graminejE. (grass family.) 615 
54. SETARIA, Beauv. Bristly Foxtail-Grass. 
Spikelets altogether as in Panicum proper, and awnless, but 
with the short peduncles produced beyond them into solitary or 
clustered bristles resembling awns (not forming a real involucre). 
Inflorescence a dense spiked panicle, or apparently a cylindrical 
spike. — Annuals, in cultivated grounds, with linear or lanceolate 
flat leaves. (Name from seta , a bristle.) 
* Bristles single or in pairs, roughened or barbed downwards . 
3. S. verticillata, Beauv. Spike cylindrical (2'-3' long, 
green), somewhat interrupted, composed of apparently whorled short 
clusters; bristles short. (Panicum, L.) — Naturalized near dwellings. 
* * Bristles in clusters, roughened or barbed upwards. 
2. s. glaiica, Beauv. (Bottle-Grass.) Spike cylindrical, 
very dense {tawny yellow, 2' -4' long); bristles 6-11 in a cluster , 
much longer than the spikelets; perfect flower transversely wrinkled. 
— Very common in stubble, &c. 
3. S. viridis, Beauv. (Green Foxtail.) Spike nearly cylin¬ 
drical, more or less compound {green) ; bristles few in a cluster , longer 
than the spikelets; perfect flower striate lengthwise and dotted. — Com¬ 
mon in cultivated grounds. 
4. S. Italica, Kunth. Spike compound , interrupted at the base, 
thick, nodding (6' -9' long, yellowish or purplish ) ; bristles 2-3 in a 
cluster , either much longer or shorter than the spikelets. — S. Ger- 
mdnica, Beauv., is a variety. Sometimes cultivated under the name 
of Millet, or Bengal Grass ; sparingly naturalized. 
5 5. CENCIIRUS, L. Hedgehog or Burr Grass. 
Spikelets as in Panicum, awnless, but inclosed 1 to 5 together 
in a globular bristly or spiny involucre, which becomes coriaceous 
forming a deciduous burr in fruit: the involucres sessile in a ter¬ 
minal spike. Styles united below. (An ancient Greek name of 
Setaria Italica, transferred, for no evident reason, to this genus.) 
1. C. tribllloides, L. Culms branched at the base, ascend- 
ing (1°-2P long); leaves flat; spike oblong, composed of 8-10 spher¬ 
ical heads; involucre prickly all over with spreading downwardly 
barbed short spines, more or less downy, inclosing 2 or 3 spikelets. 
(J) — Sandy soil, along the coast; the spikes whitish near salt water. 
56. TRIPSACUM, L. Gama-Grass. Sesame-Grass. 
Spikelets monoecious, in jointed spikes, which are staminate 
above and fertile below. Staminate spikelets 2, sessile at each 
