394 COMPOSITE. Artemisia. 



34. ARTEMISIA. Li7in. ; DC. prodr. 6. p. 93. WORMWOOD. 



[ Named from Artemis, the Diana of the Greeks.] 



Heads discoid, few- or many-flowered, heterogamous ; the central flowers perfect (either 

 fertile, or sterile by the abortion of the ovary) and 5-toothed ; the marginal pistillate in a 

 single series, with a tubular 3-toothed corolla ; or sometimes homogamous, with all the 

 flowers perfect. Scales of the involucre imbricated, mostly dry, and with scarious margins. 

 Receptacle flattish or convex, naked or villous. Achenia obovoid, with a small epigynous 

 disk, without a pappus. — Herbs, or shrubby (bitter and mostly aromalic)plants, with alternate 

 usually pinnately divided leaves. Heads in spikes or racemes, which are mostly paniculate. 

 Corolla yellow or purplish. 



§ 1. Dracdnculcs, Bess. Receptacle naked: heads heterogamous ; the dish-flowers sterile. 



1. Artemisia Canadensis, Miclix, Wild Wormivood. 



Biennial ? , smooth or canescent ; radical and lower cauline leaves bipinnately divided, 

 petiolod , 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. Jl. 2. p. 129 ; Nutt. gen. 2. p. 144 ; Torr. 

 compend. p. 287 ; Beck, hot. p. 211 ; DC. prodr. 6. p. 99 ; Torr. 4- Gr. Jl. N. Am. 2. 

 p. 417. A. peucedanifolia, Juss. ex Bess.; DC. l. c. 



Stem about 2 feet high, sometimes decumbent at the base. Radical leaves clustered, silky 

 underneath. Racemes rather loose. Heads larger than in the preceding species. 



Sandy shores of Lake Erie and Lake Ontario {Dr. Knieskern and Dr. L. C. Beck). July 

 - August. Nearly allied to the following. 



2. Artemisia caudata, Michx. Tall Biennial Wortnwood. 



Biennial, smoothish ; stem erect, paniculate ; upper cauline leaves pinnately, the lower and 

 radical 2 - 3-pinnatcly divided ; the segments linear-setaceous, divaricate ; racemes disposed 

 in a strict elongated panicle ; heads ovate-globose ; exterior scales of the involucre ovate, the 

 inner elliptical, scarious. — MzcAa:.^. 2. p. 129 ; Nutt. gen. 2. p. 114 ; Ell. sk. 2. p. 318 ; 

 Ton: compend. p. 287 ; Beck, hot. j>. 21 1 ; DC. prodr. 6. p. 97 ; Torr. <^ Gr. jl. N. Am. 

 2. p. 417. A. Canadensis, Bigel. jl. Bost. p. 299. 



Stem 2-4 feet high, rather slender. Primordial leaves forming a tuft, pinnately compound, 

 with very narrow segments which are smooth above and slightly pubescent underneath ; the 

 petioles 3-6 inches long : lower cauline leaves sessile, mostly bipinnately divided. Raceme* 

 very numerous, forming a dense pyramidal panicle. Heads mostly erect, about two lines, 

 long; the scales of the involucre shining, of a grayish color, with a dull purple midrib: 

 pedicels shorter than the heads. 



Sandy scacoast of Long Island. August - September. 



