HITCHCOCK AND CHASE TROPICAL NORTH AMERICAN PANICUM. 479 



25. Paniciiin sonorum Beal. 



Panicum sonorum Beal, Grasses N. Amer. 2: 130. 1896; Contr. U. S. 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. 

 Sinaloa: Culiacdn, Palmer 1539 and 



1554 in 1891. 

 Chiapas: Between San Ricardo and 



Ocozucuantla, Nelson 2959. Fig. 38.— Distribution of P. sonorum. 



26. Panicum parcum llitchc. & Chase. 

 Panicum parcum Hitchc. & Chase, Contr. U. S. Nat. Herb. 15: 68. 1910. 



DISTRIBUTION. 



Open rocky soil, Sinaloa to Guerrero. 

 The type specimen from Sinaloa. 



Sinaloa: Lodiego, Palmer 1657. Cop- 

 radia, Brandegee in 1904. 



Colima: 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. 



Costarica: Buenos Aires, Tonduz 



3685. 

 Panama: Dolega, HitcJicocJc 8335. 



David, Amer. Gr. Nat. Herb. 



31. 

 Cuba: Isle of Pines, Curtiss .267, 



Taylor 34, Palmer & Riley 1086. 



Herradura, Tracy 9073, BriUon, 



Earle & Gagcr 6520. Sierra de 



Cabra, Brition, Earle & Gagcr 



7275. Laguna Jovei'o, iS/iq/e?- 10910. Sumidero, Ze6;i c& iS/ia/e?- 13717. Pinar 



del Rio, Wright 3865. 



Fig. 40. — Distribution of P. cayennense. 



Vft^vW^,- 



