g38 COMPOSITAE (composite FAMILY) 



5. C. pub^scens Ell. More leafy, 0.5-1.3 in. 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. Ill, Mo., and southw. June-Sept. 



* * Wings of ache ne 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 southw. 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 mostJy entire, acute; pappus 2-toothed or none; leaves opposite, 

 sessile, mostly 3-divided, appearing as ifwhorled; perennial, 3-9 dm. high. 



H- Leaves S-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 southwest w. July. 



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



8. C. major Walt. Plant minutely soft-pubescent ; leaves each divided into 

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

 (C. senifoUa Michx.) — Sandy woods, Va., and southw. July. 



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

 foUa, var. T. & G.; O. major, var. Oemleri Britton.) — Va., Ky., and southw. 



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

 sessile leaflets which are 2-6-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 1-2-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 peliolate, pinnately 3-^-divided ; perennial. 



11. C. tripteris L. (Tall Coreopsis.) Smooth; stem simple, 1-2.7 m. 

 high, corvmbed at the top; leaflets lanceolate, acute, entire. — Pa. to s. Out., 

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

 when bruised j disk turning brownish. 



55. THELESPtRMA 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 

 pedimculate heads of yellow flowers. (From dv^r}, a nipple, and air4pfxa, 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-pinnaie, the lobes filiform ; outer involucral 

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

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

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



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

 With narrow or filiform divisions or the upper entire ; bracts 4-6. the outer very 



