274 



POACE^. 



1. H. ALOPECUROiDES Host, Gram. 1 : 23 t. 29 (1801). Crypsis 

 alopeciiroides Schrad. Fl. Germ. 1: IGT (1806). 



Culms geniculate, 7-20 cm. high. Sheaths about half as long as 

 the internodes; ligule a fringe of hairs; blades scabrid above, soon 

 involute, 2-4 cm. long, 2-3 mm. wide. Spike exserted, 1-4 cm. 

 long, 4-5 mm. diam. Spikelets oval or cuneate-obovate, about 2 

 mm. long, empty glumes 1-nerved; floral glume longer, incurved, 

 1-nerved; jaalea deeply 2-lobed. 



Sparingly introduced along the coast on ballast. 



2. H. SCHCENOIDES L. Host, Gram. 1:23, ^.30(1801). Plileum 

 schcenoides L. Sp. PI. 60 (1753). CryjJsis schcenoides Lara. Tabl. 

 Encycl. 1:166 (1791). 



Culms 7-20 cm. high. Slieaths inflated, less than half the 

 length of the internodes; ligule a fringe of hairs; blades scabrid 

 above, soon involute, 2-4 cm. long, 2-3 mm. wide. Spikes termi- 

 nal and axillary, wholly or Avith bases included in the sheaths, 

 0.5-2 mm. long, 4-5 mm. diam, Spikelets ellii^tical or obovate. 



Fig. 49. — HeleoMoa schcenoides. A, spikelets; a, b, empty glumes. (Richardson.) 

 about 2.5 mm. long; empty glumes 1-nerved, about 2 mm. long; 

 floral glume and palea subequal, the latter emarginate. 



Sparingly introduced along the coast on ballast. Our plants 

 were collected on waste ground near Philadelphia. 



56. (122). Phleum L. Sp. PL 59 (1753). L. Syst. Ed. 1 (1735). 

 ^Stelephuros Adans. Fam. 2:31 (1763). Achnodonton Beauv. 

 Agrost. 24, t. 7,/. 5 (1812). Chilochloa\. c. 37, t. 7,/. 2 (1812). 



