606 CLXI. GRAMINEZ. - SETARIA. 
12. P. DICHOTOMUM. 
St. much branched and dichotomous above, erect or decumbent, 1—2f 
high, branches fasciculate; /vs. linear-lanceolate, smooth, very numerous, 1—2’ 
long, ciliate at base ; panicles lateral and terminal, simple, capillary, with loose, 
spreading branches ; spikelets minute, ovoid-obtuse.—V aries with the stem very 
tall, or low, and decumbent; rather rigid or very slender. N. Eng. to Ky. July. 
13. P. nrripum. Lam. (P. discolor. Muhl.) 
St. erect, slender, 8—24' high, the nodes with a ring of dense, deflexed 
hairs; lvs. lance-linear, narrow, acuminate, rather remote, 2—4’ hy 24”; 
sheaths as long as the leaves, hairy at the throat and often all over; stip. 0; pan- 
icle rather small, exserted, roundish-ovoid, diffuse, nearly glabrous, branches 
spreading; spikelets purplish, numerous, small (3 long), oblong, obtuse ; lower 
glume minute ; abortive fl. neutral, its outer palea equaling the upper glume; © 
white, polished.—2| ? Woods and fields, U.S. June. 
a. Tall, simple, smooth, except the densely bearded nodes.—Middle and 
Western States. 
8. St. with short branches; lws. and sheaths pubescent.—N. Eng. and Middle 
States, common. 
y. Low, branched, very hairy, purplish—Dry fields, N. Eng., common.— 
These are the extreme forms, between which there are many intermediate ones. 
14. P. microcarpon. Muhl. Darl. 
St. 18—30’ high, erect, simple, glabrous; joints glabrous; lvs. lanceolate, 
veined, ciliate at base, undulate and scabrous on the margin, scabrous above, 
smooth beneath, 6—10” wide; sheaths deeply striate, smooth; stip. 0; panicle 
large, much branched, nearly smooth; spikelets small, numerous, scarcely pu- 
bescent; § flower as long as the upper glume; fr. shining, bluish-white—2, 
Woods and low grounds, Penn. Darlington. 
15. P. CAPILLARE. Annual Field Panic. 
St. nearly simple, assurgent and thick at base, 1—2f high; lws. hairy, 
broad-linear, acuminate, 4—6! long; sheaths covered with hispid hairs; panicle 
large, pyramidal, capillary, loose, expanding; spikelets small, purple, lanceo- 
late, acuminate, smooth, on long, hispid peduncles; abortive fl. of 1 palea-—@ 
Fields and roadsides, U.S. Aug. 
&. sylvaticum. Torr. St. very slender, branched at the base—Woods. 
16. P. verrucosum. Muhl. (P. debilis. Eu.) 
St. slender, decumbent and geniculate, branching from the base, 1—2f 
high; Jvs. linear, a few inches long, spreading, smooth; panicle much expand- 
ed, few-flowered, flowers verrucose ; abortive flower of one palea, and neuter.— 
@*? Swamps and thickets, Mid. and 8. States. Panicle terminal and lateral, 
loose and capillary. Aug. 
17. P. vircatum. Salt-lick Panic. 
Glabrous and often purple; st. 3—5f high; Js. long, linear-lanceolate, 
hairy at base; sheaths striate; stip. with long, white cilie; panicle virgate, at 
length spreading, diffuse, very large; fis. acuminate, and with the glumes, 
divaricate, palee of the abortive flower nearly equal, enfolding the purple sta- 
mens.—2| Salt-lick prairies, fields, &c., N. Y. to Ind.!| Aug.—None of these 
species are of much value in agriculture. 
22. SETARIA. Palis. 
Lat. seta, a bristle ; from the bristly involucres of the spikelets. 
Inflorescence a compound, cylindrical spike; spikelets 2-flowered, 
invested with an involucre of 2 or more bristles; glumes, flowers, 
palez and fruit as in the genus Panicum. 
1. 8. viripis. Palis. Wild Timothy. 
St. smooth, 2—3f high; vs. lanceolate, flat, minutely serrulate; sheaths 
striate, hairy on the margin, and with a setose stipule; spike cylindric, com- 
pound, terminal, green; involucre of 4—10 fasciculate bristles, much longer 
than the spikelets; palee of the perfect flower longitudinally striate, punctate.— 
@ Common in cultivated grounds, Free States. July, Aug. 
