320 



MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



as the lemma; rachilla hairs scant, ex- 

 tending to about 3 mm, % — Dry 

 rocky soil, New York, Pennsylvania, 

 Virginia (Luray), and West Virginia. 

 Apparently flowering irregularly or 

 rarely. 



11. Calamagrostis perplexa Scribn. 

 (Fig. 433.) Culms slender, 90 to 100 

 cm. tall, with slender rhizomes; lower 

 sheaths overlapping and with reduced 

 blades, the others shorter than the in- 

 ternodes, minutely scaberulous, to- 

 mentose at the sides of the collar; 

 ligule 3 to 5 mm. long; blades (except 

 the lower) 15 to 35 cm. long, 3 to 6 



Figure 



433- 



floret, 



Calamagrostis perplexa. Glumes and 

 X 10. (Metcalf 5668, N. Y.) 



cm. long; glumes 4 to 6 mm. long, 

 scaberulous; lemma slightly shorter 

 than the glumes, toothed at apex, the 

 awn from near base, about as long as 

 the lemma, bent and protruding from 

 side of glumes ; palea about as long as 

 the lemma ; callus hairs in tufts at the 

 sides, rather scant, nearly half as long 



i'igtjre 435. — Calama- 

 grostis lacustris. 

 Glumes and floret, X 

 10. (Type.) 



Figure 436. — Calama- 

 grostis f ernaldii . 

 Glumes and floret, -X 

 10. (Fernald 427, 

 Maine.) 



Figure 434. — Calamagrostis insperata. Panicle, X 1; 

 glumes and floret, X 10. (Type.) 



mm. wide, scabrous; panicle 10 to 15 

 cm. long, 2 to 3 cm. wide, many- 

 flowered but rather loose, the axis 

 smooth except toward the apex; spike- 

 lets 3.5 to 4 mm. long, the glumes 

 nearly equal, acuminate, scaberulous; 

 lemma 3.5 mm. long, acuminate, the 

 awn from near the base, about as long 

 as the lemma; palea and callus hairs 

 about three-fourths as long as the 

 lemma, the hairs in 2 rather dense 



