372 



Bulletin No. 205 



[March, 



Rachis of the spike projecting beyond the spikelets in a prominent point; 

 keel of the second glume pubescent, the hairs from prominent black papil- 

 lae; the sterile lemma not with a tuft of hairs at the base. B. hirsuta 



Eachis of the spike not projecting beyond the spikelets ; keel of the second 

 glume glabrous or with few hairs, these not from papillae; sterile lemma 

 with a tuft of hairs at the base. B. gracilis 



195 



196 



Figs. 195-199. — 195, B. curtipendula, inflorescence; 196, B. hirsuta, inflores- 

 cence; 197, B. gracilis, spikelet; 198, B. hirsuta, spikelet; 199, B. ciirtipeiidula, 

 spikelet 



Bouteloua curtipendula (Michx.) Torr. 



Tall Grama Grass^ Mesquite Grass. Side-oat. Grama 



(Figs. 195 and 199) 



Chloris curtipendula, Michaux '03, 59, Atheropogon apludioides, Engelmann 

 '44, 104; Lapham '57, 54fi, 572. Botitcloua curtipendula, Pattorson '76, 50; 

 Plagg '78, 281; Brendel '87, 63; Huett '97, 130. Atheropogon ciirtipendulus, 

 Gleason '07, 182. Bouteloua curtipendula, Gleason '10, 148. 



Culms 1 to 3 feet tall, smooth; sheaths smooth, hairy at the throat; 

 blades slightly rough, sometimes pubescent at base, 2 to 12 inches 

 long, 2 to 4 mm. wide ; spikes short, numerous, arranged on either 

 side of the axis, each consisting of from 5 to 8 spikelets; spikelets 7 

 to 10 mm. long. 



