COMPOSITES (THISTLE FAMILY) 



53 ARTEMISIA. 



1 a Segments of leaves linear 2 



b Segments of leaves oblong, lanceolate, or ovate 4 



2 a Leaves white- woolly beneath 



COMMON MUGWORT. (A. vulgaris.) 

 b Leaves sometimes hairy but not white-woolly beneath 3 



3 a Heads in a leafy, branched panicle; bracts of involucre 



ovate; flowers greenish .. WILD WORMWOOD. (A. caudata.) 

 b Heads in a racemose-panicle; bracts of involucre lanceo- 

 late to obovate; flowers yellowish 



SOUTHERNWOOD. (A. abrotanum*) 



4 a Plant shrubby; receptacle of head hairy; heads nodding 



COMMON WORMWOOD. (A. absinthium.*) 

 b Plants not shrubby; receptacle of head not hairy; heads 



erect 5 



5 a Heads in spikes; bracts of involucre oblong 



COMMON MUGWORT. (A. vulgaris.) 



b Heads in spike-like racemes, bracts of involucre lanceo- 

 late or oblong; plant usually white-woolly through- 

 out BEACH WORMWOOD. (A. stellariana*) 



54 TUSSILAGO COLTSFOOT. (T. fdrfara.) 



55 PETASlTES BUTTER-BUR. (P. petasites.*) 



56 ERECHTiTES FIRE-WEED. (E. hieracifblia.) 



57 SYN6SMA. .SWEET-SCENTED INDIAN PLANTAIN. (S. suavtolens.) 



58 SENfcCIO. 



1 a Twining vine, cultivated in pots 



GERMAN IVY. (S. mikanioides*) 

 b Erect herbs 2 



2 a Plants cultivated for their foliage 3 



b Plants not cultivated for their foliage 4 



3 a Plant white-woolly DUSTY MILLER. (S. cineraria*) 



b Plant not white-woolly; leaves often spotted 



LEOPARD PLANT. (S. kdempferi*) 



4 a Ray flowers wanting; all leaves more or less pinnatifid 



COMMON GROUNDSEL. (S. vulgaris.) 

 b Ray flowers present; basal leaves not usually pinnatifid 5 



5 a Basal leaves round-ovate, heart-shaped at the base 



GOLDEN RAGWORT. (S. aureus.) 

 b Basal leaves tapering at the base into winged petioles 6 



6 a Basal leaves obovate or oblanceolate, rounded at the 



apex ROUND-LEAF SQUAW- WEED. (S. obovatus.) 



b Basal leaves usually oblong, rarely oblanceolate, not 

 noticeably rounded at the apex 



BALSAM GROUNDSEL. (S. balsamitae.) 



59 CINERARIA CINERARIA. (C. cruenta.*) 



238 



