GRASS FA.MILY 69 



Plant extensively creeping, rooting at the nodes; plant dioecious. l. E humwiilfs 



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



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



Spikelets^about 3 mm. broad; first en.pty glume only slightly shorte? than the 



^'''^''"'slcond:^ "™- ^'■''^'^' ''"* ^"""'^ ^'""^^ •'"'^' two-thi?d.s^as'To"r^'"the 

 ^""S'Srlead^cdlored"*'*'^" *' '^'* "'°''*' "' ^""^^ spread_ing. spik.lets dark 



^""yehoS green'''''' '''"^"'^'^^^^ ^'"'^'^^ °'' st^-^nKly ascending; spikolo(s' light 



Perennials, rigid, erect, often tufted. "*• ^- '«'"''''"*■ 

 Spikelets scattered on the long branches. 



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



Branches of the panicle erect or strongly ascending. pecimacea. 



Spikelets 3-9-flowercd, on pedicels much longer. 6. E trichoma 



Spikelets 8-15-flowered. on pedicels scarcely as long. 7. E neo^Zficana 



Spikelets clustered on short branches. *" g. e\ se^Zfflora 



1. E. hypnoides (Lam.) B.S.P Stem .^5-45 cm. long, branclied, gbhrous: 

 floral branches erect, 3-lo cm. high; leaves about 5 cm. long or Ic':' 1-'' mm 

 wide, fiat; spikelets lO-po-flowereci, 4-15 mm. long; empty glumes unequal, the 

 hrst one-half to two-thirds as long as the second; lemma about 2 5 mm lone- 

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

 of the staminate ones. E. replans Xees. Sandv or gravelly shores- Vt — Ont 

 -Neb.-X.M.~Fla.-B.C.-Ida.-Calif .; Mex., W. Ind. Plali-SuLoaL 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 o-lo cm 

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

 lemma obtuse, 2-2.5 mm. long. E. major Host. Stixk Grap?. Wa^te nlaces 

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

 Plain — Submont. J\Iy-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. Drj- 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 



1''%'?'^ """,'■ r /' ?""*'■ P'^u'^'^f narrow 4-7 cm. long; spikelets 2-3 mm. long, 

 3-1 2-flowered; first glume about 1 mm. long, the second 1.3 mm. long; lemma 

 obtuse, about 2 mm. long, 3-nerved. Sandy banks: Wash.— Lla.— Nev. Son. 



6. E. pectinacea (Alichx.) Steud. Stem 3-8 dm. high, erect ri2i<l- leaf 

 I'^^'^f/"^,'^"'- ^«"g',^-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 lono- 

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



.u ®\^,- *f',??°i'^®^, i^v"*i-^ ^^^-n *?''" ^^^. '^"'- ^'^^' ^^^^"is pilose at the 

 throat; leaf-blades l.o-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 fiat, 4-10 mm. broad; panicle oblong, 2-4 dm. lone open* 

 spikelets 5-8 mm. long, 8-1 a-flowered; lemma Iiispidulous on the keel near the 

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

 Mountain sides: w Tex. — s Utah — Calif.; n Mex. San, 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 &-40- 

 fiowered, &-20 mm. long, 3-5 mm. wide; empty glumes acute, equal; flowerine 

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

 Mo.— La.— Tex.— N.M.— Colo.: Mex, Son, Au-S ^ ^ ' 



