GRASS FAMILY 69 



Plant extensively croepiiis;, rooting ai the nodes; plant dioecious. 1. E. hypnoides 



Plant not creepint;, not rool ini; at the nodes: liowers ijerfeel. 



Annuals, niiieh branched, ascending or tlectunhent and ficniculato at tiie ba.se. 



Spikelets about .i mm. broad; first empty glume only slightly shorter tlian the 



second. ^ , ^ 2. E. mrc/a.slachya. 



Spikelets 1..D-2 mm. broad; first empty glume only two-thirds as long as the 

 second. 

 Inflorescence open: branches at last more or less spreading; spikelets dark 



green or lead-colored. 3. E. Purshii. 



Inflorescence narrow; branches erect or strongly ascending; spikelets light 

 yellowish green. 4. E. lutescens. 



Perennials, rigid, erect, often tufted. 



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 S-15-flowered, on pedicels scarcely as long. 7. E. nen-mexicana 

 Spikelets clustered on short branches. 8. E. secundiflora. 



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

 floral brancheti 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. Sandv or gravelly shores' Vt — Ont 

 — Neb.— N.M.— Fla.— B.C.— Ida.— Cahf .; Mex., W. Ind. Plain— S uhmont .' 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.; Alex.; nat. from Eu. 

 Plain — -Subnionl. 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 — Submont. Je-0. 



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; sjiikelets 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 inu-plish, 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. (?)£'. limbata Fourn. (older name). 

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



8. E. secundiflora Presl. Stems 1..5-10 dm. high, erect, simple; leaf-blades 

 5-30 cm. long, 2-4 nmi. 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 ghunes acute, equal; flowering 

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

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



