90 POACEAE 



7. B. paniculatus (Shear) Rydb. Tall leafy perennial; stem 6-10 dm. 

 high; leaf-blades 2-3 dm. long, 8-12 mm. wide, scabrous; panicle 2-3 dm. long; 

 spikelets loosely 5-7-flowered, 2-3 cm. long, 6-7 mm. wide; empty glumes ob- 

 tu.se, glabrous; lemma glabrous, 11-14 mm. long, scariou.s-margined, acute. B. 

 polyanthus paniculatus Shear. Mountain meadows: Colo. — N.M. — Ariz. — 

 Utah. Suhtnonl. Jl-Au. 



8. B. unioloides (\Yilld.) H.B.K. Stout, more or less tufted annual; stems 

 3-10 dm. high, glabrous; slieath pilose-pubescent, rarely glabrous; panicle 1.5-3.5 

 dm. long; branches ascending or spreading; spikelets 2-3.5 cm. long, 5-9 mm. 

 broad, 7-11 -flowered; empty glumes smooth or slightly scabrous; lemma broadly 

 lanceolate, acute, nearly glabrous to strongly scabrous, 13-16 mm. long; awn 

 usually present, 2 mm. long or less. Fields, prairies, and waste places: Fla. — 

 Colo.— Calif. Son. Ap-Au. 



9. B. brizaeformis Fisch. & Mey. Stem 3-6 dm. high, glabrous or slightly 

 pubescent at the nodes; leaf-blades pubescent on both sides, 5-10 cm. long, 2-5 

 mm. wide; panicle 5-25 cm. long, lax, secund, nodding; spikelets 15-25 mm. 

 long, ovate; empty glumes obtuse, smooth or minutely scabrous; lemma about 

 1 cm. long, very broad, smooth or minutely scabrous, broadly scarious-margined. 

 Waste places and fields: Mass. — -Del. — Calif. — B.C.; adv. from Eurasia. Plain 

 — Submont. Je-Jl. 



10. B. secalinus L. Stem 3-7 dm. high, smooth or pubescent at the nodes; 

 leaf -blades 1-2 dm. long, sparsely j^ubescent above, glabrous beneath; panicle 

 8-18 cm. long, at first erect, droo])ing in fruit; spikelets 10-18 mm. long, 6-8 

 mm. broad; lemma 6-8 mm. long, obtuse, smooth or scabrous, its margins strongly 

 incurved in fruit; awn 3-5 mm. long. Cheat. Fields and waste places: Me. — 

 Fla. — Calif. — ^Wash.; nat. from Eu. Plain. Ap-Au. 



11. B, racemosus L. Stem 3-7 dm. high, scabrous-puberulent under the 

 inflorescence and pubescent at the nodes; leaf -blades 7-14 cm. long, pilose- 

 pubescent; panicle simple, somewhat nodding; spikelets 15-20 mm. long, 5-9- 

 ilowered, acute; lemma smooth or scabrous, 6-8 mm. long, very shortly bidentate 

 at the apex; awn 5-8 mm. long, straight. Waste places: N.S. — G&. — -N.M. — 

 Ore. — Wash. — ^Yukon; adv. from Eu. Plain — Suhmonl. Je-Au. 



12. B. patulus Mert. & Koch. Stem somewhat geniculate at the base, 

 4-6 dm. high; leaf -blades pubescent, 4-10 cm. long, 2-4 mm. wide; panicle 12-20 

 cm. long, diffuse, somewhat drooping; spikelets 2-2.5 cm. long, 5-6 mm. wide; 

 lemma 7-9 mm. long, hyaline-margined, emarginate, glabrous. Waste places: 

 Mass. — Colo. — S.D.; adv. from Eu. Plai7is. Je-Jl. 



13. B. hordeaceus L. Stem 2-8 dm. high, usually somewhat pubescent; 

 leaf-blades 5-15 cm. long, 3-5 mm. broad, pilose or glabrate; panicle contracted, 

 5-10 cm. long; spikelets 5-13-flowered, 12-15 mm. long, 4-6 mm. wide; lemma 

 obtuse, coarsel}' pilose, 8-9 mm. long; awn stout, 6-9 mm. long. B. viollis L. 

 Hairy Cheat. Waste places, roadsides, fields: Me. — -N.C. — -Calif. — B.C.; nat. 

 from Eu. Plain — Submont. My-Jl. 



14. B. eximius (Shear) Piper. Stem slender, 8-11 dm. high, somewhat 

 pubescent, at least at the nodes; sheaths pilose; leaf-blades 1.5-2.5 dm. long, 

 5-9 mm. wide, thinly pilose above; panicle 8-12 cm. long, nodding; spikelets 

 few, 15-25 mm. long, 3-4 mm. wide; lemma 8-10 mm. long, sparsely ])ubescent 

 on the back, ciliate near the margins. B. vulgaris Shear, in i)art. Wet places: 

 B.C.— Mont.— Wyo.— Calif. Submont. Jl-Au. 



15. B. Porteri (Coult ) Nash. Stem 5-9 dm. high, pubescent at the nodes; 

 sheaths usually s{)aringly short-pilose; leaf-blades 7-30 cm. long, 3-5 mm. wide, 

 scabrous; j)anicle 1-2 dm. long, drooping; spikelets 2-2.5 cm. long, 7-9-flowered ; 

 lemma 11-13 mm. long, coarsely pubescent, the apex hyaline, slightly emarginate; 

 awn 2-4 mm. long. Hillsides and meadows: Man. — N.M. — -Ariz. — Alta. Plain 

 — Subalp. Je-Au. 



16. B. latiglumis (Shear) Hitchc. Stem 6-10 dm. higli, very leafy, slightly 

 pubescent at the nodes or glabrous; leaf-blades 1-3 dm. long, 5-8 mm. wide, 

 scabrous and sometimes sparingly hairy above, with conspicuous auricles at the 



