720 GRAMINEjE CH.BT0CHLOA 



HOMALOCENCBBDS 



I 



large tumid obovate usually hairy spikeleta 1% lines long. Common in 

 open places, Washington to California. 



* • • Spikeleta crowded in 3-4 rows or irregularly on dlpe side of 

 the spike-like branches of the panicle. 



P. Cbcs-galm L. Sp. 56. Stems stout, 1-4 feet high, often branching 

 at hafKH»^h^<'^i>>^-B'''^^-^''*^ glabiMJBS :• leaver 6-^ iames tong, ^-1 inch 

 broad, gfjabrotts, smooth or scabrous : panicle ctKAposed of 5-15 sessile erect 

 or ascending branches, or the lower branches spreading or reflbxed : spike- 

 lets ■ ovate, green or purple, densely crowded, the glumi^s more or less 

 awned. Common In fields and waste places throughout NQrth America : 

 naturalized from Europe. 



4 CH-iETOCHLOA Scribn. U. S. Dept. Agr. Div. Agrog. Bui. 4, 38. 



Mostly annual grasses with erect stems, flat leaves aftd spike- 

 like panicles. Spikelets 1 -flowered or rarely with a second sta- 

 minate one. Rachella with bristles below the articulation. 

 Spikelets with 4 glumes, the 3 outer membranous, the third often 

 subtending a palet and rarely a staminate flower, the fourth 

 chartaceous, subtending a palet of similar texture and p, perfect 

 flower. Stamens 3. Styles distinct, elongated. Stigmas plum- 

 ous. Grain free, enclosed in the glume. 



C> viRiDis Scribn. 1. c. 39. Setaria viridii Beauv. Stems erect or as- 

 cending, 1-3 feet high, simple or branched : sheaths glabroua : leaves 3-10 

 inches long, 2-6 lines wide: spikes 1-4 inches long: spikelets about a line 

 long, elliptical, much shorter than the upwardly barbed bristles. In waste 

 places and cultivated fields, throughout North America : introduced from 

 Europe. 



Tribe 3 Oryzese B^unih Enum. i, 5. Spikelets usually much 

 compressed laterally, 1-flowered, staminate^ pistillate or hermaphro- 

 dite. Empty glumes 2 or none, the flower being subtended by the 

 floral glume and palet alone. Stamens frequently 6. Axis of the 

 inflorescence not articulated. 



5 HOMALOCENCHRUS Mieg.; Hall Hist. Stirp. Helv. ii, 201. 



Panicle loose, its base often enclosed by the upper sheath. 

 Spikelets much flattened, more or less crowded and overlapping 

 each other, awnless,, 1-flowered. Glumes only one, hard, ^trongly 

 flattened laterally, fringed on the keel with bristly hairs, 3'nerved. 

 Stamens 1, 3, or 6. Ovary smooth. Styles short. Stigmas plu- 

 mose with branching hairs. Grain flat, enclosed by the glume. 



H. oryzoideg Poll. Hist. PL Palat. i, 62. Stems 2-3 feet high : leaves 

 flat, spreading, 6-8 lines wide, very rough upward : panicle much Dt-anched, 

 spreading, 6-8 inches long : spikelets. 2>^-3 lines long, pale green : stamens 

 3. In wet places, eastern Oregon to California and the Atlantic St&tes. 



Sdbokder ii POACEiE R. Br. Verm. Schr. i, 115. 



Spikelets one- to many-flpwered, the imperfect or rudimentary 

 flowers if any uppermost. Rachella usudlly articulated ^bove the 

 empty glumes" sp that, these are persistent. In spikefipts with 2 or 

 more flowers the rachella is usually articulated beloW each floW" 

 ering glume. 



