838 COMPOSITAE (COMPOSITE FAMILY) 



5. C. pubSscens Ell. More leafy, 0.5-1.3 m. high, pubescent or nearly 

 glabrous ; leaves thickish, oblong or the lower oval-obovate and the upper 

 oblong-lanceolate, entire or with 2-4 small lateral lobes ; heads usually smaller. 

 Woods, Va. to s. 111., Mo., and south w. June-Sept. 



* * Wings of achene narrow, callous-thickened, involute. 



6. C. auriculata L. Pubescent or glabrous ; stems 5-13 dm. high, branch- 

 ing, sometimes with runners ; leaves mostly petioled, the upper oblong or oval- 

 lanceolate, entire; the lower oval or roundish, some of them variously 3-5-lobed 

 or -divided; outer bracts oblong-linear or lanceolate. Rich woods and banks, 

 Va. to 111., and south w. June-Sept. 



3. Style-tips cuspidate ; achenes oblong, nearly straight, without callus, the 

 wing narrow or none; rays yellow, mostly entire or slightly toothed. 



* Outer bracts narrow, about the length of the inner, all more or less united at 



base ; rays mostly entire, acute ; pappus 2-toothed or none ; leaves opposite, 

 sessile, mostly ^-divided, appearing as if whorled ; perennial, 3-9 dm. high. 



*- Leaves 3-cleft, but not to the base. 



7. C. palmata Nutt. Nearly smooth, simple ; leaves broadly wedge-shaped, 

 rigid ; the lobes broadly linear, entire, or the middle one 3-lobed. Prairies, 

 Mich, to Man., and southwestw. July. 



- - Leaves divided to the base, uppermost and lowest sometimes simple. 



8. C. m^jor Walt. Plant minutely soft-pubescent ; leaves each divided into 

 3 sessile ovate-lanceolate entire leaflets, therefore appearing like 6 in a whorl. 

 (C. senifolia Michx.) Sandy woods, Va., and south w. July. 



Var. stellata (Nutt.) Robinson. Glabrous; the leaves narrower. (<7. seni- 

 folia, var. T. & G.; C. major, var. Oemleri Britton.) Va., Ky., and southw. 



9. C. delphinif61ia Lam. Glabrous or nearly so; leaves divided into 3 

 sessile leaflets which are 2-b-parted, their divisions lance-linear, 2-6 mm. broad, 

 rather rigid ; disk brownish. Pine woods, Va., and southw. July. 



10. C. verticillata L. Glabrous ; leaves divided into 3 sessile leaflets which 

 are \-2-pinnately parted into narrowly linear or filiform divisions. Dry ridges 

 and open woods, Md. to S. C. and Ark.; reported from w. Ont. and n. Mich.; 

 cultivated in old gardens, but not showy ; occasionally escaping. July-Sept. 



* * Outer bracts narrow, shorter, all united at base ; rays entire, obtuse ; pappus 



none ; leaves petiolate, pinnately 3-5-divided ; perennial. 



11. C. trfpteris L. (TALL COREOPSIS.) Smooth; stem simple, 1-2.7 m. 

 high, corymbed at the top; leaflets lanceolate, acute, entire. Pa. to s. Ont., 

 Wise., e. Kan., and southw. Aug., Sept. Heads exhaling the odor of anise 

 when bruised ; disk turning brownish. 



55. THELESPERMA Less. 



Heads many -flowered ; rays about 8 and neutral, or none. Involucre as in 

 Coreopsis, the inner bracts scarious-margined. Receptacle flat, the scarious 

 chaff falling with the wingless and beakless achenes ; pappus of 2 stout subulate 

 retrorsely hispid awns. Smooth herbs, with opposite dissected leaves and 

 pedunculate heads of yellow flowers. (From dtjX-f), a nipple, and ffTrtp/j.a, seed, 

 on account of the papillose achenes.) 



1. T. trifidum (Poir.) Britton. Annual or biennial, 3-7 dm. high, loosely 

 branching and very leafy ; leaves 2-pinnate, the lobes filiform ; outer involucral 

 bracts 8, subulate-linear, hardly equaling the inner which are united only below 

 the middle ; rays 1 cm. or more long ; outer achenes conspicuously roughened on 

 the back. Barrens and plains, Mo. to Neb., westw. and MrathweetW. May-Aug. 



2. T. gracile (Torr.) Gray. Perennial, rather rigid, naked above ; leaves 

 with narrow or filiform divisions or the upper entire ; bracts 4-6, the outer very 



