HITCHCOCK AND CHASE—TROPICAL NORTH AMERICAN PANICUM. 479 
25. Panicum sonorum Beal. 
Panicum sonorum Beal, Grasses N. Amer. 2: 130. 1896; Contr. U. 8. Nat. Herb. 
15: 67. 1910. ; 
DISTRIBUTION. 
Rich bottom land, northwestern Mexico. 
The type specimen from Lerdo. 
Sonora: Lerdo, Palmer 947 in 1889. 
Without locality, Palmer in 1885. 
CHIHUAHUA: Southwestern Chihuahua, 
Palmer ic in 1885. 
Stmnatoa: Culiacén, Palmer 1539 and 
1554 in 1891. 
Cutapas: Between San Ricardo and ; 
Ocozucuantla, Nelson 2959. Fie. 38.—Distribution of P. sonorwm. 
26. Panicum parcum Hitche. & Chase. 
Panicum parcum Hitche. & Chase, Contr. U. 8. Nat. Herb. 15: 68. 1910. 
DISTRIBUTION. 
Open rocky soil, Sinaloa to Guerrero. 
The type specimen from Sinaloa. 
SinaLtoa: Lodiego, Palmer 1657. Cop- 
radia, Brandegee in 1904. 
Cotuma: Alzada, Orcutt 4687, Hitchcock 
7081. 
GUERRERO: Balsas, Hitchcock 6808, 
6810, 6811, Amer. Gr. Nat. Herb. 
Fig. 39.—Distribution of P. parcum. 30. 
27. Panicum cayennense Lam. 
Panicum cayennense Lam. Tabl. Encycl. 1: 173. 1791; Contr. U. S. Nat. Herb. 15: 
70. 1910. 
DISTRIBUTION. 
Open ground and pine woods, Cuba, Costa Rica to Brazil. The type from French 
Guiana. 
Costa Rica: Buenos Aires, Tonduz 
3685. 
Panama: Dolega, Hitchcock 8335. 
David, Amer. Gr. Nat. Herb. 
SL, 
Cusa: Isle of Pines, Curtiss 267, 
Taylor 34, Palmer & Riley 1086. 
Herradura, Tracy 9073, Britton, 
Earle & Gager 6520. Sierra de 
Cabra, Britton, Earle & Gager 
7275. Laguna Jovero, Shafer 10910. Sumidero, Leén & Shafer 13717. Pinar 
del Rio, Wright 3865. 
Fig. 40.—Distribution of P. cayennense. 
