SYNOENESIA SttPERFLUA. 411 



HAB. Low grounds. Aug. Sept. 1). ; stem 2 feet high, branch., 

 vill. ; leaves large ; Jl. wh. 



E. ageratoides : leaves on long petioles, subcordate, ovate, acuminate, 

 dentate, nearly smooth, triply nerved ; corymb many-flowered ; ca- 

 lyx nearly equal. 



HAB. Rocky hills. Aug. Sept. '4; stem % ft. high, smooth ; Jl. 

 num., wh., small. 



336. MIKANIA. 



M. scandens : stem climbing, smooth ; leaves cordate, repand-dentate, 

 acuminate, with divaricate unequal lobes ; flowers corymbed. 



HAB. Moist thickets. July Sept. Tj.; leaves oppos. ; corymb, 

 axil., pink. 



SUPERFLUA. 

 337. TANACETUM. Tansey. 



T. vulgare : leaves doubly pinnate, incisely serrate. 

 HAB. Old fields, &c. Aug. Sept. 1\. ; plant odor. ; flower dense, 

 yell%. 



338. ARTEMISIA. Wormwood. 



A. canadensis : stem herbaceous, paniculate, mostly erect; radical 

 leaves subpinnate, slightly tomentose ; cauline ones pinnate, seg- 

 ments subsetaceous, incised, flat, nearly smooth ; flowers subglobose, 

 sessile ; scales of the calyx scarious. 



HAB. Sandy shores. Aug. 'ij- 5 stem 3 4 feet high, brownish ; Jl. 

 glomerate. 



339. CONYZA. Marsh-fleabane. 



C. camphorata : leaves ovate-lanceolate, somewhat pubescent, acute, 

 serrate ; the serratures rnucronate ; flowers in crowded corymbs. 



HAB. Salt marshes. Aug. 71; strong-scented; stem 1 foot high: 

 Jl. purp. 



340. GNAPHALIUM. Cud-weed. 



G. plantagineum : shoots procumbent ; stem simple ; radical leaves 



ovate. 3-nerved, mucronate ; flowers dioecious. 

 HAB. Dry hills and woods. Apr. Sept. 7J.; plant downy; rad 



leaves large ; Jl. pale purp. 

 G. polycephalum : herbaceous, erect ; leaves linear-lanceolate, acute, 



smooth above, pubescent beneath; stem paniculate, tornentose, co- 

 rymbs terminal, crowded. 

 HAB. AVoods and low grounds. Aug. $jj) ; strong-scented, branch. \ 



Jl. clvst., pale yell. 

 G. margaritaceum : herbaceous ; leaves linear-lanceolate, acuminate, 



alternate ; stem branched at the top ; corymb fastigiate ; flowers 



pedicellate. 



36 



