478 POACE.E. 



Poa hypnoides Lam. Tabl. Encycl. 1:185 (1791). Poa reptans 

 Michx. Fl. Bor. Am, 1:69 (1803). Eragrostis reptans Nees, 

 Agrost. Bras. 514 (1829). 



Prostrate and creeping annuals, culms much-branched, 5-30 cm. 

 long, ligule a ciliate ring; blades flat or involute, 1-5 cm. long, 1-2 

 mm. wide. Panicle ovoid or jayramidal, 3-6 cm. long, or capitate. 

 Spikelets flat, elliptical, ovate or linear, imperfectly dioecious, almost 

 sessile or even capitate, 10-40-flowered, 5-14-22 mm. long; empty 

 glumes acute, 0.5-1 mm. long; floral glume broadly ovate, acute, 

 1.8-2.2 mm. long, with lateral nerves obscure or prominent; palea 

 shorter than its glume, ciliate on the keels. Grain oval, com- 

 pressed, 0.7-0.8 mm. long. 



U. S. Dejjt. Agricul. 591; Illinois, Canhy in 1868; Florida, 

 Chapman; Texas, Palmer 1369, Nealley; Oregon, Hall 631; Cali- 

 fornia, Pringle in 1882. 



Very variable in size, mode of growth, and arrangement of 

 spikelets. 



In some the geniculate stems are 60 or more cm. long, with in- 

 ternodes 10 cm. long. In No. 431, T. J. Howell, Oregon, the 

 spikelets are in very large numbers (hundreds) in a tuft 8-10 cm. 

 diam. 



Wet places, New England to Oregon and Texas. 



2. E. Vahlii (R. & S.) Nees, Agrost. Bras. 2: 499 (1829). Poa 

 Vahlii R. & S. Syst. 2: 563 (1817). K amcena Presl, Rel. Hank. 

 1: 275 (1830). Megastachya amcena Fourn. Hemsl. Biol. Centr. 

 Am. Bot. 3:572 (1880). 



An erect or ascending annual, 5-30 cm. high. Culms simple, 

 branching below. Sheaths sliglitly compressed, striate, pilose at 

 the throat; blades flat, attenuate-acuminate, smooth above, usually 

 pilose. Panicle 3-10-15 cm. long, spikelike or with rays more or 

 less remote and spreading, bearing spikelets to the base. Spikelets 

 nearly sessile, crowded, erect or spreading, 5-25 mm. long, linear 

 or hnear-oblong, much compressed, lO-50-flowered; empty glumes 

 lanceolate, subequal, about 2.5 mm. long, scabrous on the keel; 

 floral glume 2.3-2.7 mm. long, ovate, acuminate, nerves distinct, 

 keel scabrous above; palea incurved, a third shorter than its glume, 



