56 



GRAMINACEAE 



AGROSTIDEAE REDTOP TRIBE 



1. Spikelets in a cylindrical spike 



a. Lemma without an awn ; glumes awn-pointed or aristate Phleum 



b. Lemma awned ; glumes not aristate Alopccurus 



2. Spikelets in a panicle or spike-like panicle 



a. Spikelets in a dense spike-like panicle Muhlcnbergia 



b. Spikelets in an open panicle 



(1) Lemma firm and hard at maturity, closely enveloping the grain Ory-opsis 



(2) Lemma thin or membranous at maturity, glumes coarse, grain loose 

 x. Lemma with a tuft of straight hairs at its base 



(x) Rachilla prolonged behind the palet, bristle-like Calamagrostis 



(y) Rachilla not prolonged behind the palet Calamovilfa 



y. Lemma without a tuft of hairs at its base 



(x) Glumes longer than, and inclosing, the lemma Agrostis 



(y) Glumes shorter than, and not inclosing, the lemma 

 m. Stems wiry or rigid ; lemma and palet not raised on a short 



pedicel Sporobolus 



n. Stems not wiry ; lemma and palet raised on a short pedicel Cinna 



A single cultivated speci 



A single species 



Phleum — Timothy 



(Gr. phleos, a kind of reed) 



Alopecurus — Foxtail Grass 



(Gr. alopex, fox, cura, tail, referring to the spike) 



P. pratense 



Muhlenbergia — Muhlenbergia 



(Named for Muhlenberg, an American botanist of the 18th 



1. Glumes equalling the lemma 



2. Glumes much longer than the lemma 



A. geniculdtus. 



century) 

 M. mexicdna 



M. racemosa 



Orvzopsis — Mountain Rice 



(Gr. oryza, rice, opsis, likeness; of little meaning) 

 A single species (at this season) 



A single species 

 A single species 



Calamagrostis — Blue j oint Grass 



(Gr. kalamos, reed, agrostis, grass) 



Calamovilfa — Reed Grass 



(A hybrid name of doubtful meaning) 



Agrostis — Red Top 



(Gr. agros, field, from its home) 



1. Palet at least one-half as long as the lemma, 2-nerved 



2. Palet minute and nerveless or wanting 



O. melanocdrpa 



C. canadensis 



C. longifolia 



A. dlba 



A. hi emails 



Sp< n'obolus — Rush-grass, Drop-seed 



(Gr. spora, seed, bolos, throwing) 



1. Slender plants, the spike-like panicle exserted beyond the upper leaf 



sheath 



2. Coarse wiry plant, the much branched panicle more or less inclosed by 



the upper leaf sheath 



Cinna — Wood Reed-grass 



M'.i. kinna, a kind of grass) 



A single species 



.S". cuspiddtus 

 S. cryptdndrus 



C . arundindceat 



AVENEAE — OAT TRIBE 



A single genus 



