513 
2. ANTHOXANTHUM L. 
Panicle spikelike: spikelets narrow, long-pointed, 3-flowered, the 
two lower florets neutral; outer glumes unequal, herbaceous; glumes 
of neutral florets awned, 2-lobed at the apexes, hairy; floral glume «nd 
palet of perfect floret short, membranaceous: stamens 2: stigmas 2, 
long exserted. 
1. A.odoratum L. (SWEET VERNAL Gkass.) Culms slender, 3 to 6 dm. high: 
leaves flat, hairy: panicle 4 to 8 cm. long: spikelets & to 10 mm. long, the acute 
second glume about twice as Jong as the first; the sterile florets somewhat excced- 
ing the perfect floret.—Introduced from Europe. Very fragrant. 
26. ARISTIDA L. (TRIPLE-AWNED GRASS.) 
Spikelets 1-flowered, spicate or paniculate, pedicellate: empty glumes 
persistent, thin or chartaceous, acute or bristle-pointed, generzlly 
unequal; floral glume coriaceous or indurate, closely folded about the 
small thin palet and stamens and the narrowly terete grain, awnod: 
awn trifid except in Nos. 17 and 18, the divisions divergent: culms 
slender and wiry: leaves narrow, often involute. 
(1. Awns deciduous (tardily deciduous), articulated with the glume: spikelets clustered 
near the ends of the branches. —ARTHRATHERUM. 
1. A. tuberculosa Nutt. Culms 3 to5 dm. high, branched: panicle rigid, some- 
what spreading, 1 to2 dm. long; branches mostly in twos, unequal, 6 cm. long, or 
less: spikelets about 2 mm. long; empty glumes nearly equal, bristle pointed; 
floral glume, including the slender hairy stipe, about 1 cm, Jong: common stoc< of 
the awn twisted, 8 to 10 mm. long; branches nearly equal, 3 to 4 cm. long, o ‘ten 
retlexed.—Prairies, northern Texas and northward. 
2. A. desmantha Trin. & Rupt. Culms4dto8dm., high, much branched: panicle 
1 to 2 din. long, slightly nodding; branches mostly in twos, unequal, 1 dm. long, or 
less: spikelets about 1.5 cm.long; empty glumes bristle-pointed; floral glume al out 
1 em. long, including the stipe: awns divided nearly or quite to the bsse; the 
branches curved and reflexed, 2 to 3 cm. long, equal.—Sandy plains, Texas and 
Indian Territory. 
§2. Awns persistent, not articulated with the glume.—CHATARIA, 
* Panicle narrow and spikelike. 
+ Spikelets less than 1 em, long: awns but little longer. 
++ dwns unequal, the lateral ones very short, erect, the middle one horizontal or turnea 
back, divided to the base. 
3, A. dichotoma Michx. (POVERTY GRAss.) Culms slender, branched, 3 to5 dm. 
high: panicle 5 to 15 cm. long, thin and slender: spikelets about6 mm. long; em pty 
glumes nearly equal; middle awn about 1 cm. long; lateral ones 1 to 2 mm. lon,z.— 
Light sandy land, northern Texas and eastward. 
4. A. simplicifolia Chapm., var. TEXANA Vasey. Differs from the preceding in the 
smaller spikelet, about 4 mm. long and the longer lateral awns 2 to 3 mm. lon.z.— 
Low, sandy land, eastern Texas. 
++ ++ Awns nearly equal. 
= Panicle thin and slender: spikelets 2 to 4 on the short appressed branches. 
