Artemisia. COMPOSITE. 369 



Am. Phil. Soc. vii. 399 ; Torr. & Gray, Fl. ii. 419. Arid grounds in the Rocky Mountains 

 of Wyoming, Montana, and Idaho, Nuttall, Fremont (without flowers), Parry. Has been 

 wrongly referred to the following section of the genus. 



A. pycnocephala, DC. A foot or two high, either herbaceous or with a woody base, 

 densely silky-villous, even to the involucre, robust : leaves 1-3-piuuately parted into rather 

 few and short linear or spatulate lobes: heads numerous (2 lines broad), glomerate in an 

 elongated and interrupted spiciform leafy thyrsus. Gray, Bot. Calif, i. 404. A. pycno- 

 ceplialu & A. pachystachya, DC. 1. c. 99 & 114; Torr. & Gray, 1. c. A. pycnostaclnja, Nutt. 

 1. c., error in name. Oligosponis pycnocephahis, Less, iu Linn. vi. 524. Sea-shores, Cali- 

 fornia, from Monterey to Humboldt Co.; first coll. by Chamisso. 



w- -H- Leaves mostly entire, occasionally some 3-cleft, or the lowest even more divided: base of 

 steins rather lignescent. 



A. glauca, PALL. Minutely silky -pubescent or canescent, sometimes glabrate and glaucous : 

 stems strict, a foot or two high : leaves rather short, from linear- to oblong-lanceolate : heads 

 nearly of the next, into which it probably passes. Willd. Spec. iii. 1331 ; Bess. Dracunc. 

 55, & DC. 1. c. A. (jlauca, v&r.fastiyiata, Bess. 1. c. A. drucuiiculoides, var. incana, Torr. & 

 Gray, Fl. ii. 410. Saskatchewan and Minnesota, Drummond, Nicollet, Kennicott. 

 A. dracunculoides, PUKSH. Glabrous, wanting the scent and taste of A. Dracitncuhis, 

 which it much resembles : stems 2 to 4 feet high, either virgately or paniculately branched : 

 leaves narrowly or sometimes more broadly linear: he;uls very numerous in a compound 

 and crowded or open and diffuse panicle. I'ursh, Fl. ii. 742; Torr. & Gray, Fl. ii. 416. 

 A. Dracunculus, Pursh, Fl. ii. 521. A. cernua, Nutt. Gen. ii. 143. A. inodora, Hook. & Arn. 

 Bot. Beech. 150. A. Nuttnl/iana, Bess, in Hook. Fl., &c., shorter-leaved form, with lower 

 leaves more freely 3-cleft. Plains, Missouri to Saskatchewan and Brit. Columbia, aud from 

 Texas to Arizona and California. Polymorphous. 



A. LEWISII, Torr. & Gray, Fl. ii. 417, appears to be a fictitious species. The plant referred 

 to A. Santonica by Pursh is wholly obscure. The specimen in herb. Michaux, with no indication 

 of source, which Besser made a var. Americana of A. rariabills, Tenore, is without much doubt 

 European. The plant of Eugelmann, referred to by Besser in Liunrea, xv. Ill, is an imperfect 

 specimen, probably of A. Canadensis. 



-i H H Suffruticose : heads very small and numerous, few-flowered. 



A. filifolia, TORR. Minutely canescent, even to the 3-6-flowered involucre, 1 to 3 feet high, 

 with virgate rigid branches, very leafy : leaves all slender filiform, commonly 3-parted ; the 

 upper and those in axillary fascicles entire : heads crowded in an elongated leafy panicle: 

 receptacle small, not pilose. Ann. Lye. N. Y. ii. 211 ; Torr. & Gray, Fl. ii. 417; Torr. in 

 Marcy Rep. t. 12. A. Plattensis, Nutt. Trans. Am. Phil. Soc. vii. 397. Plains, Nebraska 

 to New Mexico and western borders of Texas ; first coll. by James. 



2. EUARTEMISIA. Heads heterogamous ; the disk-flowers hermaphrodite and 

 fertile, with 2-cleft style. Abrotanum & Absinthium, Bess. 



* Akenes oboA'oid or oblong, wholly destitute of pappus : receptacle beset with long woolly hairs. 

 Absinthium^ Bess. 



A. SCOpulorum, GRAY. Herbaceous, a span or two high from a stout multicipital caudex, 

 silky-cauescent : stems simple, bearing 3 to 12 spicately or racemosely disposed hemispher- 

 ical (rarely solitary) heads: radical and few lower cauline leaves pinuately 5-7 -divided, and 

 divisions 3-parted into spatulate-linear lobes; uppermost simply 3-5-parted or entire: invo- 

 lucre 2 lines broad, villous, 18-30-flowered ; its bracts brown-margined: corollas hirsute at 

 summit.' Proc. Acad. Philad. 1863, 66 ; Eaton, Bot. King Exp. 184. Alpine region of the 

 Rocky Mountains in Colorado, Utah, and Wyoming ; first coll. by Parry, Hall & Harbour. 

 Var. monocephala, Gray, 1. c., is merely a form with single head. 



A. frigida, WILLD. Herbaceous from a suffrutescent base, silky-canescent and silvery, 

 about a foot high : stems simple or brandling, bearing numerous racemosely disposed heads 

 in an open panicle : leaves mainly twice ternately or quinately divided or parted into linear 

 crowded lobes, and usually a pair of simple or 3-parted stipuliform divisions at base of the 

 petiole : heads globular, barely 2 lines in diameter : involucre pale, canescent, its outer bracts 

 narrow and herbaceous : corollas glabrous. Spec. iii. 1838 (Gmel. Fl. Sibir. t. 63) ; Pursh. 

 Fl. ii. 521 ; Ledeb. Ic. Fl. Alt. t. 462; Bess, in Hook. Fl. i. 321. A. sericea, Nutt. Gen. ii. 



21 



