SYNGENESIA NECESSARIA. 
5;; 
IV. NECESSJRIA. 
659 . CHAPTALIA. Vent. hort. cels 6l. 
1. C. foliis ovato-oblongis integerrimis subtus argenteo-to- 
mentosis, scapo nudo unifloro, flore nutante. — Vent. 
1. c. cum icone. 
Tussilago integrifolia. Mich fi. amer. 2 . p. 121 . 
Perdicium semiflosculare. Walt.ji. car. 204. 
In sand , fields and woods, in moist soil : Carolina to 
Florida. If. May, June. v. v. Flowers white, with 
a tinge of pale purple. 
660. SILPHIUM. Gen. pi 1334. 
I.S. caule superne hispido, foliis radicalibus caulinisque 
pinnatifidis, laciniis dentato-siiiuatis, calycinis foliolis 
subcordatis acuminatis — Villd. sp, pl. 3. p. 2330. 
Icon. Linn.JiL fasc. l. t. 3. 
On the banks of rivers in the western territories, parti- 
cularly on the Mississippi. 7/. Aug. — Oct. v. v. 
From eight to twelve feet high ; dow'ers large, and, as 
all the rest of the genus, yellow. 
2 . S. caule laevi, foliis caulinis sinuato-pinnatifidis, radica- 
libus ternatis sinuato- multifidis, floribus parvis pani- 
culatis. — IViUd^ sp. pl 3. p. 2331. 
S. laciniatum. Walt. fl. car. 'l\f . 
S. sinuafum. Herb. Banks, ?nss. 
In gravelly woods, near the sea-coast : Virginia and Ca- 
rolina. 1/. Aug.— Oct. V. V. Not above two feet 
high ) flowers small. 
3. S. caule laevi, foliis radicalibus amplis cordatis, caulinis 
alternis ovatis serratis scabris. — -Willd, sp. pl 3. 
p. 233 1 . 
Icon. Jacq. hort. 1 . t. 43. 
In the western mountains and Louisiana. 1/ . Aug.— 
Oct. V. V. About five feet high 3 radical leaves very 
large. 
4. S. caule tetragono laevi, foliis oppositis connatis ovatis 
serratis. — Wilid. sp. pl. 3. p. 2331. 
(5. S. squamis calycinis quatuor exterioribus calyce interiore 
longiore. Willd. enum. Q33. 
|in the Allegany mountains : Pensylvania to Carolina. 
tomentosa» 
laciniatum. 
compositum. 
terebinthina- 
ceum. 
perfoliatum, 
conjunctum. 
