SETARiA. TRIANDRIA. DIGYNIA. 153 



0. purpurascens : sheaths hairy ; gUimcs and bristles of the 

 involucrum hairy. Elliott SL 1. p, 113. sub Panicum. 

 Panicum No. 4. (anoiiymos.) M u h I. Gram. \). 10\. Set. 

 purpurascens H umb. ^ B o np. et R o e m, <li>' S c hul t. 

 JI. p. 49J. 

 Hab. In Pennsylvania. Mu hie nb erg. 



'" 3. S. verticillata P. de B. : spike subverticillate ; bristles 

 of the involucrum 2, retrorsely scabrous ; spikelets sohtary ; 

 corolla of the perfect floret nearly snDoolh. R o e m. ^ 

 Schult. II. p. 488. Panicum verticillatum L. W ill d. 

 Spec. I. p. 334, M u h I. Gram. p. 402. Pursh Fl. I. p. 

 66. Big. Bost. p. 18. 



Hoot annual. Culm a foot and a half high, and with the sheaths. 

 smooth. S/iifce (or rather spiked panicle,) about two inches 

 long, erect; rachis triquetrous, hispid. 5/2 j^e/e?s clustered on 

 short divided branches. Bristles of the involucrum generally 

 purple, about twice the length of the flowers. Calyx smooth ; 

 inferior glume ovate, obtuse. Abortive floret neuter ; superior 

 valve distinct, entire. 

 Hab. In sandy cultivated grounds ; rare. Introduced. Near 

 Boston. Bigelow. Litchfield, Connecticut. Brace. In 

 Pennsylvania. Muhlenberg. July. 



4. S. italica P. de B.: spike compound, interrupted at 

 the base, nodding ; spikelets conglomerate ; involucrum many 

 times longer than the flovsrers ; rachis tomentose. R o e m. ^ 

 Schult. II. p. 493. Panicum italicum L, Willd. Spec, 

 I. p. 336. Muhl.Gram.}^.\03. E I Hot t Sk. \. p. 113. 

 Walt. Car. p. 72. 



Boot annual, (perennial. E 1 1.) Culm about 4 feet high, erect> 

 somewhat compressed. Leaves 1 — 2 feet long, about an inch 

 broad, scabrous above. Sheaths a little scabrous, hairy at the 

 throat. Panicle 6 — 8 inches long, with the fasciculi of flowers 

 at the base a little remote. Involucrum of 2 bristles 4 — 6 times 

 longer than the flowers. Glumes unequal, the inferior ovate, 

 very acute ; superior 5-nerved. Abortive floret 1-valved, as 

 long as the calyx. Perfect floret ovate, obtuse, smooth. 

 Hab. Along ditches near Hoboken, New-Jersey. July— Au- 

 gust. 



52. DIGTTARIA. Halltr. 



Spikes linear, unilateral, generally digitate or fascicu- 

 late. Spikelets in pairs on short bifid pedicels. Calt/x 

 1 — 2-valved, 2-flowered; inferior glume often inconspi- 

 cuous, hiferior Jioret abortive, 1-valved, herbaceous. 

 Superior Jioret perfect; valves coriaceous. P, de 

 Beaiiv. Agrost. p. 50. t. X. f. 12. Pers. Syn. I. 

 20 



