AND GENERA OF PLANTS. 401 
Artemisia biennis, (WiLLD.) 
Has. On the plains of the Platte, and in the Rocky Mountains. 
Artemisia pychnostachya, (DEcanp.;) herbaceous, every where softly and 
canescently lanuginous; leaves pseudopetiolate, bipinnately dissected; seg- 
ments fastigiate, oblong, acute, simple, or partly subdivided ; panicle racemose, 
very long, and of nearly equal breadth, many-flowered ; capitulun _Sessil “ 
globose, erect, about ten-flowered; sepals lanceolate, all lanugin 
Has. On the scan of Monterrey, Upper California. A species with almost the 5 feesage of 4. 
Absinthium, but very soft and lanuginous with somewhat spreading hairs. Perennial, with a 
running root. Panicle two or more feet long; branches short, the flowers clustered. (I have only 
seen the winter vestiges of this curious species.) 
Artemisia * Pacifica; herbaceous, soft, and canescently sericeous; leaves 
pseudopetiolate, bipinnately dissected, the segments often trifid, oblong or 
linear, acute; stem leaves pinnately dissected, pseudostipulate on the infertile 
shoots; stem and ovate, pedicellate capitulum, smooth. 
Has. Shores of the Pacific, at the outlet of the Oregon, in sandy places. Considerably allied to 
A. canadensis, but more tomentose, with broader and fewer segments to the leaves, the radical and 
lower leaves very much as in the last species. Perhaps 2. desertorum, y. Scouleriana of Hoox. 
Flor. Bor. Am., p. 325. 
TANACETUM. (Lessing.) 
Tanacetum Huronense, Nutt. Gen. Am., Vol. II., p. 141. TT. Douglasii, 
Decanp. Prod., Vol. VL, p. 128.” i Onin ais camphoratus, Hoox. Flor. Bor., 
Vol. I., p. 321. O. camphoratus? LEss. Sears 
Has. Coast of the Pacific to ponies common. Rays and disk pale yellow, the former 
scarcely exserted, , 
Tanacetum *boreale; softly hairy; leaves and segments also bipinnatifid, 
apiculate, rachis leafy, the leaflets pinnatifid; corymb few-flowered, (four to 
five;) sepals lanceolate, the inner with brown, scariose margins; rays conspi- 
cuous, three-lobed. 
Has. Arctic America, (Hooxer.) Apparently not the T. paucifiorum, in which the flowers are 
said to be all hermaphrodite, and the plant very smooth 
*SPHAROMERIA. 
um many-flowered, discoid, heterogamous; florets all tubular, the radial 
forint, (about five,) truncate, two or three-toothed; discal florets herma- 
phrodite, shortly five-toothed; style bifid, stigmas truncate, and minutely 
VIl.—Od A 
