184 ORDER 70. COMPOSITE. 



scales all minute. Recep. convex, naked. Pap. a slight membranous borw 

 der. Cyp. with a large, epigynous disk. Lvs. alternate, much dissected. 

 Flowers yellow, discoid. 



1 T. vulgare L. Lvs. pinnatifid, segm. oblong-lanceolate, pinnatifid aud cut-serrate; 



hds. fastigiate-corymbous, ray-fls. terete, tubular, 3-toothed. y. Waysides. 2-3f. Aug. 



2 T. Huroneiise Nutt. Lvs. bipinnatifid, lobes oblong, often again pinnatifid; heads 



large, corymbed ; ray-fls. flattened, unequally 3-5-cleft. 2f Sandy shores, W. 2 3f. 



75. CHRYSANTHEMUM, L. Invol. bell-shaped, sc. imbricated, sea- 

 rious at the edges. Recep. flat or convex, naked in the disk. Rays ? , disk- 

 fls. $ , 5-toothed. Cyp. angular or compressed. Pap. or tooth-like. Plants 

 ornamental, from E. Asia, with alternate, lobed Ivs. and large rays. Fig. 387. 



PYRETHRUM. Cypselae wingless, angular, all alike. Plants perennial Nos. 18 



CHRYSANTHEMUM. Cyp. of the ray 3-angled, of the disk compressed. Nos. 4, 5 



1 C. SINENSE. Shrubby ; Ivs. sinuate-pinnatifid, thick, glaucous ; rays much longer than 



the obtuse scales. Beautiful flowers of all colors, late in Autumn. 2 3f. 



2 C, INDICUM. Shrubby; leaves incisely-pinnatifid, thin, flaccid; rays little longer than 



the obtuse scales, spreading about 1'. Heads much smaller than in No. 1. 



3 C. ROSEUM. Perennial, glabrous ; Ivs. 2-3-pinnatisect ; hds. solitary, terminal ; scales 



brown-edged ; rays rose-colored or white, often double, li Heads 1' broad. 



4 C. CORONARIUM. Annual ; Ivs. clasping, bipinnatifid, lobes dilated at summit ; flowers 



large, terminal, yellow ; pappus none. S. Europe. 3f. Varieties double, <fcc. Aug. 



5 C. CARINATUM. Tricolored C. Annual ; Ivs. thick, bipinnatifid ; scales carinate ; rays 



white, yellow at base, disk purple. Barbary. 1 2f. Flowers all Summer. 



76. ARTEMISIA, L. WORMWOOD, &c. Invol. ovoid, imbricate, with 

 dry, connivent scales. Recep. without pales. Disk-fls. numerous, $ , tubu- 

 lar ; ray-fls. few, often without stamens and with a subulate corolla or none. 

 Cypsela with a small disk. Pappus 0. Bitter herbs. Leaves alternate. 

 Heads yellow or purplish, discoid. Aug., Sept. 



ABSINTHIUM. Recep. villous or hairy. Fls. all fertile, heterogamous Nos. 1, 



S ABR6TA.NUM. Recep. naked. Fls. all fertile. a Lvs. or segm. lanceolate. .Nos. 3, 4 



a Lvs. or segm. linear Nos. 5 7 



DRACUNCULUS. Recep. naked. Disk-fls. sterile. b Lvs. trifid or entire... Nos. 8, 9 



b Lvs. pinnatisect....Nos. 1012 



1 A. Absinthium L. Common W. Leaves multifid, clothed with short silky down 



both sides ; seg. lanceolate ; hds. hemispherical, drooping. Waysides, N. l-2f. Eur. 



2 A. frigida Willd. Lvs. silky canescent. the cauline pinnatifid ; seg. linear, 3-5-cleft ; 



hds. small, glob., drooping ; inner sc. woolly. Rocky hills, Minn. Dak., and W. 6--12'. 



3 A. LiUdovIcla.ua N. Canescent-tomentous ; leaves lanceolate, the lower serrate or 



pinnatifid, upper entire ; heads ovoid, in a slender, leafy panicle, y. Shores, Mich, 

 and W. 2 5f. Heads small and crowded. 



4 A. vulgaris L. Mugwort. Lvs. canescent-tomentous beneath, pinnatifid with lan- 



ceolate segments, upper entire ; heads erect, ovoid, subsessile, in a branched panicle. 

 Waysides, N. and W. 3f. Europe. 



5 A. ABR6TANUM. Southernwood. Hoary; leaves bipinnatisect ; heads hemispherical, 



nodding, downy. From S. Europe. 3f. [ding. Eur. 3f. 



6 A. P6NTICA. Roman W. Lvs. hoary beneath, 2-3-pinnatisect ; heads globular, nod- 



7 A. biennia Willd. Erect, glabrous, simple ; Ivs. 1-2-pinnatifid, lobes sharply serrate 



or cut, those above subentire ; hds. globular, erect, epicate, in a virgate, leafy panicle. 

 @ Common westward, migrating E. to Po'keepsie (Gerard), and to Pa. l-3f. Aug * 



