ORDER TO. COMPOSITE. 410 



Lvs. 1 to 2J' long, as wide. Fls. 20 to 50 in a head, of a beautiful sky blue, 

 reddish in fading. -ng., Sept. 



13. TUSSILA'GO, Tourn. COLT'S-FOOT. (Altered from the Lat. 

 tussis, cough ; considered a good expectorant.) Head radiate, many- 

 flowered ; flowers of the ray ?, those of the disk $ ; involucre simple; 

 receptacle naked ; pappus capillary. 2 Lvs. radical. Fls. yellow, with 

 very narrow rays. 



T. farfara L. A low plant in wet places, brooksides, N. and M. States, and i.; a 

 certain indication of a clayey soil. Scape scaly, about 5' high, simple, appearing 

 with its single, terminal, many-rayed, yellow head in March and Apr., long before 

 a leaf is to be seen. Lvs. arising after tho flower is withered, 5 to 8' by 3 to G', 

 cordate, angular, dentate, dark green above, covered with a cotton-liko down be- 

 neath, and on downy petioles. ? 



14. NARDOS'MIA, Cass. (Gr. vdf>6og, spikenard, 6ofj,f], smell ; from 

 the fragrance.) Heads radiate, many-flowered, somewhat $ $ ; flowers 

 of the ray $ , of the disk $ , but abortive in the sterile plant; involucre 

 simple ; receptacle flat, naked ; pappus capillary. 11 Lvs. radical. Fla. 

 cyanic. The ray flowers of the sterile heads arc in a single row ; of tho 

 fertile heads in several, but very narrow. 



N. palmata Hook. Scapo with a fastigiato thyrse or corymb; Ivs. roundish-cor- 

 date, 5 7-lobed, tomentous beneath, tho lobes coarsely dentate. In swarnps, 

 Fairhaven, Vt. (Robbing), Sunderland, Mass. (Hitchcock) W. to R. Mts. Very 

 rare. A coarse, acaulescent plant, with large, deeply and palmately-lobed leaves, 

 and a stout scape covered with leaf-scales and 1 2f high. The heads are frag- 

 rant, numerous, with obscure rays, those of tho barren plants almost inconspicu- 

 ous. May. 



15. ADENOCAITLON, Hook. (Gr. ddrjv, a gland, /cavAor, a stem ; 

 i. c., glands stipitatc.) Heads discoid, few-flowered ; corollas all simi- 

 lar, tubular ; flowers of the margin $, of the disk <3 ; scales of the invo- 

 lucre equal, in one series; receptacle naked; cypsela clavato, bearing 

 stalked glands above ; pappus none. 2 Nearly acaulescent, with alter- 

 nate Ivs. and small, paniculate hds., also gland bearing. 



A. bicolor Hook. St. leafy below, nearly naked above ; Ivs. deltoid, cordate, an- 

 gular-toothed, decurrent on tho petioles, glabrous above, arachnoid-pubescent be- 

 neath. Shores of L. Superior (Dr. Pitcher, fide T. & G.), to Oreg. (Hook). Sts. 

 1 to 2f high, slender. Fls. white. 



TRIBE 3. ASTEROIDE^E. 



16. GALATEL'LA, Cass. (Lat. diminutive of Galatea, from which 

 genus this was taken.) Heads many-flowered; rays few (3 to 12) ster- 

 ile, ligulate; disk-flowers , tubular ; scales closely imbricated, without 

 green" tips; receptacle alveolate, toothed; corollas of the disk deeply 5- 

 cleft ; achcnia silky-villous ; pappus simple, copious, capillary, that of 

 the ray similar. 2J! Herbs corymbcd, with alternate Ivs. Rays cyanic. 

 G. hyssopifolia Nees. Glabrous, erect, Ivs. lance-linear, acute, 3-veined, en- 

 tire ; invol. ovoid, half as long as tho disk ; interior scales obtuse, membranous, 

 outer acute, fleshy; rays 3 to 9. longer than the disk. " Md. Car. and Ga. com- 

 mon." (Darby.) Height 1 to 2f. Rays, palo purple. Aug. Oct. 



17. SERICOCAR'PUS, Nces. WHITE-TIPPED ASTBR. (Gr. arjpiKdg. 

 silken, /cap-DC, fruit.) Heads few-flowered ; ray flowers 4 to 6, 2 ; disk- 

 flowers 6 to 10, ; involucre oblong, imbricated; scales appressed, 

 white, with green spreading tips ; receptacle alveolate ; achenium obconic, 



