1. Artemisia Caudata Michx. Tall Or Wild Wormwood

Fig. 4571. Artemisia Caudata Michx. Fl. Bor. Am. 2: 129. 1803

Root biennial (sometimes perennial?); stems slender, glabrous, tufted, strict, very leafy, 2°-6° high, at length paniculately branched, the branches glabrous, or rarely slightly pubescent, nearly erect. Lower and basal leaves and those of sterile shoots slender-petioled, sometimes a little pubescent, 3'-6' long, 2-3-pinnately divided into narrowly linear, acute lobes, about 1/2" wide; upper leaves sessile or nearly so, pinnately divided, or the uppermost entire and short; heads about 1" broad, very short-peduncled, very numerous in a large somewhat leafy panicle, mostly nodding; bracts of the ovoid-campanu-late involucre ovate, or the inner elliptic, glabrous; receptacle hemispheric, naked; central flowers sterile.

In dry sandy soil, abundant on sea-beaches, from Quebec to Florida, west to Ontario, Indiana, Manitoba, south to Nebraska and Texas. July-Sept.

2. Artemisia Borealis Pall. Northern Wormwood

Fig. 4572

Artemisia borealis Pall. Iter. 129. pl. hh, f. I. 1771. Artemisia groenlandica Wormsk. Fl. Dan. pl. 1585. 1818.

Perennial, 5'-15' high, densely silky-pubescent all over, resembling small forms of the following species. Leaves less divided, the basal and lower ones petioled, l'-2 1/2' long, the upper sessile, linear and entire or merely 3-parted; heads about 2" broad in a dense terminal rarely branched thyrsus; involucre nearly hemispheric, its bracts brown or brownish, pilose-pubescent or nearly glabrous; receptacle convex, naked; disk-flowers sterile.

Quebec to Greenland, west through arctic America to Alaska, south in the Rocky Mountains to Colorado. Also in northern Asia. Apparently erroneously recorded from Maine. July-Aug.

3. Artemisia Canadensis Michx. Canada Wormwood

Fig. 4573

Artemisia canadensis Michx. Fl. Bor. Am. 2: 129. 1803.

Root perennial (or sometimes biennial); stem pubescent or glabrous, strict, simple or branched, 1°-2° high, the branches appressed and erect. Leaves usually pubescent, but sometimes sparingly so, the basal and lower ones petioled, 2'-3' long, 2-pinnately divided into linear, acute lobes which are shorter and broader than those of Artemisia caudata; upper leaves sessile, less divided; heads short-peduncled, about 2" broad, commonly numerous in a narrow virgate panicle, mostly spreading or erect, in small forms the panicle reduced to a nearly or quite simple terminal raceme; involucre ovoid, its bracts ovate or oval, green, glabrous or pubescent; receptacle hemispheric; central flowers sterile.

In rocky soil, Newfoundland to Hudson Bay, Maine, Vermont, west along the Great Lakes to Minnesota and Manitoba and to the Canadian Pacific coast. Sea- or wild-wormwood. July-Aug.

Artemisia Forwoodii S. Wats., a taller plant of the Rocky Mountain region, with somewhat smaller heads, ranges eastward into Nebraska.