60S CLXI. GRAMINE^. Setaria. 



12. P. DICHOTOMUM. 



St. much branched and dichotomous above, erect or decumbent, 1 — 2f 

 high, branches fasciculate ; Ivs. linear-lanceolate, smooth, very numerous, 1 — 2' 

 long, ciliate at base ; panicles lateral and terminal, simple, capillary, with loose, 

 spreading branches ; spikckts minute, ovoid-obtuse. — Varies with the stem very 

 tall, or low, and decumbent; rather rigid or very slender. N. Eng. to Ky. July. 



13. P. NiTiDUM. Lam. (P. discolor. MuM.) 



St. erect, slender, 8 — 24' high, the nodes with a ring of dense, deflexed 

 hairs; Ivs. lance-linear, narrow, acuminate, rather remote, 2 — 4' by 2 — 4"; 

 sheaths as long as the leaves, hairy at the throat and often all over ; stip. ; pa7i- 

 icle rather small, exserted, roundish-ovoid, ditiuse, nearly glabrous, branches 

 spreading ; spikclcts purplish, numerous, small {^" long), oblong, obtuse ; lower 

 glume minute ; abortive Jl. neutral, its outer palea equaling the upper glume ; $ 

 white, polished. — %1 Woods and fields, U. S. June. 



a. Tall, simple, smooth, except the densely bearded nodes, — Middle and 

 Western States. 



/?. St. with short branches ; Ivs. 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; Ivs. 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 ; spikckts small, numerous, scarcely pu- 

 bescent ; ^ Jloii-er as long as the upper glume ; //-. shining, bluish-white. — % 

 Woods and low grounds, Penn. Darlington. 



15. P. CAPiLLARE. Annual Field Panic. 



St. nearly simple, assurgent and thick at base, 1 — 2f high ; Ivs. hairy, 

 broad-linear, acuminate, 4 — 6' long ; shcaihs 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. • 



(i^ sylvaticum. Torr, St. very slender, branched at the base. — Woods, 



16. P. VERRUCoscM. Muhl. (P. debilis. Ell.) 



St. slender, decumbent and geniculate, branching from the base, 1 — 2f 

 high ; Ivs. linear, a few inches long, spreading, smooth ; panicle much expand- 

 ed, few-flowered, flowers verrucose ; abortive fiower of one palea, and neuter. — 

 (1)1 Swamps and thickets. Mid. and S. States, Panicle terminal and lateral, 

 loose and capillary. Aug. 



17. P. viRGATUM. Salt-lick Panic. 



Glabrous and often purple ; 5^. 3 — 5f high ; Ivs. long, linear-lanceolate, 

 hairy at base ; sheaths striate ; stip. with long, white cilice ; panicle virgate, at 

 length spreading, difl^use, very large ; Jls. acuminate, and with the glumes, 

 divaricate, paleae of the abortive flower nearly equal, enfolding the purple sta- 

 mens. — %. Salt-lick prairies, fields, &c., N. Y. to Ind. 1 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, 

 paleae and fruit as in the genus Fanicum. 



1. S. viRiDis. Palis. Wild Timothy. 



St. smooth, 2 — 3f high ; Ivs. 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 ; palece of the perfect fiower longitudinally striate, punctate, — 

 (1) Common in cultivated grounds, Free States. July, Aug. 



