SYNGENESIA FRUSTRANEA. 429 
than the seed, which they almost envelope. Seed compressed, obovate, 
with two persistent rather unequal awns. 
I insert this species with some hesitation. Its seed and receptacle are 
those of an Actinomeris, while its involucrum and habit approach nearly to 
the Helianthus. It belongs perhaps, to an intermediate genus. 
Grows in dry sessile soils 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 with plants of this 
genus, and many remain yet to be distinguished. But the want of Botanic Gar- 
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 a plant. 
BIDENS. Gen. Pe. 1267. 
Involucrum duplex, 
exterius inaequale. Co- 
rollulce radii plerum- 
que 0. Semina tetra- 
gona, aristis 2 — 4 sca- 
bris instructa. Recep- 
iaculum paleaceum, 
planum. 
1. Chrysanthemoides. 
B. floribus radiatis, 
cernuis; radiis involu- 
cro subaequali triplo 
longioribus; foliis ob- 
longis, utrinque atten- 
uates, dentatis, basi 
connatis. Pursh. 
Involucrum double, 
the exterior unequal. 
Florets of the ray fre- 
quently wanting. Seed 
4-angled, furnished 
with 2 — 4 scabrous 
awns. Receptacle chaf- 
fy, flat. 
Mich. 
Flowers radiate, nod- 
ding; florets of the ray 
thrice as long as the 
nearly equal involu- 
crum; leaves oblong, 
tapering at each end, 
toothed, connate at 
base. 
