HOW TO KNOW THE GRASSES 



31b. Lemma bearing a copious tuft of white hairs attached to the cal- 

 lus; tall perennial with stout rhizomes. Fig. 216. 



SAND REEDGRASS Calamovilia longiiolia (Hook.) Scribn. 



Figure 216 



Perennial; culms 50 — 180 cm. tall, in 

 small tufts; plants producing long, tough, 

 scaly rhizomes; panicles large, 15 — 35 cm. 

 long; lemmas bearing copious tufts of 

 straight white hairs on the callus. The 

 plants are coarse and tough, but make 

 considerable amounts of winter feed and 

 are sometimes cut for hay. Sandy soil, 

 hills and plains; shores of Lake Huron and 

 Lake Michigan. August — September. 



Calamovilia gigantea (Nutt.) Scribn. & 

 Men. is similar but larger, and has hairs 

 on the backs of the lemmas. Sand dunes 

 of the great plains and southwestern states. 



32a. Glumes with long awn-tips, or the lemmas long-awned from the 

 tip; panicles dense; rhizomes densely covered with overlapping 

 scales 42 



32b. Glumes not awned; lemmas awnless or owned from the back; pani- 

 cles open or dense; rhizomes, if present, not covered with over- 

 lapping scales 33 



33a. Palea at least half as long as the lemma; plants often with rhi- 

 zomes or stolons 34 



33b. Palea absent or less than Va, as long as the lemma; plants tufted, 

 lacking rhizomes or stolons 36 



34a. Plants with erect stems; panicles open, pyramidal, 



35 



115 



