50 POACEAE. 



5. B. villosus gussonei (Pari.) Asch. & Graebn. Annual; culms 

 erect or ascending, 4-7 dm. high, smooth; sheaths pilose-pubescent; 

 ligule 3-4 mm. long; leaves linear, 2-3 dm. long, 3-5 mm. wide, pilose 

 on both sides; panicle somewhat drooping, secund, lax, 1-2 dm. 

 long; lower branches 2-4, 3-5 cm. long; spikelets 5-7-flowered, 

 3.5-5 cm. long; empty glumes lanceolate, acuminate, smooth, the 

 first 15-20 mm. long, 1-nerved, the second broader, 25-30 mm. long, 

 3-nerved; flowering glume 5-nerved, 25-30 mm. long, strongly- 

 scabrous, 2-toothed, teeth hyaline, 3-4 mm. long; awn stout, 3.5- 

 4.5 cm. long, rough; palea somewhat shorter than its glume. (B. 

 maximus gussonei Pari.) 



Common along streets and in waste places, a troublesome pest. 



6. B. nibens L. Annual; culms about 2-5 dm. high, erect, 

 puberulent above; sheaths pubescent; ligule 1-2 mm. long, leaves 

 3-15 cm. long, pubescent on both sides; panicle erect, compact, 

 usually purplish, 4-7 cm. long; spikelets mostly 7-11-flowered, 

 2-2.5 cm. long; empty glumes acuminate, pubescent or scabrous, 

 the first narrow, 1-nerved, 7-9 mm. long, the second 3-nerved, 10- 

 12 mm. long; flowering glume 13-16 mm. long, lanceolate, acute, 

 5-nerved, scabrous or appressed scabrous-pubescent, teeth 4-5 mm. 

 long; awn 18-21 mm. long; palea long ciliate-pectinate on the keels. 



Common in sandy soils along the coast and in interior valleys. 

 Playa del Rey; Fullerton; Capistrano; San Bernardino. 



7. B. unioloides (Willd.) H. B. K. Annual; culms 5-10 dm. 

 high, smooth; sheaths usually pilose-pubescent, sometimes smooth; 

 ligule 3-4 mm. long; leaves linear, scabrous on both sides or sparingly 

 pilose-pubescent; panicle erect or nearly so, 1.5-3.5 dm. long, its 

 lower branches 2-4, short or on larger plants spreading or somewhat 

 drooping; spikelets 2-3.5 cm. long, 5-9 mm. broad, 7-11-flowered; 

 empty glumes broad, subacute, smooth or faintly scabrous, the first 

 usually 5-nerved, 7-10 mm. long, the second 7-nerved, 10-13 mm. 

 long; flowering glumes broadly lanceolate, acute, subcoriaceous, 

 more or less scabrous, slightly 2-toothed at the apex, 13-16 mm. 

 long; awn rarely exceeding 2 mm. in length; palea |-| the length 

 of its glume. 



Occasional along streets and irrigating ditches about Los Angeles; 

 Fruitland. 



8. B. orcuttianus Vasey. Perennial; culms erect, 8-12 dm. high, 

 puberulent near the nodes, leafy below; sheaths glabrous or sparingly 

 pilose-pubescent; ligule 1-2 mm. long; leaves smooth, broadly linear- 

 lanceolate, 1-2 dm. long, 5-7 mm. wide; panicle erect or nearly so, 

 10-15 cm. long, its branches few, widely divaricate in fruit and 

 rather rigid; spikelets 2-2.5 cm. long, 2-3 mm. broad, on short 

 stout pedicels, terete, acuminate, 5-9-flowered; empty glumes 

 smooth or scabrous, the first acute, 6-8 mm. long; the second broader, 

 obtuse, 3-nerved, 8-10 mm. long; flowering glume 10-12 mm. long, 

 obtuse, scabrous to scabrous-pubescent, 5-7-nerved, apex emargi- 

 nate; awn about 5-7 mm. long; palea about equaling its glume. 



Occasional in the San Gabriel and San Bernardino Mountains, 

 in the upper altitudes of the chaparral belt; Santa Catalina. 



