MANUAL OF THE GRASSES OF THE UNITED STATES 107 



ovoid, dense, spikelike, 2 to 5 cm long, 1 to 2 cm wide, pale or pur- 

 plish; spikelets 6 to 10 mm long, about 5-flowered; glumes broad, 



FIGURE 169. Poa arachnifera. Plant and pistillate (9) and staminate (cf) panicles, X 1; pistillate (9) 

 and staminate (c?) florets, X 10. (Blackman, Tex.) 



3- nerved, 4 to 6 mm long; lemmas 6 to 7 mm long, slightly webbed at 

 base, pubescent on the lower part of the keel and marginal nerves, 

 scabrous on the upper part of the keel, usually 

 with 1 to 3 pairs of intermediate nerves. 01 

 Sand dunes near the coast, California, Point 

 Arena to Monterey. 



10. Poa confinis Vasey. (Fig. 173.) Plants 

 dioecious, the two kinds similar; culms often 

 geniculate at base, usually less than 15 cm tall, 

 FIGURE 170. Distribution of sometimes as much as 30 cm; blades involute, 



Jroo, aracnmjera, , ... . 



those of the innovations numerous; panicle 



narrow, 1 to 3 cm long, tawny, the short branches ascending or 

 appressed ; spikelets 4 to 5 mm long, mostly 3- or 4-flowered; glumes 



