180 
SYNGENESIA, FRUSTRANEA. 
toothed; seed very entire, naked. Has. 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, 
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. 
-—) £7} Leaves apposite, divided. — 
6. aristata. A Bidens! 7. trichosperma, B- aurea? X. 
C. aurea, Aiton. 8. auriculata. 9. tripteris.- 10. senifo- 
dia, 8 * rigida. Leaflets linear-lanceolate, margin scabrous; 
exierior calix about 12-leaved. Has, In Georgia. 
11, * palmata. Stem low, simple and compressed, most- 
ly I-flowered; 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 S-parted; seeds oblong-elliptic, naked. 
lan. On the open plains of the Michigan Territory, Hli- 
nois and Lower Louisiana —Stem perfectly simple, about 
12 inches high, deeply and regularly striated, 1 to 3-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 unequally bifid, central lobe trifid. 
Flower yellow, rather large. 
12. trifda.. 13. tenuifolia. 14. verticillata. 15. mitis. 
ttt Leaves alternates, 
