21 



5. BROMUS PATTJLUS M. & K. in Roehl. Deutsfh. Fl. 1:684. 1823. Serror 

 /a/«(.s>;)a/»/Hs Pari. Fl. Ital. 1:394. 1848. (Fig. 5.) 



An annual or biennial with culms smooth, erect, or somewhat geniculate at the base, 

 about 4-6 dm. high. Sheaths softly pubescent; ligule 2-3 mm. long, subtrun- 

 cate, laciniate-dentate; blades linear-lanceolate, pubescent throughout. Pan- 

 icle 12-20 cm. long, very broadly pyramidal, diffuse, somewhat drooping; lower 

 branches 3-5, slender, smooth; spikelets on slender pedicels, drooping, lanceo- 

 late to ovoid-lanceolate, terete at first, 2-2.5 cm. long, 5-6 mm. broad, becom- 

 ing somewhat laterally compressed at maturity, smooth throughout; empty 

 glumes rather broad, the 

 lower narrower, acute, 

 3-nerved, 4-6 mm. long; the 

 upper obtuse, 5-nerved, 6-8 

 mm. long; flowering glume 

 9-nerved, the marginal ones 

 faint, 7-9 mm. long, broad, 

 obtuse, with a hyaline mar- 

 gin obtusely angled above the 

 middle and an emarginate 

 apex; awn 8-10 mm. long, 

 stout, somewhat tivisted and 

 strongly divaricate at maturity, 

 inserted below the apex; 

 palea conspicuously shorter 

 than its glume. 



Type from Austria. 



Introduced in this country in a 

 few places. 



Specimens examined. — Massa- 

 chusetts: waste ground, Bos- 

 ton (C. W. Swan). South 

 Dakoliu. Brookings (T. A. 

 Williams). Colorado: Fort 

 Collins (L. H. Pammel). 



A species intermediate between 

 B. arvensisa,ndB. squarrostis. 

 From the former it is dis- 

 tinguished by its somewhat 

 larger, more compressed 

 spikelets, rather stouter 

 awn, strongly divergent at 

 maturity, and earlier flower- 

 ing period. From the lat- 

 ter it is distinguished by its 

 narrower spikelets, larger 

 panicle, and less conspicuous angle at the margin of the flowering glume. Per- 

 haps but a variety of B. arvensis. 



6. BROMUS SaUARROSUS L. Sp. PI. 1 : 76. 1753. Serrafalms squarrosus Bab. 



Man. Brit. Bot. 375. 1843. (Fig. 6.) 

 A more or less tufted annual, 2-4 dm. high with a short, somewhat nodding panicle and 

 densely soft pilose sheaths. Culms erect or slightly geniculate at the base, smooth. 

 Sheaths densely retrorsely pilose-pubescent; ligule about 1 mm. long; blades 

 linear, about 8-15 cm. long, 3-5 mm. wide, softly pubescent on both sides. Pan- 

 icle usually 6-12 cm. long, open, branches ascending or drooping, frequently flex- 



FiG. 5. — Bromus patulus : a, empty glumes; 6, flowering 

 glume. 



