AND GENERA OF PLANTS. 397 



Lepidanthus suaveolens. 



Hab. In Oregon. Generally in open wastes, or by the banks of streams. Santolina suaveolens, 

 PuRSH, Vol. II., p. 520. Decand, Prod. Vol. VI,, p. 37. Tanacelum matricarioides. Less. 

 Syn. Gen. Compos. Artemisia matricarioides. Less, in Linnaea, Vol. VI., p. 240. Tanacetum? 

 suaveolens. Hook. Flor. Bor. Am., Vol. I., p. 327. Pyrethnim breviradiatum, (Herb. Schweinitz, 

 from Ledebour,) from Unalashka, where it was also collected by Ciiamisso. These specimens 

 are apparently depauperated with very few sessile flowers. — For several years it came up as a 

 weed in the garden of the late Mr. M'Mahon, near Philadelphia, where it was raised from seeds 

 brought by Captain Lewis. 



Division v. — Artemtsie^. (Lessing, Decand.) 

 ARTEMISIA. (Linn.) 

 Section i. Dracunculus. 



Artemisia Nuttalliana, (Besser.) A. cernua, Nutt. Gen. Am., Vol. II., p. 

 143, (1818.) A. Dracunculus, Pursh, Vol. II., p. 521. A. Dracunculoides, idem. 

 in SuppL, Vol. II., p. 742. 



Hab. Common in the open prairies, from the immediate vicinity of St. Louis to the Rocky 

 Mountains. 



Section ii. Seriphidium. (Bess.) Receptacle nahed; capitulum homogamous. 



Artemisia * Plattensis; h ', leaves softly and sericeously villous, cinereous, 

 filiform-linear, revolute on the margin, simple and trifid towards the summit; 

 capituli very small, tomentose, ovate, nodding and pedicellate, disposed in a 

 loose and regularly simple-branched panicle. 



Hab. Upper plains of the Platte, and nearly to the Kansa agency. A whitish silky leaved 

 shrub, three or four feet high, much branched, the branches slender and virgate. Flowers very 

 small. Sepals ovate, unequal, none of them scariose. The scent similar to that of A. Abrotanum, 

 nearly allied to Jl.filifolia of Torrey, but the flowers are loosely paniculate. 



Artemisia *foliosa; h ; leaves covered vs^ith a very short, dense tomentum, 

 green or canescent, filiform-linear, revolute on the margin, simple and trifid 

 tovs^ards the summit; axills leafy; capituli roundish, tomentose, sessile, clus- 

 tered in a narrow panicle with an angular racliis; scales oval or round, the 

 inner scariose. 



Hab. Common round Monterrey, in Upper California. Nearly allied to the last, but distinct in its 

 inflorescence. Leaves about one and a half inches long, the undivided part resembling a petiole, 

 VII. — 4 z 



