COMPOSITES. (COMPOSITE FAMILY.) 227 



1. T. VULGARE, L. (COMMON TANSY.) Stem erect, smooth; leaves 

 twice-pinnately parted, the leaflets and the margined petiole cut-toothed ; cor- 

 ymb dense ; pistillate flowers terete ; pappus 5-lobed. Var. cui SPUM has the 

 leaves more cut and crisped. 1J. Escaped from gardens. (Adv. from Eu.) 



2. T. Huron ense, Nutt. Hairy or woolly when young, stout (l-3 

 high); leaves 2 - 3-pinnately dissected, the lobes oblong; heads large ('-f 

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

 1|. Shores of L. Huron, Superior, and northwestward. 



57. ARTEMISIA, 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 dry and scarious margins. Receptacle small and flattish, na- 

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

 plants, bitter and aromatic, 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 sterile. 



1. A. borealis, 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-pinnately parted, 

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

 racemed. 1J. Shore of Lake Superior and northward. (Eu.) 



2. A. Canadcnsis, 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- 

 cled racemes. 1J. Shore of all the Great Lakes, and northward. (Eu.) 



3. A. caudata, Michx. (SLENDER WORMWOOD.) Smooth (2 -5 

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

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

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



2. Receptacle smooth : flowers all fertile, a few pistillate, the others perfect. 



4. A. Lilldoviciana, 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. 1J. Dry banks, Lakes Huron and Michigan, and westward; 

 especially the var. GNAPHALODES, 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 pinnatifld, with the lobes variously cut 

 or entire, linear-lanceolate; heads ovoid, in open leafy panicles,, 1J. Waste places, 

 near dwellings. (Adv. from Eu.) 



6. A. biennis, Willd. (BIENNIAL WORMWOOD.) Smooth, simple (1 

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

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



