SPRING FLORA OF MANHATTAN. 7 



Glumes avvned below the 2-clef t apex ... Bromus 



d. Spikelets sessile on opposite sides of a zig-zag rhachis. 



1 -flowered Hordeum 



3-5-flowered Elymm 



PANTCUM, L. 



Lower glume usually small; third glume empty or staminate; fourth 

 glume coriaceous, enclosing a perfect flower. 



P laxiflbrum, Lam. Resembling the next but spikelets scarcely 2 

 mm. long. Prairie land 



P. scoparium. Lam. Stems usually several, 2-4 dm. high Sheaths 

 hairy. I'anicln about Adm. long Spikelets obovate, obtuse, 3 mm.* 

 long; lower aiume roundish, about one-third the length of the spikelet. 

 Prairie land, common. 



CHAM^ERAPHIS, R. Br.* 



Spikelets as in Panicum but the peduncles bearing a few long 

 bristles below the joint. 



C. viridis. (L ) Porter, Annual, upright; leaves straight (not 

 twisted as in C glauca). Spike 3-10 cm. long, usually somewhat taper- 

 ing upward. A common weed in cultivated ground. 

 ALOPECURUS. L. 



Spikelets 1-flowered; lower glumes boat shaped, about as long as the 

 flowering glume which is avvned on the back below the middle. 

 Inflorescence spike-like. 



A. geniculatus, L. Tufted, 2 4 dm. high, leaves short, the soft spike 

 2-5 cm long, often partly enclosed in the upper sheath. Moist meadows, 

 frequent. 



AGROSTIS, L 



Spikelets 1-flowered. Empty glumes usually longer than the flower- 

 ing one, all without terminal awns. 



A. hiemalis, (Walt) B. S. P. Slender stems tufted, with a few 

 short leaves at base, 3-4 dm high Panicle large, the branches capillary 

 and in fruit very long and spreading. Lower glume acute, about H mm. 

 long. Dry land, common. 



BULBILIS, Raf. 

 Dioecious; staminate spikelets 2-ranked in 1-sided short spikes, 

 2-3 flowered; spikes 1-3 at the summit of the short stem. Pistillate 

 spikelets 1-flowered in a cluster near the ground, each in the axil of a 

 leaf-like bract. 



B. dactyloides, (Xutt.) Raf. A low tufted grass, spreading extensively 

 by stolons. Prairie, frequent. 



EATON I A, Raf 

 Spikelets 2 flowered; empty glumes nearly equal in length but very 

 unequal in shape, lower narrow, upper broad and obovate. 



•It would seem best to retain Setai-ia as a genus distinct from the Australian 

 Vhamaeraphis, but as the name was used earlier for a genus of lichens, a new name 

 should be given. 



