MANUAL OF THE GRASSES OF THE UNITED STATES 55 



34. Bromus madritensis L. (Fig. 53.) Resembling B. rubens but 

 the culms smooth below the less dense panicles ; 

 sheaths mostly smooth; blades puberulent or 

 glabrous; panicle 5 to 10 cm long, oblong-ovoid 

 (in dried specimens more or less fan-shaped) ; 

 lemmas a little longer than in B. rubens, the 

 teeth 2 to 3 mm long; awn rather stout, 16 to 



22 mm long. Q Open ground and waste FIGURE 52.-Distributkm of 



places, Oregon and California; less common Bromus rubens. 



than B. rubens. Occasionally cultivated for ornament. 



35. Bromus tectorum L. DOWNY CHESS. (Fig. 54.) Culms erect 



or spreading, slender, 30 to 60 cm tall; sheaths and blades pubescent; 



panicle 5 to 15 cm long, rather 

 dense, soft, drooping, often pur- 

 ple; spikelets nodding, 12 to 20 

 mm long; glumes villous, the 

 first 4 to 6 mm long, the second 

 8 to 10 mm long; lemmas lance- 

 olate, villous or pilose, 10 to 12 

 mm long, the teeth 2 to 3 mm 

 long; awn 12 to 14 mm long. 

 O Along roadsides, banks, 

 and waste places, common on 

 the Pacific coast, especially in 

 Washington and Oregon, and 

 here and there throughout the 

 United States as far south as 

 Virginia and Mississippi (fig. 55). 

 BROMUS TECTORUM yar. GLA- 

 BRATUS Spenner. Differing in 

 having glabrous spikelets. O 

 (B. tectorum var. nudus Klett 

 and Richt.) About the same 

 range as the species, less common. 



SECTION 5. NEOBROMUS Shear, as 

 subgenus 



Annual; lemmas lanceolate, 

 deeply bifid, the teeth aris- 

 tate; awn twisted, genicu- 

 late. Approaches Trisetum. 

 36. Bromus trinii Desv. 

 CHILIAN CHESS. (Fig. 56.) 

 Culms 30 to 60 cm or even 100 

 cm tall, erect or branched and 

 spreading below, often pubescent 



,-Br. ra , X .. (Eastwood, Calif., ^ ^ . ^^ ^ y^ 



pilose-pubescent to nearly smooth; panicle 8 to 20 cm long, narrow, 

 rather dense, erect, the branches erect or the lower more or less 



