GRASS FAMILY 91 



base; panicle 1-3 dm. long, open, somewhat nodding; spikelets 2-3 cm. long, 

 loosely 6-10-flo\vered; lemma about 1 cm. long, broadly lanceolate, pilose, densely 

 so toward the base; awn 4-5 mm. long. B. purgans latiylumis Shear. Mead- 

 ows: Conn. — -Pa. — ^lo. — Neb. — Mont. Plain. Je-Au. 



17. B. purgans L. Stem 7-14 dm. high, glabrous or pubescent at the 

 nodes; leaf-blades 1.5-3 dm. long, 5-15 mm. wide, somewhat auricled at the 

 base, short-pilose on the veins above, scabrous or smooth beneath; panicle lax, 

 nodding, 1.5-2.5 dm. long; spikelets 7-14-flowered, 2-2.5 cm. long; lemma acute, 

 10-12 mm. long, sparsely pubescent across the back; awn 4-6 mm. long, straight. 

 Woods and .shady I)anks: Que. — ^Ga. — Okla. — -Wyo. Plain — Submoni. My-Jl. 



18. B. lanatipes (Shear) Rydb. Stem 4-10 dm. high, smooth, or pubescent 

 at the nodes; leaf-blades 2-3 dm. long, 5-7 mm. wide, scabrous on both sides; 

 panicle open, 2-3 dm. long; branches ascending; spikelets 2-3 cm. long, 7-11- 

 flowered; lemma about 1 cm. long, obtuse, emarginate; awn 4-5 mm. long. Hill- 

 sides: Colo. — ^N.M. — -Calif. Submoni. — Monl. Jl-Au. 



19. B. ciliatus L. Stem 6-13 dm. high, glabrous; leaf-blades 1.5-2.5 dm. 

 long, 5-12 mm. wide, mostly scabrous above, glabrous beneath; panicle large, 

 drooping, 1.5-2.5 dm. long; .sjiikelets 2-3 cm. long, 6-11-flowered; lemma obtuse, 

 emarginate, 12-15 mm. long; awn 3-5 mm. long, straight. B. Richardsoni Link. 

 Meadows and hillsides: Sask.— N.M.^Ariz.— Ore. — B.C. Plain — Subalp. 

 Je-Au. 



20. B. Pumpellianus Scribn. Stem glabrous, or pubescent merely at the 

 nodes; leaf-blades 1-2 dm. long, 5-10 mm. wide, smooth beneath, scabrous or 

 slightly pubescent above, auricled at the base; spikelets erect, 7-11-flowered, 

 2-3 cm. long, 5-7 mm. wide; lemma 10-12 mm. long, coarsely ciliate along the 

 margins and across the back at the base. Meadows and hillsides: Sask. — S.D. 

 — Colo. — ^B.C. — Alaska. Subniont. — Mont. 



21. B. inermis Leyss. Stem 5-10 dm. high; leaf-blades smooth and glab- 

 rous, 1.5-2.5 dm. long, .5-10 mm. wide; panicle 1-2 dm. long; spikelets 2-2.5 cm. 

 long, 4r-5 mm. wide; lemma 9-12 mm. long, obtuse, emarginate, typically glab- 

 rous. Fields and meadows: Man. — Ohio — N.M. — ^Wash. — -Mont. ; escaped from 

 cultivation. Je-Au. 



22. B. tectorum L. Stems 3-6 dm. high, glabrous; leaf-blades mostly 

 pubescent throughout; panicle 6-15 cm. long; spikelets 13-20 mm. long; lemma 

 lanceolate, scabrous-puberulent to piloss-pubsscent, 11-13 mm. long, narrowly 

 2-toothed at the apex; awn straight, 13-15 mm. long. Waste places and sandy 

 soil: Mass. — Va. — Miss. — Colo. — -Calif. — B.C.; adv. or nat. from Eu. F^lain — • 

 Submoni . My-Jl. 



23. B. sterilis L. Stem erect or ascending, 5-10 dm. high; leaf -blades 

 pubescent throughout; panicle 1-2 dm. long, lax, open; spikelets 25-3.5 cm. 

 long, 6-10-flowered; empty glumes lance-subulate, the first 7-9 mm. long, the 

 second 11-13 mm. long; lemma linear-lanceolate, 12-16 mm. long, scabrous; 

 awn stout, very rough. Waste places: Mass. — -D.C. — -Colo. — Wash. — B.C.; 

 adv. from Eu. Plain — Submoni. My-Jl. 



24. B. maximus Desf. Stem 2-4 dm. high, smooth; leaf-blades flat, 3-5 

 mm. broad, jjilose on both sides; panicle erect, somewhat secund, 5-10 cm. long; 

 spikelets 5-7-flowered, 3. .5-5 cm. long, exclusive of the awns; lemma 5-nerved, 

 2..5-3 mm. long, harshlv scabrous, 2-toothed at the apex. Waste places and 

 fields: Cahf.— Wash.— Ida.- B.C.; alv. from the Old World. 



71. LOLIUiM L. Darnel, Rye-grass. 

 Perennials with rootstocks, or annuals, with terminal 2-sided spikes. Spike- 

 lets with the edge towards the rachis, compressed, several-many-flowered; 

 flowers perfect or the upper ones imperfect ; rachilla articulate between the flow- 

 ers. Emjity glumes in the terminal sjiikelet 2, in the lateral spikelets 1, facing 

 the rachis, the inner one lacking. Lemma shorter and broader than the empty 

 glume, rounded on the back. Palet shorter than the lemma, 2-keeled. Styles 

 distinct, short; stigmas plumose. 



