SYNGENESIA NECESSARIA. Silphium. 579 
In og - America, Retz, Y. v, s. in Herb. Lam- 
ert. 
12. S. caule tereti levi, foliis subquaterno-verticillatis lan- — atropurpu« 
ceolatis scabris subintegerrimis subsessilibus basi cilia- yeum. 
. tis, superioribus sparsis, panicula dichotoma.— Willd. 
sp. pl. 3. p. 2334. 
In Carolina and Georgia. Lyon. X. Aug. Sept. v.v. 
Resembles the preceding ; but its purple smooth stem 
distinguishes it at first siglit., 
13. S. caule petiolisque tomentosis, ramis nifios; foliis tomentosum. 
alternis cordatis ovatis serratis petiolatis villosis, semi- : 
nibus muticis. — Herb. Banks. mss. 
: Bartram. M. w.s. in Herb. Banks. 
14. S. foliis alternis petiolatis cordatis sinnatis, squamis saly- elatum. 
cinis obtusis.. Herd. „Banks. mss. ; : 
In Carolina. 24. w.s. in Herb. Banks. 
14. S. foliis alternis ovato-lanceolatis cordatis serratis obtusi- reticulatum, 
-~ ‘msculis villosiuseulis. Herb. Banks. mss. 
In Florida. Y. w.s.in Herb, Banks. 
661. POLYMNIA. Gen. pl. 1335. 
_ ALP. viscido-villosa ; foliis denticulatis acuminatis, inferio- canadensis, 
-ribus pinnatifidis, superioribus tellebia ere 
Willd. sp. pl: 3.5.2335... 
con. Ameen. acad. 8.4.1.5, 5 
Ee shady mountains: Canada to Virginia. AX. ios 
> -July. v.v, Two or three feet high; flowers yellow ; 
_ the whole plant has a strong balsamic scent. _ 
2. P. foliis oppositis trilobis acutis in petiolum deeurrenti-  Uvedaliai 
oer: lobis anguloso-sinuatis, radiis ror — Willd. 
sp. pl. 3. p. 2335. . 
P vet atn Cav. ic. 3. t. 227. 
Avon. Pluk. alm, t. 83. f. 3. Moris. hist. 3. s. 6. t. 7. 
af, DB. , Trew pict, suppl. 112. 
‘In the mountains of Virginia and Carolina. 2. July — 
- Set v. v. From tour to eight feet high, 
662, -CHRYSOGONUM, Gen. pl. 1937. 
UMSO pomilum, lanato-villosurn ; foliis in petiolum angus- virginianum: 
; tatis ovalibus dentatis.— Willd. sp. pl. 3. p. 2337. 
| Toon. Pluk. alm. 1 $9. f. 4. E f. 342.43. ©.) 
. On dry hills: Virginia'and Carolina. 2%. May, n. 
v.v. Not above a span high ; flowers yellow. 
