468 
GENUS 41. DANTHONIA. DeCandole. 
[Named in lionor of M. Danthoine, a French botanist.] 
Spikelets two to ten-flowered, the upper flowers often imperfect; glumes 
membranaceous, longer than the imbricated flowers; lower palea oblong or 
ovate, rounded-cylindraceous, seven to nine-nerved, bearing between the sharp- 
pointed teeth of the tip an awn, (composed of the 3 middle nerves), which is 
flattish and spirally twisted at the base; upper palea bicarinate. 
108. Danthonia Spicata. JBeauvois. 
Syn.—A vena spicata, Linn. 
Culms tufted, erect; leaves,short, somewhat involute awl-shaped; sheaths 
bearded at the throat; panicle simple, receme-like, rather one-sided; the few 
spikelets appressed, seven-flowered; lower palea broadly ovate, loosely hairy on 
the back, much longer than the lance-awl-shaped teeth, about half the length 
of the awn. Perennial; flowers in July. Culms 1 to 2 feet high. Dry places 
Wisconsin, Illinois, Ohio, and about Lake Superior. 
Plate IX.—Fig. 1. a plant of the natural size. 
2. spikelet. 
3. lower palea. 
4. upper palea. 
5. germ and stigmas. 
6. the awn. 
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GENUS 42. AYENA. Linnaeus, 
•YiUt 10 
\Avena, the ancient Latin name of Oats.] 
Spikelets three to many-flowered, panicled, commonly large; the flower 
herbaceo-chartaceous, or becoming harder, of firmer texture than the large and 
mostly unequal glumes, the uppermost imperfect; lower palea rounded on the 
back or keeled, seven to eleven-nerved, bearing a long, usually twisted awn on 
the back, or below the two-cleft tip, proceeding from the mid-nerve only; sta¬ 
mens 3; grain oblong-linear grooved on one side, usually hairy, free, but gen¬ 
erally inverted by the upper palea. 
109. A vena Striata, i Michaux. 
> 
Syn.—T risetum purpurascens, Torr. 
Culms tufted, slender; leaves narrow; panicle simple, loose, somewhat one¬ 
sided, drooping with age; spikelets three to five-flowered, somewhat terete, on 
