OKDER LXVIII. COMI'USIT.K. 367 



cent branches. Leaves ovale, cordate, the upper spatuhite, hinceolatc, 

 glabrous, acutely serrate. Floivcrs in fostigiate corymbs; involucre 

 with pubescent, ovate-lanceolate scales ; ray florets narrow, about 12. 

 Seeds i^labrous. — AVhite, tinged Avith purple. If. Sept. — Oct. Upper 

 dist. Car. and Geo. 2—3 feet. 



39. A. azuue'us, (Lind.) Stem erect, scabrous, branches rigid, slen- 

 der, racemose. Leaves scabrous, lowest cordate, slightly serrate, higher 

 ones ovate-lanceolate, all on long petioles, the upper ones lanceolate- 

 linear, sessile, usually entire, those of the branches subulate, numerous, 

 appressed ; involucre obconic, scales closely imbricated. Achenia near- 

 ly glabrous. — Western and ISoullnvestern States. Aug. — Oct. 1 — 3 ft. 



40. A. Siiout'ii, (Hook.) Stem slender, nearly glabrous. I^eaves 

 more or less cordate, lanceolate or ovate-lanceolate, acute, glabrous 

 above, minutely pubescent beneath, mostly entire ; involucre campanu- 

 Lite, scales closely imbricate. Acltejiia glabrous. Heads racemose, nu- 

 meious, crowded, showy. — Violet-blue. Mountains. Sept. — Oct. 2— 4ft. 



41. A. asperu'lus, (T. <fe G.) Stem simple, racemose, paniculate at 

 the summit, scabrous, pubescent. Radical leaves subcordate, oblong- 

 ovate, slightly serrate, ou slender petioles; cauline ones oblong or spat- 

 ulate, sessile, rameal ones minute, scattered. Heads small, paniculate ; 

 involucre nearly hemispherical, scales oblong, closely imbricated ; ache- 

 nia minutely pubescent. — Blue or purple. Geo. 1 — 2 feet. 



42. A. Baldwin'ii, (T. & G.) Plant minutely hispid, pubescent. 

 Stem paniculately branched. Leaves sessile, rigid, entire, scabrous 

 ab .ve, oblong-linear ; those of the branches short, erect, acuminate, mu» 

 cronate. Scales of the involucre linear, acute, minutely puhe-cent, 

 loa.-ely imbricated. Acheiiia slightly lubescent. — Blue o;- purp'e. 

 Georgi '. Dry soils. 1 — 3 feet. 



43. A. mirab'ilis, (T. &, G.) Stem simple, corymbose, paniculate at 

 the sununit, scabrous, pubescent. Leaves ovate, serrate, the hiwer on< s 

 petioiate, the upper sessile, those of the branches small, roundish ; invo- 

 lucre hemispherical, scales imbricate, oblong-linear; rays numerous, 

 large. Achenia slender, striate. — Blue or violet. Columbia, S. C. 

 1—2 feet. 



Gen-US XVII.— ERIG'ERON. L. 



(From er, spring, and ger, old, from their early fudiug.) 



ILeads many-flowered ; ray florets numerous, pistilhite; thu^c 

 of the disk tubular, j3erfect; scales of the involucre narrow, 

 mostly in a single series. Receptacle flat, naked. Achenia 

 compressed. Pappus usually in a single series of scabrous 

 bristles. Heads solitary. 



1. E. nudicau'le, (Mich.) Stem erect, pubescent and scabrous near 

 the summit. Radical leaves spatulate-lanceolate, acute, irregularly 

 toothed, glabrous ; cauline ones smaller, ciliate near the base. Flowers 

 in small terminal corymbs ; involucre with acute subulate leaves, pu- 

 besci nt near the base ; ray florets numerous, somewhat o-toothed at 

 the :-uiuiuit; disk florets nutnercus, greenish-yellow, o-toothed. Seed 

 his[jid ; receptacle flat, dotted. — White. If. Through the suuuni-r. 

 Common. 1 — 2 feet. L\ vernum, T. it G. 



2. H BELLiniFo'uuM, (L) Stem hirsute, very hairy. IJadicul leav(8 



