OBDER 70. COMPOSITE. 179 



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

 or dark purple. 



Corollas of the disk dark purple., .(a) 



a Ray-flowers yellow with a purple base. Achenia incurved Nos. 1 3 



a Ray-flowers 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).. .(ft) 



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



t> Leaves petiolate, never serrate, c pinnate with lance-linear segments. .Nos. 13, 14 



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



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



d compound. e Rays about 8 Nos. 19 n 



e Rays wanting Nos. 22, 23 



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



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

 /3. atrosang-vinea, A garden variety, with the rays wholly dark purple. July-Get. 



2 C. TINCTORIA. (D 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. if Lf. lobes linear-spatulate to linear; PC. oblong 1 , obtuse ; rays 3- 



lobed ; fr. distinctly winged. Columbia River, Oreg. Hds. handsome, like C. thictoria. 



4 C glad.ia.ta 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. aiigustifolia 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. 



6 C. JEmleri 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. mid ata Nutt. Very slender; Ivs. few, terete, rush-like, alternate, the lower very 



long ; hds. few ; rays wedge-obovate, crenate-lobed at apex. ii 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. seiiifolia 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. 2; Dry, Va. Ky. to Ga. 1 2f. July, Aug. 



IOC. delpliiiiii'olia Lam. Lvs. opp., sessile, divided into Ifts. which are each again 



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



1 1 C. verticillata L. Branched ; Ivs. 3-divided, closely sessile, the divisions 1-2-pin 

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



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

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



1 3 C. tr iptcrls L. St. simple, tall, corymbous ; Ivs. opp., stalked, thick, 3-5-divided : 

 seg. lin. -lanceolate, entire, acute; hds. small ; rays obtuse, if. Dry, W. andS* 4-8f. Jl. 



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

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



15 C. laiiceolata L. Ascending; lower Ivs. oblanceolate, upper lanceolate, all entire; 

 hends solitary, on long naked peduncles ; rays 4-5-toothed. li Damp soils, West and 

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



1 8 C. auricula ta L. Lower Ivs. round-ovate, petiolate, some of them with 2 nall 

 latcial segm. (auricnlate) at base, tiie upper oblong, subsessile ; hds. few, on long ped., 

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



17 C. latifoJia 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. argiita Ph. Stem strict; Ivs. simple, ovate to lanceolate, petiolate, acuminate, 

 nlmrply serrate ; scales oblong ; rays 912, 3-toothcd ; awns obsolete. Hill?, S. 2 5 



