368 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



the keel. O — Ballast near Port- 

 land, Oreg.; coast of Europe and 

 North Africa. 



Phleum subulatum (Savi) Aschers. 

 and Graebn. Annual; culms 10 to 20 

 cm. tall; blades 2 to 5 cm. long; 

 panicle linear-oblong, mostly 3 to 8 

 cm. long, 4 to 5 mm. thick; glumes 

 2 mm. long, scaberulous, subacute, 

 the tips approaching. — Ballast, 

 Philadelphia, Pa., and near Portland, 

 Oreg. ; Mediterranean region. 



Phleum paniculatumHuds. Annual; 

 culms 10 to 30 cm. tall; foliage sca- 

 brous; panicle cylindric, 2 to 5 cm. 

 long, 3 to 6 mm. thick; glumes 2 mm. 

 long, glabrous, hard, widened up- 

 ward to a truncate swollen summit, 

 with a hard awn-point at the tip. 

 O — Ballast near Portland, Oreg.; 

 Mediterranean region. 



80. GASTRlDIUM Beauv. 



Spikelets 1-flowered, the rachilla 

 disarticulating above the glumes, pro- 

 longed behind the palea as a minute 

 bristle ; glumes narrow, unequal, some- 

 what swollen at the base; lemma 

 much shorter than the glumes, hya- 

 line, broad, truncate, awned or awn- 

 less; palea about as long as the 

 lemma. Annual with flat blades and 

 pale, shining, spikelike panicles. Type 

 species, Milium lendigerum L. (G. 

 ventricosum). Name from Greek gas- 

 tridion, a small pouch, alluding to the 

 slightly saccate glumes. 



1. Gastridium ventricosum (Gouan) 

 Schinz and Thell. Nitgrass. (Fig. 

 518.) Culms 20 to 40 cm. tall; foliage 

 scant, blades scabrous; panicle 5 to 

 8 cm. long, dense, spikelike; spikelets 

 slender, about 5 mm. long; glumes 

 tapering into a long point, the second 

 about one-fourth shorter than the 

 first; floret minute, plump, pubescent, 

 the delicate awn 5 mm. long, some- 

 what geniculate. O — Open ground 

 and waste places, Oregon to Cali- 

 fornia; Texas; also Boston, Mass.; 

 introduced from Europe. A common 

 weed on the Pacific coast, of no 

 economic value. 



Figure 518. — Gastridium ventricosum. Plant, X H; 

 glumes and floret, X 10. (Davy and Blasdale 5340, 

 Calif.) 



