HITCHCOCK AND CHASE TROPICAL NORTH AMERICAN PANICUM. 463 



Culms stout, erect or nearly so; spikelets 

 tiirgid, sparsely hirsute. 



76. P. rudgei. 

 Spikelets glabrous. 



Culms straggUng; spikelets minute. 



68. P. trichanthum. i 

 Culms erect or stiffly ascendiag; blades 

 linear, usually elongated. 

 Sheaths glabrous; culms 1.5 to 2 meters 



high 40. P. ichnanthoides. 



Sheaths hirsute, or if glabrous the culms 

 less than 1 meter high. 



See Diffusa, p. 480. 



ANNOTATED LIST OF THE SPECIES. 



Subgenus PAUROCHAETIXJM Hitchc. & Chase. 



Bla.des less than 10 cm. long, not narrowed toward the base; 



spikelets about 2.5 mm. long 4. P. ramisetum. 



Blades elongated, usually more than 15 cm. long, narrowed 

 toward the base. 

 First glume rounded or truncate; second glume about as 



long as fruit 3. P. chapmani. 



First glume acute; second glume about two- thirds as long as 

 fruit. 



Spikelets 1.5 mm. long; blades involute 1. P. distantiflorum. 



Spikelets 2 mm. long; blades flat 2. P. utowanaeum. 



1. Panicum distantiflorum A. Rich. 



Panicum distantijloruvi A. Rich, in Sagra, Hist. Cuba 11:304. 1850; Contr. U. S. 

 Nat. Herb. 15: 23. 1910. 



DISTRIBUTION. 



Limestone hills at low altitudes, Bahamas to Cuba and Haiti; Curasao. The type 

 specimen from Cuba. 



Bahamas: Inagua, Hitchcock in 



1890, Nash & Taylor 893 (both 



Field Mus. Herb.). 

 Cuba: Playa de Cojimar, Hitchcock 



144, Leon 912. Near Habana, 



Ze(5n 305 b, 567, 2382. Santiago, 



Le6n 917 . Silla de Cayo, Shafcv 



2512. Guanoroca, Wright 284. 



Hanabana, Wright2'&b. Playa 



de Marianao, Le6n in 1909. 



Without locality, Wright 3452. 

 Santo Domingo: Naranjo, Fuertes 1284. Los Charcos, Fuertes 1427. 

 CuRAfAo: Britton & Shaf er 30SS. Bonaire, Suringar in 1885. (K. U. Herb.)^ 



Fia. 11.— Distribution of P. distantiflorum. 



^ Krug & Urban Herbarium. 



