WOOTON AND STANDLEY—FLORA OF NEW MEXICO, 57 
Stems bulbous at the base or rhizomatous. 
Glumes acuminate. 
Spikelets 3 to 5 mm. long; first glume 
acuminate to cuspidate.......... 13. P. virgatum. 
Spikelets 6 to 8 mm. long; first glume 
ACUTE. .... ee eeeee ee eee eee eee eee ld. Py havardii. 
Glumes obtuse or merely acute, never acu- 
minate. 
Culms from a rootstock, not bulbous....15. P. plenum. 
Culms from enlarged bulbous bases. 
Leaf blades over 5 mm. wide; culms 
usually over 1 meter high... .16. P. bulbosum. 
Leaf blades less than 5 mm. wide; 
culms usually less than 1 me- 
ter high....................- léa. P. bulbosum scia- 
, philum. 
1. Panicum obtusum H. B. K. Nov. Gen. & Sp. 1: 98. 1816. 
VINE MESQUITE GRASS. 
Brachiaria obtusa Nash in Britton, Man. 77. 1901. 
Type Loca.ity: “‘Crescit in planitie montana regni Mexicani prope Guanaxuato 
et Burras, in humidis, alt. 1,080 hexap.”’ 
RanaG_E: Colorado and Missouri to Texas, Arizona, and Mexico. 
New Mexico: Common from Gallup, Santa Fe, Las Vegas, and Clayton south- 
ward across the State. Plains and river valleys, in the Lower and Upper Sonoran 
zones. 
|“ 2. Panicum helleri Nash, Bull. Torrey Club 26: 572. 1899. 
Panicum pernervosum Nash, Bull. Torrey Club 26: 576. 1899. 
Type Loca.ity: Kerrville, Kerr County, Texas. 
Ranae: Missouri and Louisiana to Texas and New Mexico. 
New Mexico: West Fork of the Gila; Sierra Grande. Plains and low hills, in the 
Upper Sonoran Zone. 
8. Panicum scribnerianum Nash, Bull. Torrey Club 22: 421. 1895. 
Typr Locaity: Pennsylvania. 
Ranae: Washington and Maine to California, New Mexico, Texas, and Maryland. 
New Mexico: Las Vegas (Cockerell). Dry fields, in the Upper Sonoran Zone. 
4. Panicum fasciculatum reticulatum (Torr.) Beal, Grasses N. Amer. 2: 117, 1896. 
Panicum reticulatum Torr. in Marcy, Expl. Red Riv. 299, 1852, 
Tyre Locatity: ‘‘Main fork of Red River,’’ Texas. 
RanaeE: Texas and Arizona to Mexico. 
New Mexico: Socorro (Plank 38). Dry fields. 
5. Panicum arizonicum Scribn. & Merr. U. 8. Dept. Agr. Div. Agrost. Circ. 32: 
2. 1901. 
TyPE LOCALITY: On mesas near Camp Lowell, Santa Cruz Valley, Arizona. 
Rance: New Mexico and southern California to northern Mexico. 
New Mexico: Mogollon Creek; Mangas Springs; Burro Mountains; Hillsboro; mesa 
west of Organ Mountains. Dry hills and sandy mesas, in the Lower and Upper 
Sonoran zones. 
6. Panicum dichotomiflorum Michx. Fl. Bor. Amer, 1:48, 1803. 
Type LocaLity: ‘‘Hab. in occidentalibus montium Alleghanis.”’ 
Rance: Maine and Nebraska to Florida and Texas, and in California; also in 
Mexico, the West Indies, and South America. 
New Mexico: Las Cruces (Plank 29). Lower and Upper Sonoran zones. 
