SYNGENESIA NECESSARIA. 
IV. NECESSJRIA. 
Qsg. CHAPTALIA. Fent. hort. cels 6l. 
1. C. foliis ovato-oblongis integerrimis subtas argenteo-to- 
mentosis, scapo nudo unidoro, flore nutante. — Fent. 
1. c. cum icone. 
Tussilago integrifolia. Mich. fl.amer.'l.p. 121. 
Perdicium semifiosculare. Walt.fi. car. 204. 
In sandy fields and woods, in moist soil ; Carolina to 
Florida. 1/ , May, June. v. v. Flowers white, with 
a tinge of pale purple. 
660. SILPHIUM. Gen. pi 1334. 
l.S. caule superne hispido, foliis radicalibus caulinisque 
pinnatifidis, laciniis dentato-sinuatis, calycinis foliolis 
subcordatis acuminatis. — WilLd. sp. pL 3. p. 2330. 
Icon. Linn. Jil fas c. 1. t. 3. 
On the banks of rivers in the western territories, parti- 
cularly on the Mississippi. 1/. Aug. — Oct. v, v. 
Frona eight to twelve feet high ; flowers large, and, as 
all the rest of the genus, yellow. 
2. S. caule lasvi, foliis caulinis sinuato-pinnatifidis, radica- 
libus ternatis sin lafo- mukifidis, fioribus parvis pani- 
culatis.— sp. pi 3. p 2331. 
S. laciniatum. Walt. fi. car. 2\y. 
S. sinuatum. Herb. Banks, mss. 
In gravelly woods, near the sea-coast : Virginia and Ca- 
rolina. 11. Aug. — Oct. V. V. Not above two feet 
high j flowers small. 
3. S. caule laevi, foliis radicalibus amplis cordatis, caulinis 
alternis ovatis serratis scabris. — W illd. sp. pi. 3. 
p. 233 I . 
Icon. Jacq. hort. 1. t. 43. 
In the western mountains and Louisiana. 11 . Aug. — 
Oct. V. V, About five feet high j radical leaves very 
large. 
4. S. caule tetragono laevi, foliis oppositis connatis ovatis 
serratis. — Willd. sp. pL 3, p. 2331. 
&. S. squamis calycinis quatuor exterioribus calyce interiore 
longiore. Willd. enum. g33. 
In the Allegany mountains : Pensylvania to Carolina. 
tomentosa* 
laciniatum. 
compositum. 
terelinthina- 
ceum. 
perfoliatum. 
conjunctum. 
