322 
SYtfGENESIA SUPERFLUA. 
Stem about three feet high, pubescent. Leaves nearly sessile, generally 
ovate-lanceolate, acutely denticulate, finely pubescent. Flowers in small 
axillary and terminal leafy corymbs. Involucrum many leaved, imbricate, 
leaves very pubescent, almost tomentose, rather longer than the florets. 
Florets in this species very similar in arrangement and structure to the 
preceding; female florets very slender, the hermaphrodite comparatively 
large, with a short pappus. 
Grows along the margins of rivers and swamps in South-Carolina and 
Georgia. Pursh. I have not observed this species in the low country of 
Carolina, it grows probably in the middle or upper country. My specimens 
are from Pennsylvania. 
Flowers August — September. 
3. Bifrons. 
C. herbacea, sub 
glutinosa; foliis ovali- 
lanceolatis, serratis, 
cordatis, amplexicauli- 
bus; corymbis conferti- 
floris. 
Herbaceous, some- 
what glutinous; leaves 
oval-lanceolate, ser- 
rate, cordate, amplexi- 
caule; corymbs densely- 
flowered. 
Sp. pi. 3. p. 1920. Pursh, 2. p. 524. Nutt. 2. p. 145. 
Conyza Amplexicaulis. Mich. 2. p. 126. 
Baccharis Viscosa. Walt. p. 202. 
Root perennial. Stem erect, two to three feet high, branching towards 
the summit, very pubescent, slightly viscid. Leaves alternate, oblong, acute, 
amplexicaule, like the stem very pubescent, viscid, and sprinkled with glan- 
dular dots, sometimes ferruginous underneath. Flowers in compact, fas- 
tigiate corymbs. Female florets in the circumference of each capitulum, 
hermaphrodite florets few in the centre, all purple. Involucrum imbricate, 
leaflets subulate, somewhat villous externally, sprinkled with glands. Flo- 
rets exactly similar to those of the preceding species. 
This plant exhibits frequently a remarkable phenomenon. In every clear 
frosty morning, during the winter, crystalline fibres nearly an inch in length, 
shoot out in every direction from the base of the stem. It would appear as 
if the remnant of the sap or water, absorbed by the decayed stem, had con- 
gealed, and had burst in this manner through the pores of the bark. Does 
this proceed from any essential quality of the plant, or from its structure ? 
Grows in wet soils, ditches and around ponds. 
Flowers July — September.* 
*The three preceding species are strictly congeners. They differ in several respects 
from the type of the genus Conyza, and with such species as shall be found truly 
allied to them, should form a sub-genus at least in this family ; to which may be given 
with some slight variation the character I have inserted at the head of this genus. 
Leptogyne. Involucrum imbricatum, squamis appressis. Corollulce foem. plurim* in 
ambitu, graciles, 5-dentatee; herm. steriles ? in centro, inpendibuliformes, 5-fidse. Se- 
mina cylindrica, pubescentia. Pappus pilosus. Receptaculum nudum. 
This however will be found to approach very to the reformed character which 
JR. Brown proposes fojr the Gnaphalium. 
