GRASS FAMILY 101 



attenuate above; awn 3-4 cm. long. River valleys: 111. — Mo. — N.M.— Mont. 

 — Ida. Plain — Suhmont. Je-Au. 



6. E. brachystachys Scribn. & Ball. Stem 3-10 dm. high, smooth; leaf- 

 blades 1-2 dm. long, 6-10 mm. wide, semi-involute, smooth or somewhat scab- 

 rous beneath, finely scabrous above; spike dense, nodding, S-lo cm. long; spike- 

 lets usually in 2's, 3-5-flowcrcd; lemma 11-13 mm. long; awn scabrous, 2-4 cm. 

 long. Prairies and plains: Mich.— Tex.— N.M.— (Black Hills) S.D.; Mex. 

 Plain — Suhmont, Je-Au. 



7. E. striatus Willd. Stem 3-9 dm. high; leaf-blades 1-2 dm. long, 4-10 

 mm. wide, smooth or slightly scabrous beneath, pubescent above; spike ex^scrtod, 

 nodding, 6-12 cm. long; spikclets divergent, 1-3-flowered; lemma about 6 mm. 

 long, hispid; awn 1.5-3 cm. long. Woods and river banks: Me. — N.C. — Tex. 

 N.D. Plain — Suhmont, Je-Au. 



8. E. vulpinus Rydb. Stem 5-7 dm. high, striate, erect; leaves 1-1.5 dm. 

 long, 2-6 mm. wide, scabrous on the margins; spike exsertecl, 1-1,5 dm. long, 

 6-7 mm. thick, slightly nodding; spikelets 1-2 at each node, 4-6-flowered; lem^ma 

 linear-lanceolate, 8 nmi. long; awn 8-10 mm. long. Meadows; Alta.— Neb. 

 Plain. Jl-Au. 



9. E. angustUS Trin. Stem 4-10 dm. high, striate, smooth; leaf-blades 

 rigid, 7-15 cm. long, 3-6 mm. wide, smooth beneath, scabrous above, with in- 

 volute margins; spike rather slender, its base enclosed in the upper sheath; 

 spikelets in pairs, 2-3-flowered, erect-appressed; lemma lanceolate, acuminate, 

 8-10 mm. long; awn scabrous, 4-6 mm. long. Banks: Wyo.— Ida.; Asia. Suh- 

 mont, Je. 



10. E. fflaucus Buckley. Stem 6-10 dm. high, smooth; leaf -blades flat, 

 scabrous on both sides, 6-15 mm. wide, 5-20 cm. long; spike erect, 6-15 cm. long, 

 5-8 mm. thick; spikclets in pairs, rarely in threes or single, 3-4-flowcred ; lemma 

 scabrous towards the apex, 5-nerved, 7-10 mm. long, with a white margin, or 

 in var. tenuis Vasey [E. americanus Vasey & Scribn.] narrower and with purplish 

 mart^in; awn scabrous, 7-15 mm. long. Among bushes and in meadows: Mich. 

 —x!'M.— Calif.— B.C. Submonf.^Subalp, Je-Au. 



11. E. marginalis Rvdb. Stem 6-10 dm. high, glabrous or pubescent at 

 the nodes; leaf-blades 1-2 dm, long, 7-10 mm. wide, flat, scabrous beneath, 

 usually pilose above; spike 1.5-2 dm. long; spikelets usually in pairs, 4-5-flowered; 

 lemma 10-12 mm. long, glabrous and shining; awns 8-20 mm. long. Lake shores 

 and banks : B.C. — Wash. Suhmont.— Mont, Je- Jl. 



12. E. nitidus Vasey. Stem 7-10 dm. high, stout and leafy; leaf-blades 

 1.5-2 dm. long; spike about 1 dm. long, erect; spikelets 1-2 at each node, 3-5- 

 flowered; lemma about 1 cm. long, obscurely 5-nerved, smooth or nearly so, 

 shining; awn scabrous, of about the^same length. Mountains: Ore.— Wyo. — 

 B.C. Suhmont,— Mont, Jl-Au. 



13. E. Petersonii Rydb. Stem 6-S dm. high, slender, glabrous; leaf-blades 

 flaccid, 1-1.5 dm. long, 4-5 mm. wide, light green, minutely scabrous on both 

 sides or sparingly pilose above; spikelets in pairs or single; lemma about 1 cm. 

 long;'awTi about 1 cm. long. Mountains: B.C. (Selkirk :^Its.) Mont. Au. 



14 £. Saundersii Vasey. Stem 6-10 dm. high, smooth; leaf-blades 12-20 

 cm long becoming involute, finely scabrous; spike 12-18 cm. long, somewhat 

 nodding; spikelets usually in pairs, 2-4-flowered; lemma lanceolate, 5-nerved, 

 finely scabrous, 10 mm. long. Mountains: Colo. Mont, 



Voc^-ir ft+pm S-iO dm. hiffh. smooth: leaf-blades erect. 



Macounii vasey. 

 '-1.^ cm. lone. 2^ 



8-10 



5-nerved. Meadows: ^vlan.—X.M.— Utah— Alta, PlainSuhmonL 



16 E curvatus Piper. Stem erect, 6-10 dm. high, glabrous; leaf-blades 

 1-2 dm long 5-7 mm. wide, usually flat, scabrous on both sides; spike stout, 

 erect short-exserted, 5-12 cm. long; lemma 3-5-nerved, sparmgly scabrous- 

 hispidulous towards the apex, 8-12 mm. long, acummate to short-au-ned; awn 



