ORDER 70. COMPOSITE. 419 



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

 reddish in fading. Aug., Sept. 



13. TUSSILA'GO, Tourn. COLT'S-FOOT. (Altered vfrom 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. 11 Lvs. radical. Fls. yellow, with 

 vory narrow rays. 



T. farfara L. A low plant in wet places, brooksides, X. and M. States, and is 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 the flower is withered, 5 to 8' by 3 to G'. 

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

 neath, and on downy petioles. ? 



14. NARDOS'MIA, Cass. (Gr. vdpdog, spikenard, 6<7jur/, 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. 2 Lvs. radical. Fls. 

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

 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, the lobes coarsely dentate. In swamps, 

 Fairhaven, Yt. (Robbins), Sunderland, Mass. (Hitchcock) TV. to R. Mts. Yen- 

 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 the barren plants almost inconspicu- 

 ous. May. 



15. ADENOCAITLON, Hook. (Gr. dfyv, a gland, /eavAoc, a stem ; 

 i. e., glands stipitate.) Heads discoid, few-flowered ; corollas all simi- 

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

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

 stalked glands above ; pappus none. 2T_ 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 the 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 ; achenia silky-villous ; pappus simple, copious, capillary, that of 

 the ray similar. 2|! Herbs corymbed, with alternate Ivs. Rays cyanic. 

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

 tire ; invol. ovoid, half as long as the 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, pale purple. Aug. Oct 



17. SERICOCAR'PUS, Xees. WHITE-TIPPED ASTER. (Gr. orjpiKo^ 

 silken, Kop-rroc, fruit.) Heads few-flowered ; ray flowers 4 to 6, ? ; disk- 

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

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



