Artemisia frigida Willd.

Artemisia frigida Wilid. Sp. PI. 3: 1838. 1804
Artemisia procumbens Schrad.; DC. Hort. Monsp. 80. 1813.
Artemisia sericea Hutt. Gen. 2: 143. 1818. Not A. 5eri«o Weber. 1775.
Artemisia pumila Link, Enum. 2: 316. as synonym. _1822.
Artemisia virgata Richards, in Frankl. Journey App. 747. 1823.
Artemisia jeniseensis "^'iWA.; S-pren%.. Sys.. 3: 489. 1826.
Absinthium frigidum Besser, Bull. Soc. Nat. Mosc. 1: 251. 1829.
A perennial herb, with a cespitose woody caudex, or suffruticose with decumbent or ascending stems, 2-4 dm. high; annual branches erect, rather simple, silkyor viUous-canescent ; leaves 1-3 cm. long, silvery-canescent, twice tematelj' or quinately dissected into Unear or linearoblanceolate divisions, the basal ones crowded, the cauline ones often with fascicles of smaller ones in their axils; heads nodding, subsessile or short-peduncled, heterogamous, in narrow leafy panicles, with erect racemiform branches, or sometimes in simple racemes; involucre hemispheric, 3-4 mm. high, 5-6 mm. or in the racemose form even 7 mm. broad; bracts whitevillous, about 20, in 3 series, sub-equal in length, those of the outermost series linear and herbaceous, the rest lanceolate, acute, with yellow or brown scarious margins; ray-flowers 12-15; corollas 1.5 mm. long; disk-flowers 30-50; coroUas narrowly funnelform, 2-2.5 mm. long; achenes about 1 mm. long, striate.
Type locality: Davuria [Eastern Siberia].
Distribution: Minnesota and Manitoba to Alaska, British Columbia, Arizona, and Texas; introduced in the east from Nova Scotia to Ontario and New Jersev; also native of Siberia.