WOOTON AND STANDLEY FLOEA OF NEW MEXICO. 



47 



Plants without stolons; spikelets few, 

 scattered; spikes scattered 



along the central axis 47. Schedonardus (p. 85). 



One to several sterile lemmas above the 

 perfect florets. 

 Spikes scattered along the central 



axis 48, BouTELOUA (p. 85). 



Spikes digitate, or crowded near the 

 end of the stem. 

 Lemmas with a single awn or 



awnless 49. Chloris (p. 87). 



Lemmas 3-awned 50. Trichloris (p. 88). 



Tribe IX. FESTUCEAE. 



Lemmas with numerous (9 or more) awnlike divisions 



or awned lobes 51. Pappophorum (p. 88). 



Lemmas with few lobes or entire. 



Lemmas, at least those of the pistillate spikelets, 



3-lobed and 3-awned 52. Scleropogon (p. 89). 



Lemmas entire or at most 2-lobed. 



Hairs on the rachilla or lemma very long, ex- 

 ceeding the lemma in length. 



Rachilla hairy; lemma naked.'. 53. Phragmites (p. 89). 



Rachilla naked; lemma hairy 54. Arundo (p. 89). 



Hairs, if any, on the rachilla and lemma 

 shorter than the latter. 

 Stigmas barbellate, on long styles; spike- 

 lets in 3's in the axils of the spin- 

 escent leaves; plants spreading, 



woolly when young 55. Munroa (p. 90). 



Stigmas plumose, sessile or on short styles; 

 spikelets and plants various. 

 Lemmas 1 to 3-nerved. 



Lateral nerves of the lemmas 

 hairy. 

 Lemmas deeply 2-lobed. . . .56. Dasyochloa (p. 90). 

 Lemmas entire or b ut slightly 

 2-lobed. 

 Inflorescence a short 

 crowded raceme; 

 leaf blades with 

 cartilaginous mar- 

 gins ; plants low 



and tufted 57. Erioneuron (p. 90). 



Inflorescence a rather 

 large panicle : leaf 

 blades withoiit 

 cartilaginous mar- 

 gins; plants tall.. 58. Tridens (p. 91). « 

 Lateral nerves of the lemmas 

 glabrous. 

 Second glume very unlike 

 the first, broadened 

 upward 59. Sphenopholis (p. 92). 



