322 SYNGENESIA SUPERFLUA. 



h 

 r 



Stem about three feet high, pubescent. Leaves nearly sessile, generally 

 ovate-lanceolate, acutely denticulate, finely pubescent. Flowers in small 

 axillary and terminal leafy corymbs. Involucrmn 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 tipper country. My specimens 



are from Pennsylvania. 



Flowers August — September* 

 3. BlFRONS. 



^ 



C. herbacea, sub I Herbaceous, some- 



9 



3 



glutinosa; foliis ovali- what glutinous; leaves 

 lanceolatis, serratis, oval-lanceolate^ sei- 

 cordatis, amplexicauli- i ate, cordate^ amplexi- 

 bus; corymbis conferti- caule; corymbs densely 

 floris. j flowered, 



Sp. pL 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. Floicers in compact, fas- 

 tigiate corymbs. Female florets in the circumference of each capitulunt, 

 hermaphrodite florets few in the centre, aJl 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 



Flowers July — September.* 



I 



around 



*Th€ three preceding species are strictly cong:eners. They differ in several respect* 

 from the type of the genus Conyza, and with such species as shall be found trulj 

 allied to them, should form a sub-genus at least in this family ; to which may be given 

 irith some slight variation the character I have inserted at the head of this genus. , 



Leptogyne. Involucrum imbricatum, squamis appressis. Corollulm foero. phirim* »^ 

 ambitu, pacileSjS-deniatae; herm, steriles ? in centro, inpendibuliformes, S-fidse. oe- 

 mina cylindrica, pubescentia. Pappus pilosus. Rtcepiaculum nudum. . . 



This however will be found to approach very ne^ to the reformed character wbicD 

 B. Browa proposes for the Gn^haiium* 



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