UKDEK 70. COMPOSITE. 179 



none Leaves mostly opposite. Rays usually yellow ; disk-flowers yellow 

 or dark purple. 



J^f Corollas of the disk dark purple. . .(a) 



a Ray-flowers yellow with a purple base. Achenia incurved Nos. 1 a 



a Ray-flower? wholly yellow. Achenia not incurved, 2-awned. Summer Nos. 4 6 



Corollas of the disk yellow. Rays rose-colored. Leaves simple Nos. 7, 8 



Corollas of the disk and ray all yellow (disk brownish in No. 9). . .(6) 



b Leaves sessile, divided often so as to appear verticillatc Nos. 9 19 



b Leaves petiolate, never serrate, c pinnate with lance-linear segments. .Nos. 13, K 



c simple, or rarely atiricled below Nos. 15, 16 



ft Leaves petiolate, serrated, d simple. Achenia awns obsolete Nos. 17, 18 



d compound. e Rays about 8 Nos. 19 ?1 



e Rays wanting Nos. 22, 23 



1 C. DRUMMONDII. (T) Pubescent ; Ivs. pinnately (l-5)-divided ; segm. oval or oblong, 



entire ; sc. lance-acuminate ; rays unequally 5-toothed. Tex. l-2f. Rays ample, showy. 

 ft. atrotang-uinea. A garden variety, with the rays wholly dark purple. July-Oct 



2 C. TINCTOKIA. (T) Glabrous ; Ivs. alternate, some pinnate ; lobes lin. -oblong and linear ; 



scales very short, acute ; rays 3-lobed at apex. Nebraska. l-3f. Beautiful. Summer 



3 C. ATKINSONIANA. 2f Lf. lobes linear-spatulate to linear; PC. oblong, obtuse ; rays 3- 



lobed ; fr. distinctly winged. Columbia River. Oreg. lids, handsome, like C. tinctoria. 



4 C. gladlata Walt. St. terete ; Ivs. alternate, thick, some ternately divided, lance- 



oblong to lance-linear ; outer scales lance-ovate ; fr. fringed, awns 2, slender ; rays 3 

 toothed at the dilated apex. Moist barrens, S. 2 3f. Heads several, corymbed. 



5 C. angnstifolla Ait. St. square ; Ivs. opposite (mostly), undivided, spatulate to lin- 



ear, obtuse ; outer sc. ovate, obtuse : fr. wing-fringed, awns 2. short ; rays 3-lobed. S. 



C. JEmlerl Ell. St. angular above ; Ivs. opp., lance-ovate to lanceolate ; outer scales 



oblong, obtuse ; fruit margined, ciliate, the 2 awns very short. Ga. (Elliott) and Fla. 



7 C. iiudiita Nntt. Very slender; Ivs. few, terete, rush-like, alternate, the lower very 



long ; hds. few ; rays wedge-obovate, crenate-lobed at apex. 11 Swamps, Ga. Fla. 2f. 



8 C. rosea N. Branching ; Ivs. opp., 1-veined, linear ; ped. short ; outer sc. very short ; 



rays oblong, obscurely tridentate. U Wet grounds, Ms. to Ga. 8-16'. Delicate. Jl. Aug. 



9 C. soiiilolla MX. Minutely downy or glabrous ; Ivs. opposite, ternate, sessile, ap- 



pearing in whorls of 6; Ifts. ovate-lanceolate, varying to linear-lanceolate or even to 



linear ; scales downy, obtuse ; rays entire, it Dry, Va. Ky. to Ga. 1 2f. July, Aug. 

 IOC. delplilnifolla Lam. Lvs. opp., sessile, divided into Ifts. which are each again 



2-5-parted ; seg. linear, entire, acute ; disk-fls. brown at the tips. V, Va. to Fla. 2f. Aug. 

 11C. v < rt i<-il lata L. Branched ; Ivs. 3-divided, closely sessile, the divisions 1-2-pin 



nately-parted ; seg. filiform-lin. ; rays 1-3-toothed. li Moist, Md. to Ga. l-3f. Jn.-Aug. 



12 C. pal milt a N. St. angled, striate, leafy to top ; Ivs. sessile, deeply 3-cleft, rigid 

 lobes linear, acutish, entire or again cleft; fr. linear-elliptic. 2f Prairies, W. 1-2. July. 



13 C. tripterls L. St. simp'" '.all, corymbons ; Ivs. opp., stalked, thick, 3-5-divided: 

 seg. liu. -lanceolate, entire, acute; hds. small ; rays obtuse, n Dry, W. andS. 4-8f. Jl. 



14 C. grandlflora N. St. low ; hds. solitary, large, on long naked stalks ; Ivs. lance- 

 olate, mostly divided into lance-lin. seg.; rays 4-5-cleft. V Mo. to Tex. Much like No.15. 



1 5 C. Iniiccolata L. Ascending ; lower Ivs. oblanceolate, upper lanceolate, all entire ; 



holds solitary, on long naked peduncles; rays 4-6-toothed. if Damp soils, West and 

 So.th. Head shi wy. Rays about 8, spreading 2' or more. June Aug. t 



16 C. auricula ta L. Lower Ivs. round-ovate, petiolate, some of them with 2 (ma!) 

 lateral segm. (auriculate) at base, the upper oblong, subsessile ; hds. few, on long ped., 

 outer scales oblong-linear. Dry soils. 111. to Va., and S. 1 3f. May Aug. 



17 C. latlfolla MX. Very glabrous, tall; Ivs. thin, opp., ovate to oblong, acuminate, 

 unequally toothed ; hds. small, rays 5 or 6, entire, large ; sc. lin., spreading. Mts. S. Aug. 



18 C. arguta Ph. Stem strict ; Ivs. simple, ovate to lanceolate, petiolate, acuminate, 

 sharply serrate ; scales oblong ; rays 9 12, 3-toothed ; awns obsolete. Hills, S. 2 6f 



