318 CLASS XIX. ORDER If. 



SUPERFLUA. 



338. ARTEMISIA. 

 Artemisia Canadensis. Mx. Sea Wormwood. 



Stem decumbent; leaves linear-pinnalifid; branches 

 bearing spikes ; flowers hemispherical; calyx scarious. 



Stem somewhat woody, smooth or pubescent. Leaves com* 

 pounded of linear segments, once or twice pinnatifid. Flowers 

 small, very numerous, in terminal panicles resembling spikes. — 

 On the sea beach, Plum Island. — August. — Perennial. 



339. TANACETUM. 

 Tanacetum vulgare. L. Tansy. 



Leaves doubly pinnatifid, doubly serrate, naked. 



Common tansy is naturalized on banks and road sides, where 

 its deep yellow flowers make a handsome appearance. It is a 

 leafy plant, two feet high with flattish terminal corymbs. Odor 

 strong, somewhat aromatic. — August. — Perennial. 



340. CONYZA. 



CoNYZA CAMPHORATA. Bluhl. Spicy Couyza. 



Leaves ovate-lanceolate, somewhat pubescent, acute, 

 serate, serratures mucronate; flowers in crowded co- 

 rymbs. 



Syn. Erigeron Camphoratum. L. 

 CoNYZA Marilats'dica. Mich. 



An erect, rather succulent plant, of low stature. Stem thick, 

 fleshy, pubescent. Leaves alternate, sessile, ovate. Branches 

 axillary, leafy, hearing close corymbs of oblong, purple flowers. 

 The plant, when bruised, exhales a strong, spicy, but rather dis- 

 agreeable odor. — Salt marshes. — Cambridgeport. — August. 



341. GNAPHALIUM. 

 Gnaphalium margaritaceum. Common Life Everlasting. 

 Herbaceous; leaves linear lanceolate, acuminate, 



