COMPOSITACEAE (COMPOSITE FAMILY) 231 



BB. Rays 10-20; pappus none; akenes oblong, faintly 3-5-ribbed; herbage sweet- 

 scented. W. E. Medicinal plant. M. chamomille (GARDEN CAMOMILE) 

 AA. Heads rayless. W. C. E. M. suaveolens (PINEAPPLE WEED) 



CHRYSANTHEMUM (CHRYSANTHEMUM) 



Perennial. Leaves alternate, incised or dissected. Heads large. Ray 

 flowers white. Disk flowers yellow. (Gk. chrysos = gold, anthos = a 

 flower ; some species outside our range even have yellow rays.) 



A. Heads 1-2 cm. wide, many, corymbose; rays 10-20, about twice as long as wide; 



pappus a toothed crown. E. C. parthenium (FEVERFEW) 



AA. Heads 2.5-5 cm. wide, few, terminal; rays 20-30, 4 or more times as long as 



wide; pappus none. W. A very bad meadow weed. 



C. leucanthemum (OX-EYE DAISY) 



COTULA 



Leaves alternate. Heads many-flowered, with 2 kinds of flowers; re- 

 ceptacle naked. Outer flowers pistillate, in 1-3 rows, apetalous. Inner 

 flowers 4-toothed, yellow, perfect. Pappus none or a mere ring. (Gk. 

 kotula a small cup, referring to the hollow at the base of the clasping 

 leaves.) 



A. Herbage glabrous or very nearly so. W. 



C. coronopifolia (SALT-MARSH BUTTERHFAD) 

 AA. Herbage pubescent. W. C. australis 



TANACETUM (TANSY) 



Perennial, aromatic. Leaves alternate, entire to dissected. Heads with 

 i or 2 kinds of flowers ; receptacle naked. Pappus none or crownlike. 

 (Said to be from Gk. athanatox immortal ; referring to the durable flowers.) 



A. Leaves 2-s-lobed or parted, but some of the leaves may be entire. 



B. Leaf lobes linear. E. T. capitatum 

 BB. Leaf lobes not linear or none of the leaves lobed. E. T. nuttallii 



AA. Leaves pinnately-parted or -dissected into many segments. 



C. Herbage quite pubescent. 



D. Herbage silky with white hairs; heads many, 6-8 mm. wide. E. 



T. potentilloides 

 DD. Herbage villous-pubescent; heads 1-8, 12-16 mm. wide. W. 



T. huronense (SEASHORE TANSY) 



CC. Herbage glabrous or very nearly so; heads many, 6-10 mm. wide. W. 

 Medicinal plant. T. vulgare (GARDEN TANSY) 



ARTEMISIA (SAGEBRUSH) 



Herbs or shrubs, annual or perennial, bitter, aromatic. Leaves alternate. 

 Heads rayless, small ; flowers of i or 2 kinds, white or yellowish ; receptacle 

 naked or woolly. Outer flowers pistillate and inner perfect, or all perfect. 

 Pappus none. (Honor of Artemisia, the wife of Mausolus.) 



