290 COMPOSITE. (COMPOSITE FAMILY.) 



70. TANACETUM, L. TANSY. 



Heads many-flowered, nearly discoid ; flowers all^ fertile, the marginal chiefly 

 pistillate and 3-5-toothed. Involucre imbricated, dry. Receptacle convex 

 naked. Achenes angled or ribbed, with a large flat top ; pappus a short crown. 

 Bitter and acrid strong-scented herbs (ours perennial), with 1 -3-pinnately 

 dissected leaves, and corymbed heads. Flowers yellow; in summer. (Name 

 of uncertain derivation. ) 



T. VULG\RE, L. (COMMON TANSY.) Stem (2 - 4 high) smooth ; leaf- 

 lets and the wings of the petiole cut-toothed ; corymb dense ; pistillate flowers 

 terete, with oblique 3-toothed limb ; pappus 5-lobed. Var. CRf SPUM has the 

 leaves more cut and crisped. Escaped from gardens to roadsides ; Atlantic 

 States. (Nat. from Eu.) 



1. T. Huronense, Nutt. Hairy or woolly when young, stout (1-3 

 high) ; lobes of the leaves oblong; heads large (--' wide) and usually few; 

 pistillate flowers flattened, 3-5-cleft; pappus toothed. St. John's River, 

 Maine ( G. L. Goodale), shores of the upper Great Lakes, and westward. 



71. ARTEMISIA, L. WORMWOOD. 



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

 pistillate, or sometimes all similar and perfect. Involucre imbricated, dry and 

 scarious. Receptable small and flattteh, naked. Achenes obovoid, with a 

 small summit and no pappus. Herbs or shrubby plants, bitter and aromatic, 

 with small commonly nodding heads in panicled spikes or racemes ; flowering 

 in summer. Corolla yellow or purplish. (Ancient name of the Mugwort, in 

 memory of Artemisia, wife of Mausolus.) 



1. Receptacle smooth ; marginal flowers pistillate and fertile ; disk-flowers per- 

 fect but sterile, the style mostly entire; root perennial, except in n. 1. 

 * Leaves dissected. 



1. A. caudata, Michx. Smooth (2-5 high); upper leaves pinnately, 

 the lower 2 - 3-pinnately divided ; the divisions thread-form, diverging; heads 

 small, the racemes in a wand-like elongated panicle ; root biennial. Sandy soil, 

 coast of N. H. to Va. ; also Mich, to Minn., and southward. 



2. A. Canadensis, Michx. Smooth, or hoary with silky down (1-2 

 high) ; lower leaves twice-pinnately divided, the upper 3 - 7-divided, the divi- 

 sions linear, rather rigid ; heads rather large, in panicled racemes. Northern 

 N. Eng. to the Great Lakes, Minn., and northward. (Eu.) 



* * Leaves entire or some 3-cleft. 



3. A. dracunculoides, Pursh. Tall (2-5), somewhat woody at base, 

 slightly hoary or glabrous ; leaves linear and entire or the lower 3-cleft ; heads 

 small and numerous, panicled. Sandy banks of streams, Minn, to 111., Mo., 

 and westward. 



4. A. glauca, Pall. Strict, 1-2 high, somewhat woody at base, minutely 

 silky-pubescent or glabrate ; leaves linear- to oblong-lanceolate ; heads as in 

 the last. Sask. to Minn. (Sib.) 



5. A. filif61ia, Torr. Suffruticose, finely canescent, 1-3 high; leaves 

 all filiform, the lower commonly 3-parted ; heads very small and numerous, 

 crowded in a long leafy panicle. Central Kan. to Neb., and south west ward. 



