GRAMINEAE 21 



flattened, usually oiliate on the keels, awnless, about equal in length, 

 the second much narrower than the first. Leaves clothed with minute 

 hooked prickles. 



Spikelets partly curved, IJ" long. 1. H. Virginicus. 



Spikelets flat, 2"-3" long. 2. JEC. oryzoides. 



1. H. Virginicus (Willd.) Britton. Culms l°-3° high with a finally 

 long exserted panicle : spikelets crowded at the ends of the branches, 

 closely appressed and somewhat curved around the branches : stamens one 

 or two. — Rather common in low wet woods. August-October. 



2. H. oryzoides (L. ) Poll. Larger than the last with a larger diffusely 

 branched panicle : stamens three. — Growing in dense masses around 

 swamps and less luxuriantly along streams. Well distributed through- 

 out. August-October. 



13. PHALARIS L. 



Flowers in panicles which are often very spike-like. Spikelets one- 

 flowered with five glumes, the first and second large, keeled and thick, 

 the third and fourth rudimentary (reduced to scales or bristles), the fifth 

 subtending a similar palet and the flbwer. 



Panicle not spike-like ; grass of wet grounds. 1. P. arundinacea. 

 Panicle spike-like; grasses of waste places. 



Spikelets green, narrowly keeled. 2. P. Caroliniana. 



Spikelets white with green lines, broadly keeled. 3. P. Canariensis. 



1. P. arundinacea L. Rkkd Canary Grass. Perennial, 2°-5° 

 high, with long flat leaves ; first and second glumes not winged. — Well ■ 

 distributed in wet grounds in the northeastern part. May-June. 



2. P. Caroliniana Walt. Southern Canary Grass. Smooth annual 

 about 2° high, with spike-like panicle I'-S' long and about 6" wide, 

 oblong in outline. — Rarely adventized along railroads from Sheffield to 

 Courtney. May-June. 



3. P. Canariensis L. Canary Grass. Annual 2°-3° high, with 

 long-peduncled spike-like panicles f '-1J' long, f>"-l" wide at base and 

 tapering to the summit. — Rarely occurs in waste places and along rail- 

 roads. May-June. 



14. ANTHOXANTHUM L. 



Glumes five, the first shorter than the second, the third and fourth 

 empty, two-lobed and awned, the fifth shorter, about the length of the 

 palet. 



1. A. odoratum L. Vernal Grass. Annual about 2° high, with 

 numerous slightly hairy, flat leaves : spikes long-exserted, 2'-3'' long : 

 third glume bearing an awn inserted on the back about the middle, and 

 the fourth an awn inserted near the base. — Rarely adventized along the 

 railroads at Courtney. May-June. 



