482 POACEiE. 



numerous, brancliing, capillary, stiff, mostly naked in the axils. 

 Spikelets mostly single on long pedicels, 1-4 cm. long, oval, green- 

 ish or tinged with purple, scarcely flattened, 2-4-flowered, 2.5-3.5 

 mm. long; empty glumes subequal, acute, 1-nerved, 1-1.3 mm. 

 long; floral glume ovate, obtuse when spread, obscurely 3-nerved, 

 1.5 mm. long; palea incurved, 3-toothed, ciliate on the keels. 



Massachusetts, Cooley; District of Columbia, McCarthy; Ten- 

 nessee, Gattinger; Florida, Curtiss 3499. 



New England to Texas. 



10. E. Eraurostis (L.) Karst. Deutsch. FI. 389 (1880-83). 

 Poa Eragrostis L. Sp. PL 68 (1T53). E. minor Host, Fl. Austr. 

 1: 135 (1827). E. jjomides Beauv. Agrost. 162 (1812). 



Annual; culms variously spreading or erect, 10-25 cm. high. 

 Blades flat, smooth, 1-15 cm. long, 1-2.5 mm. wide, the margins and 

 glumes containing more or less glands secreting an offensive sub- 

 stance. Panicle ovoid or linear, rather dense, 5-15 cm. long. 

 Spikelets flat on short pedicels, oblong-linear, lead-colored, 8-20- 

 flowered, 4-10 mm. long; floral glume broadly oval and obtuse 

 when spread, 1.5 mm. long, lateral nerves prominent, keel usually 

 smooth, sometimes glandular; palea oval, ciliate on the nerves. 

 Grain globular-oval or ovoid, 0.6 mm. long. 



Sandy waste places, eastward, perhaps elsewhere. Introduced 

 from Europe. 



Mexico, Schaffner 1027. 



11. E. interrupta (Xutt.) Trelease; Branuer & Coville, Pep. 

 Geol. Surv. Ark. 1888, Part. 4, 237 (1891). Poa i7iterruptals ntt. 

 Trans. Am. Phil. Soc. (II.) 5: 146 (1837). E. oxylejns Torr. Kept. 

 Bot. Whipple Exped. 156 (1856). 



A tufted erect slender annual or perennial, 15-50 cm. high. 

 Sheaths smooth; ligule very short, often bearded; blades rigid, be- 

 coming involute, 10-20 cm. long, 2-3 mm. wide. Panicle race- 

 mose, capitate or spikelike with interrupted clusters, often tinged 

 with light purple, 4-12 cm. long, 1-3 cm. diam. S]iikelets on shoii; 

 pedicels or nearly sessile, much flattened, linear or elliptical, 15-30- 

 flowered, 10-16 mm. long; empty glumes lanceolate, 1-nerved, first 

 2mm. long, second 2.5-3 mm long; floral glume ovate-lanceolate. 



