Artemisia. COMPOSITE. 369 



Am. Phil. Soc. vii. 399 ; Torr. & Gray, PI. 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. pyonooephala, DC. A foot or two high, either herbaceous or with a woody base, 

 densely silky-villous, even to the involucre, robust : leaves 1-3-pinnately 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- 

 cephala & A. pachystachya, DC. 1. c. 99 & 114; Torr. & Gray, 1. c. A. pycnostachya, Nutt. 

 1. c, error in name. Oligosporus pycnocephalus, Less, in Linn. vi. 524. — Sea-shores, Cali- 

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



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

 stems 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. glauca, var. fastigiata, Bess. 1. c. A. dracunculoides, var. incana, Torr. & 

 Gray, Fl. ii. 416. — Saskatchewan and Minnesota, Drum.rn.ond, Nicollet, Kennicott. 



A. dracunculoides, Puksh. Glabrous, wanting the scent and taste of A. Dracunculus, 

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

 leaves narrowly or sometimes more broadly linear : heads very numerous in a compound 

 and crowded or open and diffuse panicle. — Pursh, PI. ii. 742; Torr. & Gray, PI. ii. 416. 

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

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

 leaves more freely 3-cleft. — Plains, Missouri to Saskatchewan and Brit. Columbia, and 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. Michanx, with no indication 



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



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



specimen, probably of A. Canadensis. 



H— -{— •*— Suflruticose : heads very small and numerous, few-flowered. 



A. fllif 61ia, Tokk. 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. & Gtfay, Pi. 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. EuABTEirisiA. Heads heterogamous ; the disk-flowers hermaphrodite and 



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



# Akenes obovoid 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-canescent : stems simple, hearing 3 to 12 spicately or racemosely disposed hemispher- 

 ical (rarely solitary) heads: radical and few lower cauline leaves pinnately 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 branching, 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. 



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