4792 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Jamaica: Black River, Hitchcock 9630. Hope Gardens, Amer. Gr. Nat. Herb. 10, 
11, Harris 11247. Kingston, Hitchcock 9750. Alligator Pond, Hitchcock 9830. 
Gordon Town, Harris 11343, 11512. Yallahs Valley, Harris 11498. 
Harti: Gonaives, Buch 23. 
Santo Dominco: Barahona, Fuertes 43. 
Porto Rico: Between Coamo and Aibonito, Sintenis 1957, Chase 6333. Joyuda, 
Chase 6302. Guanica, Chase 6514. Mayaguez, Chase 6286. Bayamon, 
Fioram 315. Vieques, Chase 6686. 
DanisH West Inptrzs: St. Croix, Eggers in 1876, Ricksecker 66, 384. 
LeEwArD Istanps: Antigua, Wullschlaegel 615, 616. Guadeloupe, Duss 3180. 
Saba, Boldingh 1583 (K. U. Herb.). St. Eustatius, Suringar in 1885 (K. U. 
Herb.). St. Bartholomew, Goés (K. U. Herb.). 
WINDWARD Istanps: Duss 537b (K. U. Herb.). 
12. Panicum arizonicum Scribn. & Merr. 
Panicum arizonicum Scribn. & Merr. U. 8. Dept. Agr. Div. Agrost. Cire. 32: 2. 1901; 
Contr. U. S. Nat. Herb. 15: 44. 1910. 
DISTRIBUTION. 
Open sandy or stony ground, southwestern United States and northern Mexico. 
The type specimen from Arizona. 
Lower Cautrornis: Arroyo San Lazaro, Brandegee in 1902. San José del Cabo, 
Brandegee in 1890. 
Sonora: Nogales, Griffiths 6747, 6759, 
Hitchcock 3637. Lokuka Ranch to Al- 
tar, Griffiths 6891. Guaymas, Palmer 
159 and 208 in 1887. Hitchcock 3562. 
Hermosillo, Hitchcock 3542. 
CuravuaHua: Norogachi, Palmer 1B in 
1885. Chihuahua, Pringle 487. . 
Sryatoa: Topolobampo, Palmer 250 in 
1897. 
DuraNnGo: Without locality, Rose 2280. 
GUERRERO: Rio Balsas, Orcutt 4195. Bal- 
sas, Hitchcock 6775. 
Oaxaca: Tomellin, Hitchcock 6192, Amer. Gr. Nat. Herb. 13. 
Fig. 23.—Distribution of P. arizonicum. 
13. Panicum texanum Buckl. 
Panicum texanum Buckl. Prel. Rep. Geol. 
Agr. Surv. Tex. App. 3. 1866; Contr. U. 8. 
Nat. Herb. 15: 46. 1910. 
DISTRIBUTION. 
Prairies and open ground, often a weed in 
fields, Texas and northern Mexico. The 
type specimen from Texas. 
Nuevo Lxe6n: Monterrey, Mitchcock 
0040. Fig. 24.—Distribution of P. texanum. 
