GRAMINACEAE 



55 



Panicum — Panic l ii 



(I.;it. panicum, millet, from panls, bn 



1. Plants glabrous throughout, 8 20 dm. high, erect 



2. Plants bristly pnbescenl ;ii least on the sheaths, more or less ascending 



or spreading, .> 10 dm. high 

 ;i. Ann nil, panicle ample, branches long and sli 

 1>. Perennial, panicle short, less than 10 cm. 



P. virgdlum 



P. capillare 



P. scribneridnum 



PHALARIDEAE— CANARY GRASS TRIBE 

 A single genus I in late season) ilaris 



Phalaris — Canary Grass 



(Gr. name of this grass, from phaios, Bblnli 



1. Panjcle very dense, spike-like; glumes winged on keel 



2. Panicle branched; glomes not (ringed on the keel 



a. Leaves green 



b. Leaves striped with while 



ORYZEAE — RICE TRIBE 



1. Cultivated grass; glumes present, small 



2. Native grasses; spikelets monoecious, or perfect and staminate; glumes 



lacking 



a. Tall aquatic grass, pistillate spikelets at the summit of the panicle 



b. Low marsh grass with closely crowded spikelets, the perfect more or 



less inclosed in the sheaths 



/'. inariinsis 



P. arwidindcea 

 P. arwidindcea 



var. pitta 



Oryza 



Zizdnia 

 Leersia 



\ single cultivated species 



Oryza — Rice 



(Gr. oryza, rice) 



O. s I 



Zizdnia — Wild Rice, Indian Rice 



(Gr. zizanion, ;i \v ly grass) 



1. Stems 2 i m. high; panicle open 



J S( -ms about 1 m. high ; panicle more oppressed 



Z. palustris 

 Z. aqudtica 



Leersia — Cut-grass, White Grass 



i Named for the German botanist, i 



1. Panicle simple, branches stiffly spreading; spikelets 2 3 mm. long 



2. Panicle twice branched ; spikelets 4-5 mm. long 



/. . -tirginica 

 L. oryzoides 



CHLORIDEAE — GRAMA TRIBE. 



1. Tall marsh gruss with long, sharp-edged leaves 



2. Prairie grass with short blunt-edged leaves 



Spartina 

 Dou- 



Spartina — Slough Grass 



(Gr. spartine, cord, referring to the le 



A single species 



Bouteloua — Grama Gr.: 



(Named for Boutelou, a Spanish botanist) 



1. Spikes 15 or more, pendant 



2. Spikes 1-4 usually curved, horizontal or ascending 



a. Leaves smooth 



b. Leaves hairy 



5. tynosuroides 



B. curtipendula 



B. oligostdchya 

 B. hirsula 



