180 SYNGENESIA. FRUSTRAXEA. 



toothed; seed very entire, naked. Hab. In open grassy 

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

 stem about 12 inches high, smooth, simple, or somewhat 

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

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

 axllis 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. 



ft Leaves opposite, divided. 

 6. aristata. A Bidens? 7. trichospenna, ^. mireaP X-' 

 C. aurea, Aiton. 8. miriadata. 9. tripteris 10. seuifo- 

 lia, (i * rigida. Leaflets linear-lanceolate, margin scabrous; 

 exterior cahx about 12-leaved. Hab In Georgia. 



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

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

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

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

 er and inner calix 8-})arted; seeds oblong-eihptic, naked. 

 I?AB On the open plains of the Michigan Territory, Illi- 

 nois and Lower Louisiana. — Stem perfectly simple, aL>out 

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

 ered. l^eaves 1 to 2 inches long, cuneate at the base, to- 

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

 vided, lateral segments imequally bifid, central lobe tritid. 

 Flower yellow, rather large. 



12. trijida. 13- teJudfoUa. 14. verticiUata. 15. mitis. 



f f -j- Leaves alternate. 



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

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

 migiistifoUa. 



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

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

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

 Hab. Near St. 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 ot* 

 which is 4 or 5 inches long, and filifor.mly narrow, the up- 

 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. roseup 

 but remarkable for the paucity of leaves. 20. aspera. Ph- 



An American genus of aboitt 30 species extending into 



