GRASS FAMILY 187 



Loose sandy soil, deserts of nortlieni ^fexioo, extending sparingly into the 

 adjoining U. S. Cargo Mueliacho, Colorado Desert, Orcutt. 



Eef. — BouTELUUA ARENOSA Vasey, U. S. Dept. Agr. Div. Bot. Bull. 12': 34. 1890. 



4. B. barbata Lag. Annual; culms spreading or prostrate, 6 to 12 inches 

 long; spikes several, usually 4 to 6, about Y^ to ^^ iufh long; spikelets numer- 

 ous, imbricated; gliunes unequal, sealu'ous on keel and somewhat so ou back, 

 awn-pointed from a toothed apex, the second twice as long as the first, l^^ 

 lines long; lemma pilose below, 3-awned, the central between the obtuse sca- 

 brous lobes; rudiment pilose at base, 2-lobed, 3-awned, enclosing an orbicular 

 scale; awns of spikelet about 1 line long. 



De.serts, Utah to southern California (The Needles, Jones 67a in 1884) and 

 south into Mexico. 



Refs. — BouTELOUA BARBATA Lag. Var. Cienc. 2' : 141. 1805. B. polystachya Torr. U. S. 

 Eep. Expl. Miss. Pacif. 5: 366. 1857; Thurb. in Wats. Bot. Cal. 2: 291. 1880. Chondrosium 

 polystarhya Bentb. Bot. Voy. Sulph. 56. 1844. 



5. B. rothrockii Vasey. Perennial; culms erect or spreading, 1 to 2 feet 

 high : spikes several, usually 4 to 6, i^^ to 1 inch long ; spikelets numerous, 

 imbricated; glumes unequal, scabrous ou keel and back, cuspidate and 2- 

 toothed at apex, the second 11^4 lines long, about twice as long as the first ; 

 lemma pilose below, 4-lobed, 3-awned, the awns equal. V/^ lines long; rudiment 

 pilose at base, consisting of 2 short truncate lobes, 3 eijual awns about 1 line 

 long and an included orbicular scale. 



Mesas and foothills, Utah to southern California (Jamacha, Canbij) and 

 Mexico. 



Ref. — BouTELouA ROTHROCKU Vasey, Contr. Nat. Herb. 1: 268. 1893. 



6. B. radicosa Griff. Perennial; culms 6 inches to 2 feet high, erect; blades 

 mostly basal, flat; spikes several to many, % to 1 inch long, irregularly 1- 

 sided ; glumes somewhat unequal, rather broad, the second about 3 lines long ; 

 lemma smooth, bearing 3 short awns; rudiment lanceolate, with 3 long awns. 



Upper foothills and mountains, southern California {Orcutt in 1884) and 

 New Mexico to Mexico. 



Refs. — BouTELOUA R.\DicosA Griff. Contr. Nat. Herb. 14: 411. 1912. Atlieropogon radicosus 

 Fourn. Mex. PI. 2: 140. 1886. Dinehra hromoides H.B.K. Nov. Gen. & Sp. 1: 172. 1816, not 

 Bouteloua hrovioides Lag. 



7. B. gracilis Lag. Perennial; culms erect, 6 inches to 1% feet high; 

 sheaths and blades glabrous; spikes 1 to 3, 1 to 2 inches long, usually a little 

 curved, the rachis not produced; spikelets 21/2 to 3 lines long, densely crowded, 

 pectiiuite; glumes narrow, the first about 1/2 as long as the second, the latter 

 sparsely papillose-pilose on the keel ; lemma pilose, 3-eleft, the lateral divisions 

 awned, the terminal 2-toothed, awned between the teeth ; rudiment 3-awned, 

 pilose at base, a second rudimeutarj' scale above. 



Plains and hills, mountains of southei'n California ; extends fi'om Manitoba 

 to Montana, south to Mexico. 



Locs. — San Bernardino Mts., Airams 2100, Parish Bros. 1.528, Wilder 744; Santa Ana Canon, 

 Hall 7589; Jamacha, Caniy in 1894. 



Refs.— Bouteloua gracilis Lag.; Steud. Norn. Bot. ed. 2. 1: 219. 1840. Chondrosium 

 gracile H.B.K. Nov. Gen. & Sp. 1: 176. 1816. Bouteloua oligostaehya Torr.; Gray, Man. ed. 

 2. 553. 1856; Thurb. in Wats. Bot. Cal. 2: 291. 1880. Atheropogon oligostachyum Nutt. Gen. 

 1: 78. 1818. 



8. B. hirsuta Lag. Perennial; culms erect, 8 inches to 11/2 feet high; 

 sheaths smooth; blades sparsely papillose-liairy, especially on the margins; 

 spikes 1 to 4, % to 2 inches long, the rachis produced into a prominent point 



