STNGENESIA FRUSTRANEA. 



429^ 



than the seed, which they almost envelope. Seed compressed, obovate, 

 with two persistent rather unequal awns. 



I insert tliis species with some hesitation. Its seed and receptacle are 

 those of an Actinomeris, while its involucrum and habit approach nearly tQ 

 the Helianthus. It belongs perhaps to an intermediate genus. 



Grows in dry sessile spoils in the western districts of Georgia. 



Flowers September — October. 



With the arrangement of the species in this genus I am not satisfied, but 

 it may serve to facilitate examination. The division into opposite and alter- 

 nate leaved species is, I suspect, not to be strictly relied upon. I have still 

 some specimens which I have not described. The western districts of Geor- 

 gia, and more particularly the state of Alabama, abound witli plants of this 



an 



dens in our country retards the progress, and impedes even the accuracy of 

 investigation, for specimens frequently present not only inadequate but even 

 erroneous impressions of the real structure and habit of aj)lant. 



BIDENS. Gen. Pl. 1267. 



Lwolucrum duplex, | Involucrum double, 

 exterius inaequale. Co- \ the exterior unequal. 

 rollulm radii plerum- Florets of the ray fre 



que 0. 



gona, aristis 2 



Semina tetra- quently wanting. Seed 



1 sea 



bris instruct a. Recejy- 

 taculum paleaceum, 



planum. 



I 



4-angled, 

 with 2 — 4 



furnished 

 scabrous 



awns. Receptacle chaf- 

 fy, flat. 



1. Chrysanthemoides. Mich. 



B. floribus radiatis, 

 cernuis; radiis involu- 



cro subaequali 



longioribus 



triplo 



Flowers radiate, nod 



I 



ding; florets of the ray 

 thrice as long as 



the 



? 



ngis, utrinque atten 

 uatis, dentatis, basi 

 connati*?. Pursh. 



fohis ob- nearly equal involu- 



crum; leaves oblong, 

 tapering at each end, 

 toothed, connate at 

 base. 



