SoUdago. COMPOSITE. 159 



lines long : bracts of the involucre rather rigid, glabrous, oval to linear-oblong : rays 3 to 6, 

 rather fewer than disk-flowers: akenes minutely pubescent. — Jour. Acad. Philad. vii. 327; 

 Torr. & Gray, Fl. ii. 220. S. rotundi/olia, UC. Prodr. v. 332, & .S. scaberrima, Torr. &, Gray, 

 1. c, broad-leaved form. S. deceinjiora, Gray, PI. Lindli. ii. 223, not DC. — Dry hills and 

 prairies, S. W. Illinois to Arkansas, W. Louisiana, and Texas; first coll. by Berlandier and 

 Nutiall. 



c. Scabro-puberulent, somewhat cinereous, small-leaved: the lateral ribs obsolete. 

 S. sparsiflora, Gray. Fouuded on incomplete specimens (branches), of doubtful aiiinity, 

 scabrous rather tliau puberulent, leafy into the narrow and strict branches of the panicle : 

 leaves all small (the larger hardl}' an inch long), lanceolate-linear, rather acute at both ends, 

 rigid, entire, witii lateral ribs and veins almost obsolete : heads somewhat scattered or few 

 in the short imperfectly racemiform and somewhat sccund clusters, 3 lines long : bracts of 

 the involucre ratlier small, oblong-linear, barely obtuse: rays 6 to 10, little surpassing the 

 disk. — Proc. Am. Acad. xii. .58; Rothr. in Wheeler Rep. vi. 146. — S. Arizona, near Camp 

 Lowell, Rothrock. Llano Estacado, N. W. Texas on the borders of New Mexico, Bigdou\ — 

 To which must be added 



Var. SUbcinerea, Gray. Quite cinereously puberulent, the leaves scabro-puberulent: 

 heads- more crowded and secund in the virgate ])anicles : rays more conspicuous. — Proc. 

 Am. Acad. xvii. 197. — Rucker Valley, S. Arizona, Lpnimoti. Base of stem and lower leaves 

 unknown : the affinity decidedly with S. nemoralis. Also a form between this and 6'. Cana- 

 densis, var. canescciis, with larger heads, &c., coll. New IMexico in the Mogollou Mountains, 

 1881, Rusbi/. 



= = = Leaves fhinnish, puberulent but green, broad, acute, divergently triplinerved and 

 veiny: lyanchcs of the loose panicle racemiform, secund, leaf}': bracts of the involucre nar- 

 rowly obliini;-, obtuse, outer with greenish tips : rays few. 



S. Drummondii, Torr. & Gray. Soft-puberulent : stem 3 feet high, freely branched: 

 leaves ovate or broadly oval, nearly or quite glabrous above; cauline copiously serrate, com- 

 monly acute at both ends, almost ])etioled (lower 3 or 4 inches long and 2 or more broad) ; 

 those of the flowering branches numerous even through the inflorescence, from 2 inches 

 down to a quarter-inch long, obtuse, sparingly denticulate or entire : rays 4 or 5, often 

 3-lobed, rather large. — Fl. ii. 217. S. xdwifoUa, Hook. Comp. Bot. Mag. i. 97. — S. W. Illi- 

 nois and Missouri to Louisiana, flowering late ; fir.st coll. by Drummond. Allied in some 

 respects to S. 7-n[/ns<i and S. amplexicaidis. 



***** Heads in a compact and corymbiform thyrsus or cyme: radital leaves mostly 

 long-petioled and with I'l'oiniueut midrib: akeues except in the firtt species wholly glabrous. — 



CoKYMBOS.E. 



-(— Leaves, even the radical, not triplinerved, flat; cauline sessile, verj- numerous: involucrt; of 

 oblong-linear to oval faiutlj- striate bracts: akenes ver}' glabrous. 



S. rigida, L. Somewhat cinereous with a slunt and dense, either soft or (in age) rather 

 scabrous pubescence : stem stout, 2 to 5 feet higli (rarely more dwarf) • leaves rigid, obscurely 

 serrate or entire ; radical and lowest cauline oval or oblong, rounded at both ends or acute 

 at base, 3 to 7 inches long; upper cauline ovate-oblong, gradually smaller upward, with 

 slightly clasping or decurrent base : clustei-s dense : heads about 5 lines long, campanulate, 

 many- (over 30-) flowered: involucral bracts broad: rays 7 to 10, rather large: akenes 

 turgid, 1 2-1 5-nerved. — Spec. ii. 880; Ait. Kew.iii.21G; Michx. Fl. ii. 118; Ell. Sk. ii. 390; 

 Torr. & Gray, Fl. ii. 208. S. (jrandiflora, Raf. in Med. Rep. hex. 2, v. 3.59, & Desv. Jour. 

 Bot. i. 226. — Dry and gravelly or sandy soil, Canada to the Saskatchewan, south to the upper 

 part of Georgia, southwest to Texas and W. Colorado. Varies with smaller heads, looser 

 inflorescence, and greener more scabrous leaves, in Texas, &c. 



S. COrymbosa, Ell. Stem and leaves (except their margins) quite smooth and glabrous, 

 green: heads (3 to 5 lines long) in looser inflorescence: akenes short, turgid, 10-ncrved: 

 otherwise as in tiie preceding, of which it may be a glabrous variety. — Sk. ii. 378 ; Torr. & 

 Gray, 1. c. ; not of Poir. Snp])l. v. 461, which is a form of S. Virgnurea. — Upper and middle 

 Georgia and Alabama; first coll. by Mr. Jackson : apparently also in Texas. 



S. Ohioensis, Riddell. Glabrous and smooth throughout : stem slender, 2 or 3 feet high: 

 radical and lower cauline leaves lanceolate or elongated-oblong, 5 to 9 inches long, half-inch 

 to an inch or more wide, attenuate at base, almost entire; upper lanceolate, sessile by a 



