206 COMPOSITAE 



40. TANACETDM L. 



Perennials with alternate pinnatifid leaves and corymbose heads. In- 

 volucre imbricated. Marginal flowers fertile. Pappus a short crown. 



1. T. vulgare L. Tansy. Smoothish, l°-4° high : heads abont 4'' 

 broad : marginal flowers with short 3-toothed limbs. — Occasionally escap- 

 ing from gardens to roadsides. August-September. 



41. ARTEMISIA L. Wormwood. 

 Alternate-leaved herbs with small paniculate heads of flowers. Invo- 

 lucre imbricated. Pappus none. 



Leaves glabrous or nearly so on both sides. 



Upper leaves linear, entire. 1. A. dracuneuloides. 



Upper leaves pinnately parted. 

 Plant strongly sweet-scented. 2. A. annua. 



Plant not sweet-scented. 3. A. biennis. 



Leaves strongly tomentose on both sides. 



Leaves pinnatifid. 4. A. Carruihii. 



Leaves entire. 5. A. gnaphalodes. 



Leaves glabrate above ; tomentose beneath. 



Stem strongly tomentose. 6. A. Ludoviciana. 



Stem glabrate. 7. A. Mexicana. 



1. A. dracuneuloides Pursh. Perennial, lJ°-4° high, glabrous : 

 lower leaves somewhat pinnatifid : disk flowers sterile. — Occurs locally 

 in barrens east of Dodson and west and north of Lee's Summit. August- 

 October. 



2. A. annua L. Annual, l°-5° high, glabrous : leaves 2-pinnatifid : 

 heads paniculate : flowers all fertile. — Sparingly adventized at Kansas 

 City and Independence. August-November. 



3. A. biennis Willd. Annual or biennial, l°-3° high, glabrous : 

 leaves once pinnatifid, .the divisions serrate : heads almost spicate : flow- 

 ers all fertile. — Shore of the Missouri River ; rather infrequent. August- 

 November. 



4. A. Carruthii Wood. 13'-18' high, much branched, short white- 

 canescent : lower leaves pinnatifid into 5-7 narrowly linear segments : 

 upper leaves linear, entire : flowers all fertile. — Occurs rarely as a waif 

 at Sheffield. September-October. {A. Kansana Biitton) 



5. A. gnaphalodes Nutt. Perennial, l°-3° high : stems tomentose : 

 upper leaves lanceolate or linear-lanceolate, entire : lower leaves more or 

 less incised but not pinnatifid : flowers all fertile : involucre hardly 

 tomentose-canescent : heads usually not nodding, IJ" long. — Sandy bot- 

 toms along the Missouri River near Courtney and Sibley. Not common. 

 July-October. 



6. A. Ludoviciana Nutti Stems IS'-SO' high, stout, densely white- 

 tomentose : leaves as in A. Mexicana Willd. : beads often nodding, 2" 

 long : involucre densely white tomentose-canescent. — Dry barrens and 

 prairies throughout the southern part. September-October. 



