202 DICOTYLEDONOUS PLANTS. 



HAB. Gravelly soil. Penn. to Car. W. to Miss. Aug., Sept. 

 2_f. Stem 34 feet high, somewhat branched. Lmcer leaves 

 very large. Flowers in a loose terminal panicle. Rays yellow; 

 disk dark purple. 



2. H. angustifolius Linn. : stem slender, slightly scabrous ; leaves 

 narrow-lanceolate, entire, glaucous beneath, with the margin revolute, 

 the upper ones alternate ; scales' of the involucre linear-lanceolate, 

 ciliate, spreading ; chaff 3- toothed. Rudbeckia angvstifolia 71V////. 



HAB. Cedar swamps. N. J. to Flor. Sept. Nov. If. Stem 

 2 3 feet high, sparingly branched. Leaves opposite below, 

 alternate above, scabrous on the upper surface. Flmocrs small, 

 terminal. Rays about 12, yellow ; disk dark purple at the sum- 

 mit. I have, adopted the specific description of Mr. Elliott. 



** Florets qf the disk yellowish. 

 t Leaves opposite. 



3. //. dirnrirutus Linn. . stem smooth, branched ; leaves ovate-lan- 

 ceolate, 3-nerved scabrous above, smooth beneath ; panicle trichoto- 

 mous ; flowers small. . 



HAB. Woods. Can. to Car. Aug. Oct. 21. Stem 56 feet 

 high, di- and tri-chotomously divided. Leaves on long petioles, 

 rounded at base, and tapering to a long almost acuminate point ; 

 upper ones often alternate. Floicers small, in terminal panicles. 



4. H. tracheltfolius IFiUd. : leaves ovate-lanceolate, acuminate, ser- 

 rate, 3-nerved, very scabrous on both sides ; scales of the involucre 

 linear-lanceolate, ciliate, outer ones larger. H. gigas Mich. 



HAB. Woods. Can. to Car. Aug. Oct. If. Stem 34 feet 

 high, branching towards the summit, very scabrous. Leaves at- 

 tenuated at base into a short petiole. Floicers in a loose termi- 

 nal panicle. Rays 10 12. This species is united by Sprengel 

 with H. decapctalus. 



5. H.frondosus llilld.: stem smooth below ; leaves ovate, acutely 

 serrate, peduncles scabrous ; involucre squarrose, undulate, leafy, cili- 

 ate ; rays 8-flowered. 



HAB. Woods. Can. and N. S. Aug., Sept. U-Stcm 4 feet 

 high. Ftoirtrs small. Resembles H. decapetalus and mvltiflorus 

 in several respects, but is distinct. Pursh. 



G. H. mollis ll r ittd. : stem smooth below, scabrous near the summit ; 

 leaves ovate-lanceolate, acute, serrate, scabrous above, pubescent and 

 hoary beneath ; flowers-few, terminal. 



HAB. Low grounds. Penn. to .Car. July Sept. If. Stem 

 3 C feet high, purple, smooth except near the top. Flowers 

 few, in a terminal panicle. Rays about 10. This is the H. mol~ 

 Us of Elliott, which, although it agrees in most points with 

 Pursh' s description, is not according to the former author H. to- 

 mentosus of Michaux. 



tt Upper leaves alternate. 

 7. H. giganteus Linn. : leaves alternate, lanceolate, serrate, scabrous, 



