480 



CONTRIBUTIONS FKOM THE NATIONAL HEEBARIUM. 



DIFFUSA. 



Second glume and sterile lemma elongated, at least tliree times 



as long as the fruit 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. diffijisum. 

 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 31. P. lepidulum. 



Spikelets usually less than 3.5 mm. long. 



Blades hirsute on both surfaces (sometimes 



glabrescent), not at all glaucous 32. P. ghieshreghtii. 



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 

 5547. 



Fig. 41. — Distribution of P. capillarioides. 



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, S. Domingo," 

 marked in Sprengel's hand ''Panicum guadalupense." 



DISTRIBUTION. 



Banks, cliffs, and savannas, "West Indies 

 Hispaniola. 



Bahamas: New Providence, Britton & Brace 424 

 Cuba: Campo Florido, Leon 3449. 



Vibora Habana, Leon 2532. 



Monte la Noria, Leon 2559. 



Bahia Honda, Wilson 9443. 



Holguin, Shafer 1512. La 



Gloria, -S^/jo/er 385. Columbia, 



Leon 305 in part, 923b. Ar- 

 royo Apolo, Le6n 190, 923. 



Province of Santa Clara, Leon 



923c. Santiago de las Vegas, 



Tracy 9111, Van Hermann 1444, 



Baker <fc Wilson 511, Wilson 1405. 



The type specimen from Jamaica or 



Fig. 42.— Distribution of P. diffusum. 



Hanabana, 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. 



