180 STNGENESIA. FRUSTRANEA, 



toothed; seed very entire, naked. Hab. In open gras&y 

 swamps, from New Jersey to Georgna. — Root perennial: 

 stem about 12 inches high, sn^ooth, simple, or son^what 

 branched. Leaves very smooth, about 2 inches long, op- 

 posite and connate at the base, which is partly ciliated, 

 axills producing leaves or abortive branchlets. Flowers 

 pale red, and rather small, often only 3, more rarely 6 or 

 8; peduncle filiform, about 3 inches long; rays about 8, ob- 

 soletely tridentate, middle denture or lobe large. Exte- 

 rior calix very small, interior 8-leaved; disk partly saffron- 

 yellow. Seeds entire, not emarginated, naked. Flower- 

 ing in August. 



f f Leaves opposite^ divided. 

 6. aristata. A. Bidens? 7. trichosperma, ^. aiireaP X- 

 C. aurea, Aiton. 8. auriciilata. 9. tripteris. 10. senifu- 

 Ua^ /3 • rigida. Leaflets linear-lanceolate, margin scabrous; 

 exterior calix about 12-leaved. Hab. In Georgia. 



11. * palmata. Stem low, simple and compressed, most- 

 ly 1-flovvered; leaves opposite, sessile, and somewhat co- 

 riaceous, palmately 3-lobed, smooth, margin scabrous, 

 segments linear-oblong, obtuse, entire or subdivided; out- 

 er and inner calix 8-parted; seeds oblong-elliptic, naked. 

 IIab. On the open plains of the Michigan Territory, Illi- 

 nois and Lower Louisiana. — Stem perfectly simple, about 

 12 inches high, deeply and regularly striated, 1 to S.flow- 

 ered. Leaves 1 to 2 inches long, cuneate at the base, to- 

 wards the summit divaricately 3-cleft, lower ones subdi- 

 vided, lateral segments ur\pqually bifid, central lobe trifid- 

 Flower yellow, rather large. 



12. trifida. 13- tennifolia. 14. verticillata. 15. mitis. 



ff f Leaves alternate. 



16. acuta. Ph. 17. gladiata. Petals dilated, trifiJ, 

 Stem simple, slender, about 2 feet high; leaves thick. 18. 

 angiistifolia. 



19. * 7iudata. Stem low and simple, summit dichoto- 

 mous; leaves smooth, subulate-linear, very remote, upper 

 ones minute; rays red, obsoletely 3-toothed; seed naked. 

 Hab. Xear Su Mary's in West Florida. — Dr Baldwyn. 

 Stem striated, smooth and round, 2 or 3 feet high, with 

 scarcely more than 2 conspicuous leaves, the lower of 

 which is 4 or 5 inches long, and filiformly narrow, the .p- 

 per about an inch long, the uppermost 3 or 4 lines Flow- 

 ers red, dichotomous, 4 perhaps to 6; peduncles 4 or 5 

 inches long Exterior calix minute. — Allied to C. rosea, 

 but remarkable tor the paucity ot leaves. 2U. aspera. Ph. 



An American genus of about 30 species extending into 



