346 GRASS FAMILY 



(2) Spikelets 6-10-flowered, ascending or 

 somewhat drooping ; lemma 6-8 mm. 

 long; awn 6-8 mm. long B.secalinus 



b. Lemma not awned ; spikelets 7-12-flowered, up 



to 1 in. long B. briziformis 



2. Perennial, usually native 



a. Lower glume 1-nerved; upper glume 3-nerved 



(1) Leaves and sheaths smooth or nearly so; 



spikelets 2-2.5 cm. long, usually awnless B. inermis 



(2) Leaves and sheaths hairy or rough 



(a) Panicle erect; lemma 10-12 mm. long, 



densely hairy, the awn 2-3 mm. long B. pumpellianus 



(b) Panicle drooping 



x. Leaves more or less hairy on both sides ; 

 lemma 8-12 mm. long, sparsely to 

 densely hairy, the awn 4-8 mm. long B. cilidtus 



v. Leaves rough above, smooth beneath ; 

 lemma 12-15 mm. long, hairy, awn 3- 

 5 mm. long B. Richardsonii 



b. Lower glume 3-nerved ; upper glume 3>-7- 



nerved 



(1) Panicle erect 



(a) Leaves and sheaths hairy; spikelets 5- 



10-flowered ; lemma hairy B. margindtus 



(b) Leaves and sheaths usually smooth or 



rough, not hairy; spikelets 7-1 1 -flow- 

 ered ; lemma not hairy B. polyanthus 



(2) Panicle drooping; glumes hairy; lemma 



densely silky B. Porteri 



Bouteloua Lagasca 1805 Grama Grass 



(Named for Boutelou, a Spanish botanist) 



PI. 46, fig. 2, 3. 



Spikelets 1-2-flowered, 2-rowed on the flat axis of a 1-sided spike; axis 

 of the spikelet extending beyond the base of the flower and bearing 1-3 awns 

 and 1-3 tiny scales; glumes acute, keeled; lemma broader 3-toothed, teeth 

 awned, palet entire or 2-toothed ; annual or perennial. 

 1. Spikes 1-6, erect or spreading, 1-5 cm. long; stems 

 2-20 in. high 

 a. Glumes hairy 



