GRAMINACEAE 



57 



A vena — ( )ats 



I l.at. avena, oats) 

 1.- Lemma with a ring of hairs at the base, awn 3 cm. long 

 2. Lemma without a ring of hairs, awn less than 3 cm. or lacking 



A. fdtua 

 A. sativa 



FESTUCEAE — BLUEGRASS TRIBE 



1. Tall reed-like swamp grass, spikelets with long silky hairs Phragmites 



2. Lower meadow or woodland grasses 



a. Spikelets 8-12 mm. wide, about as long as broad Brisa 



b. Spikelets less than 8 mm. wide, longer than broad 



(1) Panicle dense and spike-like, shining Koeleria 



(2) Panicle open, not shining 



(a) Spikelets in one-sided, capitate clusters Dactylis 



(b) Spikelets not collected into one-sided clusters, spikelets usually 



large 

 x. Lemmas more than 6 mm. long, 2-toothed at apex, often awned 



near the apex Bromus 



y. Spikelets smaller ; lemmas less than 6 mm. long, awnless or 

 awned at the apex 

 (x) Spikelets 3-S-flowered 

 m. Glumes compressed and keeled ; lemma mostly with webby 



hairs at the base, awnless Poa 



n. Glumes rounded, at least at the base ; lemma without hairs, 



mostly awned at the apex Festuca 



(y) Spikelets 5-30-flowered, much flattened Eragrostis 



Phragmites — Reed-grass 



(Gr. phragmites, growing in hedges; of doubtful application) 

 A single swamp species, 4-8 feet tall P. communis 



A single cultivated species 

 A single species 



Briza — Quaking Grass 



(Gr. brizo, a kind of grain) 



Koeleria — Koeleria 



(Named for Koeler, a German writer on grasses) 



Dactylis — Orchard Grass 



(Gr. daktylos, finger, of doubtful application) 



A single introduced species 



Bromus 

 (Gr. bromos, a kind of oats) 



1. Spikelets densely silky-hairy all over 



2. Spikelets not densely silky-hairy all over 



a. Lemma awned, awn over 1 cm. long 



b. Lemma awnless or with an awn less than 1 cm. long 



(1) Lemma awnless or merely awn-pointed 



(2) Lemma with a short straight awn 



Poa — Bluegrass 



(Gr. poa, grass) 



1. Low, spreading annual, less than 2 dm. high 



2. Perennials; stem erect, over 3 dm. high 



a. Stems not tufted, from extensively creeping rootstocks 



B. maxima 



K. cristdta 



D. glomerdta 



B. Kdlmii 



B. tectorum 



B. inermis 

 B. cilidtus 



P. annua 



P. compressa: Canada 

 bluegrass 



b. Stems tufted 



(1) Panicle crowded; stems much exceeding the leaves in length 



(2) Panicle open and spreading; stems scarcely exceeding the leaves P. nemordlis: meadoiu 



grass 



P. pratcnsis: bluegrass 



