412 ORDER 70. COMPOSITE. 



Ohio to Fla. and La. St. 20 to 30' high, flexuous, the branches divaricate. Lower 

 stem Ivs. 5 to 7' by 3 to 5 , upper about 2' by 1^-', the highest oblong, smaller, 

 subtending the glomerules in the form of an in vol. Scales 3" long. Jl. Sept. 

 2 E. tomentosus L. St. hirsute, nearly leafless, simple or dichotomous above; 

 radical Ivs. large, hirsute-tomentous, oblong-spatulate or obovate, crenate, nar- 

 rowed to a winged petiole, cauline small and bract-like at the forks, or none ; 

 bracts thick, broad-ovate, scales rigid. S. Car., Ga., Fla., to La., common in the 

 pine woods. St. 1 to 2f, often quite simple, with a single, large glomerule at top. 

 The stiff, acute scales are 5" long. Jl. Sept. Varies with more branches and 

 leaves, towards No. 1. 



TRIBE 2. EUPATORIACE^E. 



4. AGERA^TUM L. (Gr. a (privative) and j7]pa^, old age ; i. e., fade- 

 less ; misapplied in this case.) Heads oo-flowered, $ , discoid ; scales 

 linear, imbricated, pointed ; receptacle naked ; corollas all tubular ; 

 fruit (cypsela) 5-angled, narrowed at base ; pappus 5 to 10 chaffy, 

 awned scales. d)(D Mostly tropical, with opposite, petioled Ivs. and 

 corymbed heads. 



A. conyzoides L. Branching; Ivs. ovate, tooth-crenate, acute or cordate at 

 base, somewhat rugous ; pappus of 5 subulate, denticulate scales as long as the 

 cor. but much shorter than the conspicuous branches of the style. Near Sa- 

 vannah (Pond). Sts. 12 to 18' high, downy. Lower petioles half as long as the 

 leaves. Fls. blue or white. Apr., Jn. The cultivated variety called A. Mexi- 

 caiia has nearly all its leaves cordate, and flowers always ? blue. 



5. SCLEROL'EPIS, Cass. (Gr. GK^po^ hard, Aem'?, scale.) Head 

 ao-flowered, , discoid ; scales equal, linear, in 2 series ; receptacle 



naked ; corolla 5-toothed, enlarged at the throat ; branches of the 

 style much exerted; achenia 5-anglcd, crowned with a cup-shaped 

 pappus of 5 obtuse, horny scales. 2 Aquatic, glabrous, simple, with 1 

 to 3 terminal hds. Lvs. verticillate ; fls. purple. 



S. verticillata Cass. In shallow water, K J. to Fla. St. decumbent at base, 1 

 to 2f high. Lvs. in numerous whorls of about G' linear-setaceous, entire, 1' in 

 length. Head commonly solitary at the top of the stem. Jl. Sept. (Sparga- 

 nophorus MX.) 



6. CARPHEPH'ORUS, Cass. (Gr. ndpcjiog, chaff, ^pw, to bear; for 

 its chaffy receptacle.) Heads (about 20-flowered), involucre, flowers 

 and fruit as in Liatris ; receptacle chaffy ; pales narrow, 3-veined, rigid, 

 shorter than the flowers. 2 Sts. simple, leafy, coryrnbous at top, with 

 middle sized heads of purple flowers. (Liatris, MX. Ell.) 



* Scales of the involucre acute, downy-tomentous. Nos. 1,2 



* Scales of the involucre rounded-obtuse, nearly glabrous Nos. 8, 4 



1 C. pseudo-liatris Cass. Slender, erect, tomentous-pubescent ; Ivs. nearly 

 glabrous, linear-subulate, rigid, the cauline gradually shorter, closely appressed to 

 and covering the stem ; hds. few in a racemous cyme : scales rigid, ovate-lanceo- 

 late, appressed. Gadsden Co., FJa. to Ala. and La. Plant strictly erect, 2f high, 

 its tomentum grayish. Hds. 15 to 20-flo\vered. (L. squamosa Nutt.) 



2 C. tomentosus Torr. & Gr. Erect, downy and corymbous above ; rt. Ivs. lanceo- 

 late, petiolate; cauline lance-ovate, sessile, erect, the upper pubescent; scales lance, 

 ovate, acute, mostly appressed, glandular tomentous. Swamps, Va. to Ga. St 

 2f high, bearing a loose, spreading corymb. Pales linear, pappus purplish, 

 Sept., Oct. (L. Walter!, Ell.) 



3 C. bellidifolius Torr. & Gr. Low, nearly glabrous, tufted; root-lvs. spatulate, 

 petiolate, obtuse, 3-veined, cauline mostly linear ; branches with 1 to 5 heads ; 



