ITS STNGENESIA. PRUSTRANEA. 



sile and scabrous, equally green on both sides; flowera 

 fastigiate, numerous; calix squarrose, segments lineal^ 

 ra\s lin(;ar, very numerous. Hab. In Upper Louisiana, 

 on the banks of rivers; probably to the sources of the 

 Missouri Disk yellovV; flowers often nearly double. 11. 

 altissimiis 12. str^mnosus. 13. proslraUis 14. decapcta- 

 lus. 15. multijlorus. 16. mollis. 17. mocrajjhyllus. Scarce- 

 ly distinct from H. decapttalus. 18 angustifolhis- 



A genus of about 30 species exclusively indigenous to 

 Nortli and South America, with the exception of // coch- 

 inchinensis and H indicus of India and Egypt, scarcely dis- 

 tinct from H. alliums. 



590. RUDBECKIA. L. 



Calix suboqual, mostly consisting of a double 

 series of leaflets. Receptacle paleaceous, tonic. 

 Fappus a 4-toolhed margin. 



Herbaceous; leaves alternatCj^entire, lobed orpinnaufid* 

 flowers terminal; disk often dark, rays yellow, rarely 

 brown, in Ji. piiA^purea purple. — Stigma often obtuse. 



Species. 1. R. purpurea. Obs. Stem nearly smooth. 

 Root perpendicular. Rays imperfectly styliferous. Scales 

 of the receptacle acuminated; calix imbricated, squarrose. 

 p. * serotina. Stem hispid; root iiorizontal; flowers later; 

 rays bidentate. Flowers purple. Hab. Oji the plains of 

 Lower Louisiana. 2. amplexifolia. 



3. lavigata? Ph. Obs- Leaves subcoriaceous, very 

 smooth and lucid; radical spathulate-ovate, obtuse, those 

 of the stem not acuminated; peduncles few, long, and na- 

 ked; flowers fastigiate; disk oblong. Hab. In the Pine 

 forests of Georgia. 4. discolor. Ph. 5. spathulata. Leaves 

 very smooth and entire, spathulate-ovate, and amplexi- 

 caule; stem smooth, 1 or few-flowered; rays of the corolla 

 3-toothed. Hab. In the mountains of Carolina, v. s. In 

 Herb. Muhl. 



6. gracilis. Herb. Banks, mss. Slender and pubescent;^ 

 stem 1 to 3-flowered, peduncles very long; leaves spathu- 

 late-ovate, remotely denticulate. Hab. In Pine forests 

 from Virginia to Florida. Calix spreading; disk conic, 

 brown. 7. aristata. 8. fulg-ida. 9. hirta. 10. aspera. 

 Persoon, R. radida? Vw.. 11. triloba. Obs- Scales of the 

 receptacle awned. /3. subtomentosa, Mich. 



12. columna)iB- Hispid; stem nearly simple, 1 or few- 

 flowered, peduncles very long; radical leaves nearly en- 

 tire, cauline pinnatifid, segments linear-lanceolate; calix 

 simple, 5 to 8-leaved, rays 5 to 8j disk cylindric, elon. 



