+ 



^ 



SYNGENESIA NECES8ARIA. 461 



I 



1. Laciniatum. 



S. caule superne liis- I Stem hispid towards 

 pido; foliis radicalibus I the summit; leaves of 

 caulinisquepinnatifidis, the root and stem pin- 

 laciniis dentato sinua- natifid, the segments 

 tis; floribus paniciila- toothed and sinuate; 

 tis; mvolucri foliohs flowers in panicles; 

 subcordatis acumina- I scales of the involu- 



crum somewhat cor- 

 date, acuminate. 



tis. 



18 



Sp. pi. 3. p. 2330. Mich. 2. p. 145. Pursli, 2. p. 577. Nutt. 2. p. 



3 



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 oije wide, amplexicaule at base, pinnatifid, segments 

 distant, toothed and sinuate, scabrous. Scales of the involucrura ten, ter- 

 minating in a subulate point. Florets of the ray about thirty, as long as 

 the involucrura, yellow as in all the species of this genus. Florets oi 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. 



I 



ovate acuminate^ the outer ones fringed or hispid along the margins. Flo- 

 Tets of the ray sixteen to twenty, perhaps twenty-four; of the disk numerous, 

 Seed compressed; dilated, slightly winged, crowned with two subulate, verv 

 acute teeth. 



Grows in the prairies of the Alabama. 



Flowers from June to August. 



1 have introduced this remarkable species in a notCj because I know not 

 ?^ether it has ever been found whhin the limits assigned to this work, 

 ine prairies of the Alabama in which this plant is found, commence within 



^ lew miles of the western frontier of Georgia, and this appears to be almost 

 exclusively a prairie plant. 



