204 DICOTYLEDONOUS PLANTS. 



H. lewis Pcrs. : leaves opposite, ovate, serrate, 3-nerved. Bupkthal- 

 mum hdianihoid.es WiUd. Htllanthus laxis Linn. 



HAB. Banks of streams. N. Y. to Flor. Aug., Sept. If. 

 Stem 3 5 feet high, dichotomously branched above. Flowers 

 solitary, terminal and in divisions of the stem, on long pedun- 

 cles, large, yellow. 



38. RUDBECKIA. Linn. 



Involucre nearly equal ; scales in a double series. Recep- 

 tacle conic, chaffy. Pappus a 4-toothed margin. 



Syngenesia. Frustranea. 



* Involucre imbricate ', chaff of Uie receptacle mucnmate. 



1. R. purpurea Linn. : very rough ; lower leaves broad-ovate, atten- 

 uate at base, remotely toothed ; eauline ones lanceolate-ovate, acumi- 

 nate at each end, nearly entire ; ray florets very long, deflexed, bifid. 



HAB. High grounds. N. Y. to Flor. W. to Miss. July Sept. 

 1(. Stem 34 feet high, sparingly branched, differing some- 

 what in the degree of roughness. Leaves also varying much in 

 length and breadth. Flowers large, terminal ; rays purple ; disk 

 brown. This plant has been found by Mr Edward Dunn, on 

 the banks of the Hudson, about two miles below this city, which 

 I believe" is the most northern station yet discovered. "It differs 

 considerably in its generic character from most of the other spe- 

 cies, and Mr. Elliott, indeed, suggests its separation from them. 



** Involucre nearly equal ; chaff unarmed. 



2. R. fulgida Ait. : stem hispid, the branches long, virgate and 1 - 

 flowered ; leaves oblong-lanceolate, denticulate, hispid, narrowed and 

 slightly cordate at base ; scales of the involucre as long as the ray ; 

 chaff* lanceolate. R. chrysomela Mich. 



HAB. Mountains. Penn. 1.. C:ir. July Oct. If. Stem 2 3 

 feet high, branched. /'//// florets 1214, 2-clefl at the summit, 

 yellow, scarcely longer than the leafy scales of the involucre. 



3. R, hirta Linn. : very hirsute ; stem virgate, sparingly branched. 

 1-flowered ; peduncles naked ; leaves ovate-spathulate, 3-nerved, ser- 

 rate, hairy ; scales of the involucre imbricate, in a triple series, shorter 

 than the ray ; chaff obovate, acute. 



HAB. Mountains. N. S. to Flor. W. to Miss. Aug., Sept. 

 2_. Stem 2 3 feet high, scabrous and hairy. Lcates alternate, 

 sessile or subclasping, very hairy. Flowers solitary, terminal. 

 Ray florets about 14, bifid, hairy, yellow, twice as long as the 

 involucre. 



4. R. triloba Linn. : hairy-hispid ; stem paniculate ; branches divari- 

 cate, many-flowered, leafy ; leaves lanceolate, acuminate at each end. 

 serrate ; the lower ones 3-lobed ; scales of the involucre linear, deflex- 

 ed, as long as the ray. 



HAB. Mountains. N. S. to Car. W. to Miss. Aug., Sept. 



