Artemisia. COMPOSITiE. 417 



(3. Besseri : cinereous-silky ; leaves all linear-lanceolate ; heads villous 

 externally, the lower pedicellate. Bess. — A. borealis, a. Purshii, Bess, in 

 DC. I.e., excl. syn. Pursh. 



y. Wormskioldii{Bti!i.\.c.): canescent and somewhat silky; leaves on 

 short petioles; heads racemose; corolla a little hairy at the summit. — A. 

 Gra3nlandica, fVbrmsk. fl. Dan. t. 1585. 



6. spiihameea : either villous or pubescent when young, at length glabrous; 

 cauline and floral leaves either 3-5-cleft, or linear and entire ; heads spicate- 

 racemose. — A. borealis |3. Adamsii (leaves 3-5-cleft; peduncles hairy), Sfi. 

 Schangini (cauline leaves entire and linear), Bess, in DC. I. c. A. spitha- 

 masa, Pursh ! Ji. 2. p. 522. (At length glabrous throughout ; cauline and 

 floral leaves linear, entire!) 



Arctic America! from Greenland! (var. y.) and Labrador! {6.) to the 

 North West Coast! the Rocky Mountains! and Oregon! Also Keweena 

 Point, Lake Superior, Dr. Houghton! — A span high. 



4. A. Canadensis (Michx.) : perennial (or biennial ?), glahrous or canes- 

 cent ; radical and lower cauline leaves 2-pinnately divided, petioled ; the 

 upper 3-7-divided, sessile ; the segments linear or linear-lanceolate ; heads 

 (rather large) hemispherical or subglobose, in paniculate racemes; scales of 

 the involucre ovate or oval, with scarious margins. — Michx.! ji. 2. p. 129 ; 

 Nutt.! gen. 2. p. 144. A. campestris, Pursh, fl. 2. p. 521 (ex Nutt.) ; 

 Richards, appx. FranM. journ. ed. 2. p. 30. A. desertorum, y-^, Bess.! in 

 Hook. I. c. A coramutata, Bess, in DC. I. c. (at least as to the American 

 plant.) A. peucedanifolia, ^' Juss. herb. ; Bess. Drac. n. 33 ;" DC. ! I. c. A. 

 Pacifica, Null, in trans. Amer. j)hil. soc. (n. ser.) 7. p. 399. 



Shores of the Great Lakes, from the St. Lawrence River to Lake Supe- 

 rior ! and west to Missouri ! Upper Platte ! and Oregon ! extending north to 

 Hudson's Bay ! and to the Arctic Circle. — Plant 1-2 or 3 feet high, erect or 

 ascending, considerably variable, if all the Western forms really belong to 

 this species; sometimes nearly glabrous except the young radical leaves; but 

 frequently silky-canescent throughout ; the leaves somewhat rigid. The 

 heads also vary in size, but are larger than the following species. 



5. A. caudata (Michx.): biennial? glabrous; stem erect, paniculate; upper 

 cauline leaves pinnately, the lower and radical (often pubescent) 2-3-pin- 

 nately divided ; the segments linear-setaceous, divaricate ; racemes disposed 

 in a strict elongated panicle; heads (small) erect, subglobose ; exterior scales 

 of the involucre ovate ; the inner elliptical, scarious. — Michx. ! fl. 2. p. 129 ; 

 Nutt. ! gen. 2. p. 144 ; Ell. sk. 2. p. 318 ; DC. I. c. 



Barren woods and sandy soil, Illinois ! and Missouri, and from the coast 

 of New Hampshire ! and New Jersey ! to Georgia ! Aug.-Sept. — Plant 2-6 

 feet high, strict. 



6. A. Lewisii : herbaceous ; leaves on the sterile stems crowded, sessile, 

 bipinnately divided, villous (the pubescence deciduous?) ; the segments linear- 

 filiform, spreading, entire or often 2-3-parted ; heads small, few-flowered, in 

 a large open panicle ; involucre glabrous. — A. Santonica, Pursh, ft. 2. p. 521. 

 A. variabilis y ? Americana, Bess, in DC. prodr. 6. p. 94, 4* «« Linncea, 15, 

 p. 94 Sflll. 



Missouri, Lewis, {ahoherb. Michaux.) Sandy places between Fort Gibson 

 and Fort Smith, Arkansas, Dr. Engelmann !— The specimen of Dr. Engel- 

 mann consists of a young leafy stem, and a panicle of the former year. The 

 leaves of the former are not unlike those of A. caudata, but villous ; those of 

 the latter are small, pinnately 3-5-divided, glabrous ; the segments setaceous. 

 Involucre apparently glabrous; the inner scales ovate, with scarious margins. 



7. A. filifolia (Torn): canescent; stems very numerous from a thick 

 woody base, paniculate at the summit; leaves much crowded or fascicled, 



VOL. II. — 53 



