ORDER 70. COMPOSITES. 459 



flowers is frequently cultivated as a hardy annual. St. about 3f high, striate, 

 einooth, erect, with, alternate, clasping Ivs. Fls. large, terminal, solitary, yellow. 

 Aug. 



2 C. carmattun TVilld. Annual] Ivs. bipinnate, fleshy, smooth ; invol. scales 

 carinate. Native of Barbary. Hds. large and beautiful ; disk purple, rays white, 

 with a yellow base. A variety has rays entirely yellow. JL Oct. (C. tricolor 

 Andr.) 



3 C. Sinense Sabine. Perennial; Ivs. coriaceous, stalked, sinuate-pinnatifid, 

 dentate, glaucous ; rays very long. A native of China, where it hs.s long been 

 cultivated and highly esteemed for its beauty. A great number of varieties have 

 been produced with double, semidouble, and quilled flowers of every possible 

 shade of color. It is of- very easy culture in any common soil. The plants are 

 propagated by divisions, by suckers, and by cuttings. (Pyrethrum Sinense DC.) 



75. TAN ACETUM, L. TANSY. (Said to bo a corruption of ZOavaaia, 

 deathless ; for the durable flowers.) Involucre hemispherical, imbri- 

 cate, the scales all minute ; receptacle convex, naked ; pappus a slight, 

 membranous border ; achenia witn a large, epigynous disk. Lvs. alter- 

 nate, much dissected. Fls. yellow, discoid. 



T. vulgare L. Lvs. pinnately divided, segments oblong-lanceolate, pinnatifid and 

 incisely serrate; his. fastigiate-colymbous, ray fls. terete, tubular, 3-toothed. If. 

 in old fields arid roadsides. Stems clustered, 2 3f high, branched above into a 

 handsome corymb of yellow flowers. Aug. The whole plant has a strong and 

 aromatic smell and bitter taste. Tho seeds are anthelmintic. A variety called 

 double tansey occurs, with dense and crisped leaves. Eur. 



2 T. Huronense Nutt. Lvs. bipinnately divided, lobes oblong, often again pin- 

 natifld ; hds. large, corymbd ; ray fls. flattened, unequally 3 to 5-cleft. Shores of 

 Lake Huron and Mackinaw Strait, to Hudson's Bay. Plant 1 to 3f high, some- 

 what tomentous. Hds. larger than in No. 1, citron-yellow. 



76. ARTEMIS'IA, L. WORMWOOD, &c. (Probably from Artemis, 

 one of the names of the goddess Diana.) Involucre ovoid, imbricate, 

 with dry, connivent scales ; receptacle without pales ; disk-flowers 

 numerous, , tubular, ray flowers few, often without stamens and with 

 a subulate corolla or none ; achenia with a small disk ; pappus 0. 

 Bitter herbs. Lvs. alternate. Cor. yellow or purplish, discoid. 



Receptacle villous or hairy. Flowers all fertile Nos. 1, 2 



Receptacle naked. Flowers all fertile. Leaves or segments laaceolate Nos. 8, 4 



Flowers all fertile. Leaves or segments linear .Nos. 5, 6 



Flowers of the disk sterile. Leaves or segments linear Nos. 79 



1 A. frfgida Willd. Lvs. pinnately parted, silky canescent, Ifts. linear and 3 5- 

 cleft ; heads nodding, globuos, in panic-led racemes; scales of the in vol. canescent, 

 roundish, the inner oblong; corollas glabrous. Rocky hills, Minnesota, Dakota, 

 and westward. Plant branched from base, 6 12'. July Aug. 



2 A. Absinthium L. COMMON WORMWOOD. Lvs. multifid, clothed ivith short, 

 silky pubescence, loth sides ; segments lanceolate ; hds. hemisperical, drooping ; re- 

 ceptacle hairy. if Growing among rubbish, rocks, and by roadsides, N. Eng., 

 Can. Stems angular, branched, with erect racemes of nodding, yellow flowers. 

 Tho whole plant is proverbially bitter, and of powerful medicinal qualities as a 

 tonic, stomachic, &c. Eur. 



3 A. Ludoviciana Nutt. Canescently tomentous all over ; Ivs. lanceolate, lower 

 incisely and remotely serrate or subpinnatifid, upper entire ; hds. ovoid, subses- 

 sile, arranged in a simple, slender, leafy panicle. 2f Lake and river shores, Mich, 

 to Mo. W. to Oreg. Stem 2 5f high, simple or branched. Leaves quite vari- 

 able in size and also in pubescence, sometimes nearly smooth. Heads small and 

 crowded. 



4 A. vulgaris L. MUGWORT. Lvs. canescent-tomentous beneath, cauline ones pin- 

 natifid, segm. lanceolate, acute, subdantate, floral ones entire, linear-lanceolate,' 



