276 COMPOSITE. (COMPOSITE FAMILY.) 



49. RTJDBECKIA, L. CONE-FLOWER. 



Heads many-flowered, radiate; the rays neutral. Scales of the involucre 

 leaf-like, in about 2 rows, spreading. Receptacle conical or columnar; the 

 short chaff concave, not rigid. Achenes 4-augular (in our species), smooth, 

 not margined, flat at the top, with no pappus, or a minute crown-like border. 

 Chiefly perennial herbs, with alternate leaves, and showy terminal heads ; 

 the rays generally long, yellow, often darker at base. (Named in honor of 

 the Professors Rudbeck, father and son, predecessors of Linnaeus at Upsal.) 



* Disk columnar in fruit, dull greenish-yellow ; leaves divided and cut. 



1. R. lacilliata, 1. Stem smooth, branching (2 -7 high) ; leaves smooth 

 or roughish, the lowest pinnate, with 5-7 cut or 3-lobed leaflets; upper leaves 

 irregularly 3 - 5-parted, the lobes ovate-lanceolate, pointed, or the uppermost 

 undivided ; heads long-peduucled ; disk at first globular or hemispherical ; 

 chaff truncate, downy at the tip; rays oblanceolate (1 -2' long), drooping. 

 Low thickets ; common. July - Sept. Var. HtiMins, Gray, low and glabrous, 

 some of the radical leaves undivided or with roundish divisions; heads smaller 

 ($' high) and ray shorter. Mountains of Va. and southward. 



* * Disk hemispherical to oblong-ovoid in fruit, dark purple or brown. 

 t- Lower leaves 3-lobed or parted. 



2. R. triloba, L. Hairy, biennial, much branched (2-5 high), the 

 branches slender and spreading; upper leaves ovate-lanceolate, sparingly 

 toothed, the lower 3-lobed, tapering at the base, coarsely-serrate (those from 

 the root pinnately parted or undivided) ; rays 8, oval or oblong ; chaff of the 

 black-purple depressed-globular disk smooth, awned. Dry soil, Penn. to 

 Mich., Mo., and southward. Aug. Heads small, but numerous and showy. 



3. R. subtomentosa, Pursh. Stem branching above (3-4 high), 

 downy, as well as the petiolate ovate or ovate-lanceolate serrate leaves beneath ; 

 heads short-peduncled ; disk globular, dull brown ; receptacle sweet-scented ; 

 chaff downy at the blunt apex. Prairies, Wise., 111., Mo., and southward. 



-t- -t- Leaves undivided, rarehj laciniately toothed. 



4. R. hirta, L. Biennial, very rough and bristly -hairy throughout ; stems 

 simple or branched near the base, stout (1-2 high), naked above, bearing 

 single large heads; leaves nearly entire; the upper oblong or lanceolate, sessile; 

 the lower spatulate, triple-nerved, petioled ; rays (about 14) more or less ex- 

 ceeding the involucre; chaff of the dull brown disk hain/ at the tip, acutish. 

 Dry soil, western N. Y. to Wise., and southward. Now common as a weed 

 in eastern meadows, introduced with clover-seed from the West. June- 

 Aug. 



5. R. fulgida, Ait. Hairy, the branches naked at the summit and bear- 

 ing single heads ; leaves spatulate-oblong or lanceolate, part!;/ clasping, triple- 

 nerved, the upper entire, most I // obtuse ; rays about 12, equalling or exceeding 

 the ample involucre; chaff of the dark purple disk nearly smooth and blunt. 

 Dry soil, N. J. aud Peun. to Ky., Mo., and southward. Variable, 1 -3 high ; 

 the rays orange-yellow. 



6. R. spathulata, Michx. Pubescence short and appressed ; slender, 

 8' -3 high; leaves obovate or spatulate or the upper ovate to lanceolate, 



