236 



POACEAE 



29. Bromus arenarius Labill. 



Australian Brome-grass. Fig. 558. 



Bromus uvcnarius Lal)ill. Nov. Holl. PI. 1: 2i. pi. 28. 1804. 



Culms 15-40 cm. tall; sheaths and blades pilose; 

 panicle pyramidal, open, nodding, the spreading 

 branches and slender pedicels sinuously curved; 

 glumes densely pilose, acute, scarious-margined, 

 tile tirst narrower, 3-nerved, 8 mm. long, the sec- 

 ond 7-nerved, 10 mm. long; lemmas densely pilose, 

 7-nerved, 10 mm. long, 2-toothed at apex ; awn 

 straight, 10-16 mm. long. 



Sandy roadsides, gravelly or sterile hills, Oregon to 

 southern California; introduced from Australia. Apr. -June. 

 Type locality, Australian. 



30. Bromus japonicus Thunb. 

 Japanese Bronie-grass. Fig. 559. 



Bromus japonicus Thunb. Fl. Japon. 52. 1784. 



Bromus patulus Mert. & Koch, Deutschl. Fl. 1: 685. 1823. 



Culms erect or geniculate at base, 40-70 cm. 

 tall ; sheaths and blades soft-pubescent ; panicle 

 12-20 cm. long, broadly pyramidal, diffuse, some- 

 what drooping, the lower branches 3-5, slender ; 

 glumes rather broad, the first narrower, acute, 3- 

 nerved, 4-6 mm. long, the second obtuse, 5-nerved. 

 6-8 mm. long; lemmas broad, obtuse, smooth, 9- 

 nerved, the marginal pair faint, 7-9 mm. long, the 

 hyaline margin obtusely angled above the middle, 

 the apex emarginate ; awns 8-10 mm. long, some- 

 what twisted and strongly divaricate at maturity, 

 those of the lower florets shorter than the upper; 

 palea conspicuously shorter than the lemma. 



A weed in waste places, Washington to California and 

 Kansas, occasional in the eastern .States, introduced from 

 Kurope and the Orient. May-July. Type locality: Japan. 



70. LOLIUM L. Sp. PI. 83. 1753. 



Spikelets several-flowered, solitary, sessile, placed edgewise to the continuous rachis, 

 one edge fitting to the alternate concavities, the rachilla disarticulating above the glumes 

 and between the florets; first glume wanting (except on the terminal spikelet), the second 

 outward, strongly 3-5-nerved, equaling or exceeding the second floret ; lemmas rounded on 

 the back, 5-7-nerved, obtuse, acute or awned. Annuals or perennials with flat blades and 

 simple terminal flat spikes. [An ancient Latin name.] 



Species about 8, in Eurasia, 4 of these being introduced in the United States. Type species, LoUum 

 pcrcunc L. 



Glume shorter than the spikelet. 



Lemmas awned. 



Lemmas nearly or quite awnless. 

 Glume as long or longer than the spikelet; annuals. 



Spikelets conspicuous. 



Spikelets inconspicuous, the florets hidden Ijeliind the appressed glumes. 



1. L. multiflorum. 



2. L. pcrcniic. 



3. L. temulentum. 



4. L. subulatum. 



