COMPOSITE. (composite FAMILY.) 227 



1. T. vulgXee, L. (Common Tanst.) Stem erect, smooth; leaves 

 twicc-pinnately parted, the leaflets and the mai-gined petiole cut-toothed ; cor- 

 ymb dense ; pistillate flowers terete ; pappus 5-lobed. — Var. CEfspUM has tho 

 leaves more cut and crisped. 1). — Escaped from gardens. (Adv. from En.) 



2. T. Huronense, Nutt. Hairy or woolly when young, stout (lo-S" 

 high); leaves 2 - 3-pinnately dissected, the lobes oblong; heads large {^'-i 

 wide) and usually few; pistillate flowers flattened, 3 - 5-cleft ; pappus toothed. 

 U — Shores of L. Huron, Superior, and northwestward. 



57. ABTSraisiA, L. Wormwood. 



Heads discoid, few - many-flowered ; the flowers all tubular, the marginal 

 ones pistillate, or sometimes all similar and perfect. Scales of the involucre 

 imbricated, with di-y and scarious margins. Receptacle small and flattish, na- 

 ked. Achenia obovoid, with a small summit and no pappus. — Herbs or shrubby 

 plants, bitter and ai-omatic, with small heads in panicled spikes or racemes. 

 Corolla yellow or purplish. (Dedicated to Artemis, the Greek Diana.) 



^ 1. Receptacle smooth : marginal flowers pistillate and fertile : disk-flowers steriie. 



1. A. ItorealfS, Pallas. Low (3' -6' high), tufted, silky-villous or nearly 

 smooth ; lower leaves 3 - 5-cleft at the apex, or like the others 1 - 2-pinndtely parted, 

 the lobes lanceolate or linear ; heads few, hemispherical, pretty large, spiked or 

 racemed: IJ, — Shore of Lake Superior and northward. (Eu.) 



2. A. Canadensis, Michx. (Canada Wormwood.) Smooth, or 

 hoary with silky down (l°-2° high) ; lower leaves twice-pinnately divided, the 

 upper 3 - 7-divided ; the divisions linear, rather rigid ; heads rather large in pani- 

 ded racemes. % — Shore of all the Great Lakes, and northward. (Eu.) 



3. A. caudata, Michx. (Slender Wormwood.) Smooth (2°-5"> 

 high); upper loaves pinnately, the lower 2 - 3-pinnately divided ; tlie divisions 

 thread-form, spreading ; lieads small, the racemes in a wand-like elongated panicle. — 

 Sandy soil, coast of New Hampshire to New Jersey; and in Illinois. 



5 2. Receptacle smooth : flowers all fertile, u few pistillate, the others peifect. 



4. A. LiUdoviciana, Nutt. (Western Mug wort.) Whitened-wool- 

 ly throughout, branched (l°-5° high) ; leaves lanceolate, the lower mostly cut- 

 toothed or pinnatifid, the upper mostly entire, the upper surface often becoming 

 naked and smooth with age; heads ovoid, mostly sessile, disposed in narrow 

 leafy panicles. Ij. — Dry banks. Lakes Huron and Michigan, and westward; 

 especially the var. gnaphal6des, which has the elongated nearly entire leaves 

 very woolly both sides. 



5. A. VULGARIS, L. (Common Mugwort.) Branches and lower sur- 

 face of the leaves whitish-woolly ; stem-leaves pinnatifid, with the lobr's variously cut 

 or entire, linear-lanceolate ; heads ovoid, in open leafy panicles, IJ. — Waste places, 

 near dwellings. (Adv. from Eu.) 



6. A. biennis, Willd. (Biennial Wormwood.) Smooth, simple (I" 

 --3° high) ; lower leaves twice-pinnately parted, the upper pinnatifid; lobes linear, 



acute in the lower leaves cut-toothed ; heads in short axillary spikes, which are 



