430 
SYNGrENESIA PRUSTRANEA, 
Sp. pi. S. p. 1717. Mich. 2. p. 136. Pursh, 2. p. 566. Nutt. 2. p, 
1 79. 
Coreopsis Bidens, Walt. p. 215. 
I have transcribed the specific character with only a verbal alteration 
from Pursh, because the plant I shall describe differs from it in several parti- 
culars and leads to a suspicion I have long entertained, that several species 
are now covered under this name. 
Root annual? Stem erect and declining, about two feet high, smooth 
below, a little hairy towards the summit, with opposite branches and pedun- 
cles. Leaves opposite, sessile, somewhat connate, oblong lanceolate, ser- 
rate, glabrous. Peduncles sometimes opposite, sometimes from the division 
of the stem, three to six inches long, generally erect, one-flowered. Involu - 
crum double, the exterior about eight-leaved, the leaves unequal, foliaceous, 
lanceolate, the largest as long as the florets of the ray, the interior eight- 
leaved, the leaves equal, lanceolate, membranaceous, about as long as the 
florets of the disk. Florets of the ray eight, lanceolate, bright yellow, bear- 
ing only the rudiments of a germ; of the disk numerous, small, tubular, yel- 
lowish. Seeds compressed, oblong, the pappus composed of two awns 
which together with the edges of the seed are retrorsely aculeate, and some- 
times may be discovered one or two smaller awns on the flattened angles. 
Receptacle convex, chaffy; chaff concave, membranaceous, as long as the 
florets of the disk. 
Grows in shallow pools, very abundant, enlivening and almost covering 
ponds and old rice fields at the close of autumn with its brilliant-flowers. 
Flowers October — November. 
2. CONNATA. 
B. floribus discoide- 
is; involucro exteriore 
flore triplo longiore; 
foliis caulinis ternatis. 
foliolis later alib us con- 
natis, floralibus obion- 
go-lanceolatis. 
Flowers discoid, ex- 
terior involucrum thrice 
as long as the flower; 
stem leaves ternate, 
lateral leaves connate, 
floral leaves oblong- 
lanceolate. 
Sp. pi. 3. p. l^l 8. Pursh, 2. p. 566. Nutt. 2. p. 179. 
Root perennial. Stem about two feet high, glabrous, branches opposite, 
Leaves opposite, lanceolate, dentate, glabrous, very much attenuated at 
base, paler or slightly glaucous (I describe from specimens) underneath, the 
lower ternate, the upper simple, all somewhat connate at base. Peduncles 
opposite, one-flowered. Involucrum double, the exterior foliaceous, much 
longer than the disk, the interior membranaceous, resembling the chaff of 
the receptacle. Florets of the ray 0: of the disk numerous, yellowish. Seed 
compressed; awns of the pappus subulate, retrorsely aculeate. Chaff of the 
receptacle nearly as long as the florets of the disk. 
