected by ‘‘Bertero, 8S. Domingo,” 
marked in Sprengel’s hand ‘‘Panigum guadalupense.”’ 
DISTRIBUTION. 
Banks, cliffs, and savannas, West Indies. The type specimen from Jamaica or 
Hispaniola, 
Bawamas: New Providence, Britton & Brace 424. 
Cusa: Campo Florido, Leén 3449. 
Vibora Habana, Leén 2532. 
Monte la Noria, Leén 2559. 
Bahfa Honda, Wilson 9443. 
Holguin, Shafer 1512. La 
Gloria, Shafer 385. Columbia, 
Leén 305 in part, 923b. Ar- 
royo Apolo, Leédn 190, 923. 
Province of Santa Clara, Leén 
923c. Santiago de las Vegas, 
Tracy 9111, Van Hermann 1444, 
Baker & Wilson 511, Wilson 1405.' Handbana, Wright in 1865. Triscornia, 
Tracy 9082. Guanajay, Palmer & Riley 802. Isle of Pines, Curtiss 384, 494. 
Without locality, Wright 1540, 3852, 3860 in part, 3877. 
Fic. 42.—Distribution of P. diffusum. 
