WOOTON AND STANDLEY FLORA OF NEW MEXICO. 51 



New Mexico: Mesilla Valley; Belen; Eagle Creek; Guadalupe Mountains; Lake- 

 wood; Carlsbad. Mesas and valleys, in the Lower Sonoran Zone. 



3. Amphilophis barbinodis (Lag.) Nash in Small, Fl. Southeast. U. S. 65. 1903. 



Andropogon barbinodis Lag. Gen. & Sp. Nov. 3. 1816. 



Type locality: "H [abitat] in N [ova] H [ispania]." 



Range: Southern New Mexico and Arizona and northern Mexico. 



New Mexico: Las Vegas Canyon; Black Range; Silver City; Burro Mountains; 

 Mesilla Valley; Organ Mountains; NaraVisa; Buchanan; Knowles; Carlsbad. Dry 

 hills and mesas, in the Lower and Upper Sonoran zones. 



6. ANDROPOGON L. Tall sage grass. 



Tall perennials, tufted or from elongated rootstocks, with flat or involute leaves and 

 with spikelike racemes disposed in pairs or sometimes in 3's or more, terminating the 

 stem or its branches; spikelets sometimes with a ring of short hairs at the base, in 

 pairs at each node of the jointed and often hairy rachis, one sessile and fertile, the 

 other pedicellate and sterile; glumes indurated, often pubescent; lemma entire or 

 2-toothed at the apex, awned or sometimes awnless; palea small, hyaline; stamens 1 

 to 3; styles distinct. 



KEY TO THE SPECIES. 



Second lemma of the sessile spikelet awnless, or with a short 



straight awn 1. A. hallii. 



Second lemma of the sessile spikelet with a long geniculate awn, 

 more or less twisted at the base. 

 Glumes of the sessile spikelet hispidulous all over; hairs of 



the rachis intcrnodes 2 mm. long or less 2. A. furcatus. 



Glumes of the sessile spikelet glabrous or nearly so except on 

 the nerves;, hairs of the rachis internodes 3 to 4 mm. 

 long 3. A. chrysocomus. 



1. Andropogon hallii Hack. Sitzungsb. Akad. Wiss. Math. Naturw. (Wien) 89: 



127. 1884. 

 Type locality: Colorado. 



Range: Montana and Nebraska to Kansas and Mexico. 



Xi.sv Mexico: Near Portales; Buchanan; northeast of Clay ton ; mountains west of 

 Las Vegas; Nara Visa; Arroyo Ranch. Plains, in the Upper Sonoran Zone. 



2. Andropogon furcatus Muhl.; Willd. Sp. PI. 4: 919. 1806. 

 Andropogon provincialis furcatus Hack, in DC. Monogr. Plum. 5: 1 12. 1889. 

 Type locality: ''Habitat in America boreali." 



Range: British America to Florida and New Mexico. 



New Mexico: Tunitcha Mountains; Dulce. Dry hills and plains, in the Upper 

 Sonoran Zone. 



3. Andropogon chrysocomus Nash in Britton, Man. 70. 1901. 

 Type locality: Stevens County, Kansas. 1 



Range: Kansas and Texas to New Mexico. 



Ni:w Mexico: Carrizo Mountains; White and Sacramento mountains. Plainaand 

 dry hills, in the Upper Sonoran and Transition zones. 



7. HOLCUS L. 

 Tall perennial with numerous long rootstocks, broad flat loaves, and large terminal 

 panicles; spikelets in pairs or 8's at the en<ls of the branches, one sessile and perfect! 

 the others pedicellate and staminate, dorsally compressed, pubescent <>r ^lahroua; 

 glumes indurated; lemma hyaline, awned or awnless; stamens 3; styles distinct. 



1 N. Amer. Fl. 17: 120. 1912. 



