324 



STNGENESIA SUPERFLUA 



1. PYCNOSTACHYUM. Mich. 



P. caiile alato; foliis I Stem winged; leaves 

 lanceolatis^ sub undula- lanceolate^ slightly un« 

 tis^ denticulatis, siibtus diilate, toothed^ tomen- 



albo-tomentosis 



9 



spica 



cylindrical densiflora* 



tose and white under 

 neath; spike cylindri- 

 cal^ flowers clustered* 



Conyza Pycnostacbya. ]\Iich.2.p. 126. Pursh, 2.p.524. Nutt- 2.p.l45. 

 Gnaphalium Undulatum. Walt. p. 203- 



Root tuberous, somewhat fusiform, perennial. Stem about two feet liigh-, 

 erect, simple, and with the under side of the leaves, and calyx densely to-^ 

 mentose and white. Leaves sessile, lanceolate, widely decurrent, so as to 

 render the stem conspicuously winged. Flowers in a compact sometimes 

 compound spike ; female and hermaphrodite flowers promiscuously mingled 

 in each capitulum, all white. Involucrum imbricate, leaflets somewhat obo- 

 vate, acute, appearing to be scarious on the inner surface, densely tomentose 

 without; female florets slender, three-cleft ; stamens none; style longer than 

 the corolla, two-cleft, stigmas acute ; hermaphrodite florets with the corolla 

 deeply five-cleft ; anthers very short; style shorter than the corolla, two- 

 cleft; stigmas glandular, white. Seerf angled, pubescent. Receptacle n^^ed^ 

 fiat. 



This plant, as remarked by Michaux, should form an intermediate genus 

 between Conyza and Gnaphalium^ but it is in habit and appearance, much 

 more nearly allied to the latter than the former ; many species in the last 

 section of Conyza in Wildenow, perhaps belong to this genus. The seeds 

 of the hermaphrodite florets are probably sterile. They are certainly much 

 shorter than the others. The root under the popular denomination of Black 

 Root is much used in some parts of the country as an alterative and as ft 

 cleanser of old ulcers. 



«. 



Grows in dry sandy soils. 

 Flowers May — August- 



GNAPHALIUM. Gfn. Pl. 1282. 



Involucrum imbrica- 



tum, sq^iiamis oblongis, 

 scariosis^coloratis. Co' 

 rollulce foem. et herm. 

 immixtae. Semina gla- 

 bra. Pappus pilosiis. 

 Receplaculum nudum. 



Involucrum 



cate, 



scales 



imbri- 

 oblongj 



scarious, coloured. Flo' 

 rets fern, and herm. m 

 termingled. 



Seeds sla 



brous. Pappus hairy. 

 Receptacle naked. 



