412 Order 10.— COMPOSITE. 



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

 stem lvs. 5 to 1' by 3 to 5', upper about 2' by 1£', the highest oblong, smaller, 

 subtending the glomerules in the form of an invol. Scales 3 ' long. Jl. — Sept 

 2 B. tomentdsus L. St. hirsute, nearly leafless, simple or dichotomous above; 

 radical lvs. 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 trie 

 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. ETJPATORIACE.E. 



4. AGERATUM L. (Gr. a (privative) and y7/pac, old age ; i. <\, fade- 

 less ; misapplied in this case.) Heads co-flowered, £ , discoid ; scales 

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

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

 awned scales. — (J)@ Mostly tropical, with opposite, petioled lvs. and 

 corymbed heads. 



A. conyzoidea L. Branching; lvs. ovate, tooth-crcnate, 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 tho 

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

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



5. SCLERQL'EPIS, Cass. (Gr. oi<lr<p6g, hard, Ae-/c, scale.) Head 

 oo-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-angled, crowned with a cup-shaped 

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

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



S. verticillata Cass. In shallow water, N. 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 tho top of tho stem. Jl. — Sept. (Sparga- 

 nophorus ilx.) 



6. CARPHEPH'ORUS, Cass. (Gr. Kap<pog, chaff, </>t'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. — 2f. Sts. simple, leafy, corymbous 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 iuvolucrc roundeil-obtuse, nearly glabrous Nos. 3, 4 



1 C. pseudo-liatris Cass. Slender, erect, tomentous-pubescent ; lvs. 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., Fla. to Ala. and La. Plant strictly erect, 2f higli, 

 its tomentum grayish, lids. 15 to 20-flowered. (L. squamosa Nutt.) 



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

 late, peliolale; cauline lance-ovate, sessile, erect, tho 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. Walteri, 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; 



