HITCHCOCK — REVISIONS OF NORTH AMERICAN GRASSES. 149 



as the type of Oplismenus crus-pavonis, but the racemes are not so compact; the awns 

 are 2 to 5 mm. long. 



Panicum aristatum Macfad. Bot. Misc. Hook. 2: 115. 1831. This was described in a 

 footnote to an article entitled, "Sketch of a short botanical excursion in Jamaica." 

 The grass was found in the vicinity of Spanish Town. The type specimen, in the 

 Kew Herbarium, is the form described under Oplismenus crus-pavonis. 



Oplismenus jamaicensis Kunth, Enum. PL 1: 147. 1833. Based upon Panicum 

 aristatum Macfad. and referred to Oplismenus with a query. 



Panicum jamaicense Steud. Nom. Bot. ed. 2. 2: 257. 1841. Based upon Oplismenus 

 jamaicensis Kunth. 



Panicum horridum Salzm. ; Steud. Syn. PL Glum. 1 : 47. 1854. A herbarium name 

 of a Salzmann specimen from Bahia, Brazil, given as synonym of Panicum crusgalli L. 

 Since Echinochloa crusgalli itself 

 is rare in South America and the 

 ■subspecies crus-pavonis is com- 

 mon, the plant is probably the 

 subspecies. 



Panicum crusgalli var. sabuli- 

 cola Doell in Mart. Fl. Bras. 2 2 : 

 142. 1877. Based on Panicum 

 sabulicola Nees. 



Oplismenus angustifolius Fourn. 

 Mex. PL 2: 40. 1886. "Vera 

 Cruz (Gotjin n. 54)." The type 

 specimen, in the Paris Herba- 

 rium, is the form with awns 1 to 

 2 cm. long. 



Echinochloa sabulicola Hitchc. 

 Contr. U. S. Nat. Herb. 17: 

 257. 1913. Based on Panicum 

 ■sabulicola Nees. 



DESCRIPTION. 



Differs from the typical form 

 in having nodding, rather soft 

 panicles, the spikelets averaging 

 smaller, less strongly hispid, the 

 awn variable in length, but 

 usually not over 1 cm. long. 



DISTRIBUTION. 



Marshes and wet places, often 



in the water, Texas and the West 



Indies south to Bolivia and Ar- 

 gentina. Apparently native in tropical America. 



Texas: Pierce, Tracy 7743. 



Lower California: La Paz, Palmer 130 in 1890. 



Chihuahua: Casas Grandes, Nelson 6355a. 



Sinaloa: Culiacan, Palmer 1790 in 1891. 



Durango: Durango, Palmer 730 in 1896. 



Coahuila: Jaral, Schumann 1738. Saltillo, Palmer 418 in 1898. 



Jalisco: Guadalajara, Palmer 430 and 430a in 1886; Hitchcock 7351. Orosco, Hitch- 

 cock 7373. 



Guanajuato: Acambaro, Hitchcock 6949. Irapuato, Hitchcock 7420. 



Queretaro: Queretaro, Basile 30, 31; Arsene 10280; Hitchcock 5810, 5852, 5866. 



Fig. 34. — Echinochloa crusgalli crus-pavonis. 

 1889, Porto Rico. 



From Sintenis 



