394 COMPOSIT/E. Artemisia. 



34. ARTEMISIA. Linn. ; DC. prodr. 6. p. 93. woiiMWOOD. 



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



Heads discoid, few- or manv-flowered, helerogamous ; the central flowers perfect (citlier 

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

 single series, with a tubular 3-loothed 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 aromatic) plants, with alternate 

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

 Corolla yellow or purplish. 



^ 1. DRAcrNCCLus, Bess. Receptacle naked: heads helerogamous ; the disk-Jlmcers sterile. 



1. Artesiisia Canadensis, Michx. Wild Wor7}iwood. 

 Biennial ? , smooth or cancscent ; radical and lower cauline leaves bipinnately 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. Jl. 2. p. 129 ; Null. gen. 2. p. 144 ; Torr. 

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

 p. 417. A. peucedanifolia, Juss. ex Bess.; DC. I. 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. Knieshern and Dr. L. C. Beck). July 

 - August. Nearly allied to the following. 



2. Artemisia caudata, Michx. Tall Biennial Wormwood. 



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

 radical 2 - S-pinnatel}' 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, scmons. — Michx. jl. 2. p. 129 ; Nutt. gen. 2. p. 114 ; Ell. sk. 2. p. 318 ; 

 Torr. compend. p. 287 ; Beck, hot. p. 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. Racemes 

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

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

 pedicels shorter than the heads. 



Sandy seacoast of Long Island. August - September. 



