GRASS FAMILY $9 



Plant extensively creeping, rooting at the nodes ; plant dioecious. 1 E hurmnifle* 



Plant not creeping, not rooting at the nodes; flowers perfect 



Annuals much branched, ascending or decumbent and geniculate at the base 



Spikelets^about 3 mm. broad; first empty glume only slightly shorter than the 



Spikelets5-2 mm. broad; first empty glume only two-thirds^fong ^the 



dark 

 Inflorescence narrow; branches erect or strongly ascending; spikelets' light 



Perennials^lg^Se^'often tufted. 4 ' E ' lutescens ' 

 Spikelets scattered on the long branches. 



Branches of the panicle widely spreading in age. 5. E. pectinacea 

 Branches of the panicle erect or strongly ascending. 



Spikelets 3-9-flowered, on pedicels much longer. 6. E trichodes 

 Spikelets 8-15-flowered, on pedicels scarcely as long. 7. E. neo-mexicana 



Spikelets clustered on short branches. 8. E. secundiK 



1. E. hypnoides (Lam.) B.S.P. Stem 5-45 cm. long, branched, glabrous- 

 floral branches erect, 3-15 cm. high; leaves about 5 cm. long or less, 1-2 mm! 

 wide, flat; spikelets 10-35-flowered, 4-15 mm. long; empty glumes unequal, the 

 first one-half to two-thirds as long as the second; lemma about 2.5 mm long- 

 lateral veins prominent; glumes of the pistillate spikelets more acute than those 

 of the staminate ones. E. reptans Nees. Sandy or gravelly shores 1 Vt _ Ont 



Neb. N.M.-Fla. B.C. Ida. Calif .; Mex., W. Ind. Plain Submont.' Au-S'. 



2. E. megastachya (Koel.) Link. Stem 1-6 dm. tall; leaf-blades 7-18 cm. 

 long, 2-6 mm. wide, flat, smooth beneath, scabrous above; panicles 5-15 cm. 

 long; spikelets 8-35-flowered, 5-16 mm. long, very flat; empty glumes acute- 

 lemma obtuse, 2-2.5 mm. long. E. major Host. STINK GRASS. Waste places 

 and cultivated grounds: Ont. Fla. Calif. Mont.; Mex.; nat. from Eu. 

 Plain Submoni. My-S. 



3. E. Purshii Schrad. Stem 1-4 dm. tall, smooth; leaf-blades 4-9 cm. long, 

 1-2 mm. wide; panicle open, 7-20 cm. long; spikelets 5-15-flowered, 3-8 mm. 

 long; lemma acute, firm, about 1.5 mm. long. Dry or sandy places: Ont. _ Fla. 



Ariz.; Mex. Plain Submoni. Je-O. 



4. E. lutescens Scribn. Stems 1-2 dm. high, glabrous; leaf -blades 2-5 cm. 

 long, 2-3 mm. wide, flat; panicle narrow, 4-7 cm. long; spikelets 2-3 mm. long, 

 3-12-flowered; first glume about 1 mm. long, the second 1.3 mm. long; lemma 

 obtuse, about 2 mm. long, 3-nerved. Sandv banks: Wash. Ida. Nev Son 

 Jl-S. 



5. E. pectinacea (Michx.) Steud. Stem 3-8 dm. high, erect, rigid; leaf- 

 blades 1-3 dm. long, 4-8 mm. wide, flat, sparingly villous at the base; panicle 

 1.5-6 dm. long, purple or purplish, strongly bearded in the axils; spikelets 5-15- 

 flowered, 3-8 mm. long; empty glumes acute, subequal; lemma 1.75-2 mm. long 

 Dry or sandy soil: N.H. Fla. Tex. N.M. S.D. Plain. Au-S. 



6. E. trichodes (Nutt.) Nash. Stem 6-12 dm. high; sheaths pilose at the 

 throat; leaf -blades 1.5-7 dm. long, 2-4 mm. wide; panicle 2-7 dm. long, narrow; 

 lower axils sometimes bearded; spikelets usually pale, 3-9-flowered, 5-9 mm. 

 long; empty glumes subequal; lemma acute, 2-3 mm. long. Sandy soil: Ohio 

 Ark. Tex. N.M. Neb. Plain Son. 



7. E. neomexicana Vasey. Stem 4-8 dm. high, usually branching near 

 the base; leaf -blades flat, 4-10 mm. broad; panicle oblong, 2-4 dm. long, open; 

 spikelets 5-8 mm. long, 8-15-flowered; lemma hispidulous on the keel near the 

 acute apex; palet one-third shorter, ciliate. (?) E. limbata Fourn. (older name). 

 Mountain sides: w Tex. s Utah Calif.; n Mex. Son. Je-S. 



8. E. secundiflora Presl. Stems 1.5-10 dm. high, erect, simple; leaf-blades 

 5-30 cm. long, 2-4 mm. wide, flat; panicle 4-15 cm. long, the branches erect or 

 ascending; spikelets crowded, sessile or nearly so, strongly flattened, 8-40- 

 flowered, 6-20 mm. long, 3-5 mm. wide; empty glumes acute, equal; flowering 

 glumes 3-3.5 mm. long, acute, usually purple-margined. Dry or sandy soil: 

 Mo La. Tex. N.M. Colo.; Mex. Son. Au-S. 



