SYNGENESIA NECESSARIA. 
461 
1. Laciniatum. 
Stem hispid towards 
the summit; leaves of 
the root and stem pin- 
natifid, the segments 
toothed and sinuate; 
flowers in panicles; 
scales of the involu- 
crum somewhat cor- 
date, acuminate. 
Sp. pi. 3. p. 2330. Mich. 2. p. 145. Pursh, 2. p. 577- Nutt. 2. p. 
183. 
Root perennial. Stem eight to twelve feet high, simple, smooth near the 
base, towards the summit rough and hispid. Leaves alternate, petiolate, 
about two feet long and one wide, amplexicaule at base, pinnatifid, segments 
distant, toothed and sinuate, scabrous. Scales of the involucrum ten, ter- 
minating in a subulate point. Florets of the ray about thirty, as long as 
the involucrum, yellow as in all the species of this genus. Florets of the 
disk numerous. Seeds emarginate, with two small awns. 
This plant belongs to the Mississippi and a few of its tributary streams. 
It has been reported to me as growing in the western districts of Georgia 
and among the Alleghany mountains. No plant, however, that I have seen 
belongs properly to the species as described by Linnaeus, unless the follow- 
ing should be considered as one of its varieties. 
Flowers August to October. Pursh. More probably from June to Au- 
gust. 
ovate acuminate, the outer ones fringed or hispid along the margins. Flo- 
rets of the ray sixteen to twenty, perhaps twenty-four; of the disk numerous. 
Seed compressed, dilated, slightly winged, crowned with two subulate, very 
acute teeth. 
Grows in the prairies of the Alabama. 
Flowers from June to August. 
I have introduced this remarkable species in a note, because I know not 
whether it has ever been found within the limits assigned to this work. 
The prairies of the Alabama in which this plant is found, commence within 
a few miles of the western frontier of Georgia, and this appears to be almost 
exclusively a prairie plant. 
S. caule superne 1ns- 
pido; foliis radicaLibus 
caulinisque pinnatifidis, 
laciniis dentato sinua- 
tis; floribus panicula- 
tis; involucri foliolis 
subcordatis acumina- 
tis. 
