GRASS FAMILY 



17; 



1. Bouteloua curtipendula (Michx.) Torr. 

 Side-oats Grama. Fig. 400. 



Chloris curtipendula Michx. Fl. Bor. Am. 1: 59. 1803. 



Bouteloua racemosa Lag. Var. Cienc. 2*: 141. 1805. 



Bouteloua curtif'endula Torr. in Emory, Mil. Reconn. 154 



1S4S. 



Perennial; culms erect, 30-120 cm. high; spikes 

 numerous on an elongated rachis, 5-15 mm. long, 

 reflexed, mostly turned to one side, falling entire 

 from the main axis; glumes narrow, acuminate, 

 scabrous on keel and somewhat so on the back, the 

 second about 5 mm. long; lemma as long as secon.l 

 glume, ovate-lanceolate, 3-nerved, scabrous toward 

 tip, 3-toothed. the palea about as long ; rudiment com- 

 monly as long as lemma, 4-lobed, 3-awned between 

 the lobes, the lateral lobes and awns shorter, or the 

 whole sometimes reduced to 1-3 awns. 



Plains and rocky hills, Montana and Ontario, south to 

 Mexico, extending into southern California (Santa Rosa Moun- 

 tain'). Tuly-Aug. Type locality: Illinois. 



2. Bouteloua aristidoides (H. B. K.) 



Griseb. 

 Needle Grama. Fig. 401. 



Diiicbra aristidoides H. B. K. Nov. Gen. & Sp. 1: 171 

 1816. 



Bouteloua aristidoides Griseb. FI. Brit. W. Ind 537 

 1864. 



Annual; culms spreading, slender, 15-40 cm. 

 tall ; spikes several, slender, about 1 cm. long, 

 falling entire, the 1-3 spikelets distant, appressed 

 to the rachis, the latter ending in a slender naked 

 point; glumes narrow, acuminate, the lirst half 

 as long as the second ; lemma narrowly lanceolate. 

 3-nerved, the nerves pilose, the lateral ending in 

 awned teeth as long as the central acuminate point ; 

 rudiment consisting of a pilose pedicel and 3 

 awns longer than the spikelet. 



Open ground, deserts, and foothills, southern Cali- 

 fornia to western Texas and south into South America. 

 Type locality: ^lexico. 



3. Bouteloua arenosa A'asey. 

 Sand Grama. Fig. 302. 



Bouteloua arenosa Vasey, U. S. Dent. Agr. Div. Bot. Bull. 12': 

 34. 1890. 



Annual; culms spreading or prostrate, about 15 cm. 

 long ; spikes 2-4. many-flowered, about 1 cm. long ; 

 persistent on the main axis; glumes persistent, the 

 florets falling, 1-nerved, tin- first 2 :nni., tlie second 3 

 mm. long; lemma a little shorter than the second 

 glume, pilose below, 4-lobed. the lateral lobes short, 

 3-awned from lietween the lobes, the awns about 3 

 inm. long; palea 4-toothed, 2-awned ; rudiment 1 mm. 

 long, triangular-truncate, pilose at base, 4-lol)ed. witli 

 3 long awns between the lobes. 



Loose sandy soil, deserts of northern Mexico, extending 

 sparingly into the adjoining United States. Cargo Muchacho, 

 Colorado Desert (Orcutt). Type locality: Guaymas. Sonora. 



