COMPOSITE. 189 



ativcly few anil small. Beads large, solitary on the branches, with 20 to 30 showy 

 white" rays, and numerous yellow disk flowers. (Chrysanthemum Ltucanthcmum. 

 Liim.) 



41. PYRETHRUM, linn. Feverfew, 



involucre hemispherical; imbricate ; scales with mem- 

 braneous margins. Receptacle naked. Pappus a mem- 

 braneous margin crowning the achenia. — European herbs, 

 chiefly perennials, with alternate haves, and white flowers. 



P. parthenium, L. Feverfew. 



Stem erect ; leaves petiolate, flat tripinnate ; segments orate ; heads on branching" 

 corymbose peduncles ; involucre pubescent. Several varieties are common in cul- 

 tivation, and are in great favor with many florists, on account of their pure white 

 double flowers, borne on a pyramidal corymb. 



42. CHRYSANTHEMUM, Linn. 



Qt. Itusos, gold, anthos. flower ; many species bearing golden colored flowers.- 



Heads many-flowered ; ray-flowers pistillate, ligulate. 

 12 or more ; disk-flowers perfect. Involucre imbricate, 

 hemispherical; scales with membraneous margins. Re- 

 ceptacle naked. Pappus none. — Annual and perennial, 

 ornamental cultivated plants natives of China and other Eastern 

 countries, with alternate lobed leaves and large thowy heads of flow- 

 ers, 



1. C. coronarium, L. SJmuy Aster. 



Stem branched; leaves bipinnatifid, broader at the summit, acute. Annual. Na^ 

 tive of S. Europe and N. Africa. Aug. Stem about 3 feet high, striate smooth, 

 erect, with alternate clasping leaves. Flowers large, terminal, solitary, of a deep 1 

 yellow color, double in cultivation. 



2. C. carinatum, Willd. Three-colored Chrysanthe- 

 mum. 



Mostly smooth; leaves bipinnato,' fleshy; involucre scales carinate. Native of 

 Barbary. Annual. July— Oct. Heads largo and beautiful; disk purple, rays 

 white with a yellow base. 



3. C. sinense, Sitbine. Chinese Chrysanthemum. 



Leaves coriaceous, petiolate, serrate-pinnatifid, dentate, glaucous; rays very nu-' 

 merous, long. Native of China, where it has long been cultivated and highly es- 

 teemed for its beauty. Numerous varieties have been produced, with double, 

 semi-double and quilled flowers of every possible shade of color. Blooming in No- 

 vember, when all other flowers have disappeared, makes them desirable plants for 

 avery flower garden. 



43. TANACETUM, Linn. Tanzy. 



Said to be a corruption of athanasia, undying, from its durable flowers. 



Heads many-flowered, nearly discoid, all fertile; the niax«- 



