Order 70.— COMPOSITE. 421 



17 A. ameth^-stinus Nutt. ? Clothed with a minuto hoary totnentum ; at 

 racemons-paniculate ; lvs. linear-lanceolate, entire, rough, acute, with somewhat 

 auriculate appendages at the clasping base ; invol. broad-bell-shaped ; scabs 

 hispid-pubescent, imbricated, erect, with acute squarrous, green tips ; aeh. silky. — 

 Found at Northbridge, Ms. (by Dr. Robbins, and by us). Hds. with showy blue 

 rays, expending 1'. Ditl'ers from Nuttall's descr. ia its scales which aro not of 

 equal length. Sept. 



18 A. ptmiceus L. St. hispid, paniculate ; Ivs. amplexicaul and more or les* 

 auriculate at base, appressed serrate, roughish above ; invol. loose, longer than the 

 disk, the soaks linear-lanceolate, long and revoluie, nearly equal and 2-rowed. — A 

 large, handsome aster, common in swamps and ditcher, sometimes in dry soilf, 

 N. States and Can. St. 4 to 6f high, generally red (at least on the South side), 

 furrowed, hispid. Lower lvs. with remote serratures, rough-edged and rough on 

 the upper surface, all acuminate and narrowed at base. Fls. large and showy. 

 Rays 50 to 80, long and narrow, pale-purple. Aug. — Oct. 



fl. viMiNEUS. Tall and nearly glabrous, slender ; branches divaricate-ascend- 

 ing, mostly 1-flowereJ; lvs. linear-lanceolate, sparingly appressed-serrate, 

 taper-pointed, auriculato-amplexieaul ; hds. very largo; scales leafy. — In damp 

 woods. Rays spreading 13 to 20". 



19 A. prenanthoides Muhl. St. hairy or pubescent above, corymbous-panicu- 

 lato ; lvs. oval-lanceolate, serrate, acuminate, attenuate at base into a long icinged 

 petiole which is auriculate at the insertion ; invol. imbricated with several rows of 

 linear, green-tipped, spreading scales. — Grows in low woods, N. Y. to Ky. Stem 

 2 — 3f high, with a terminal, corymbou3 panielo of large heads on short pedun- 

 cles. Rays showy, pale blua. Loaves with tho petiolo 5 to 10' long. Branch 

 leaves smaller, nearly entire. Sept. — Nov. 



20 A. lrsvis L. Very smooth; st. angular; branches simph, 1-Jbwered; lvs. 

 half-clasping, oblong, entire, sliming, radical subserrate, lanceolate, upper auri- 

 cled at base; invol. closely imbricate, tho scales broadly linear, rigid, thickened 

 and herbaceous at tho apex ; ach. glabrous. — A very smooth and beautiful species, 

 2 to 3f high, growing in low grounds. St. polished, green, often somewhat 

 glaucous ; lvs. rather fleshy, tho lowest tapering to a winged petiole. Fls. largo 

 and showy, with numerous ray3 of a fine bluo becoming purple. Sept — Nov. 

 (A. mutabilis L. A. amplexieaulis Muhl.) 



ji. L-EViG.Vrua Lvs. long, linear-lanceolate. (A. Isevigatus Willd.) 

 }-. CYAKEUS. St and lvs. conspicuously glaucous. (A. cyanous Ph.) Beau- 

 tiful varieties, especially tho latter. 



21 A concinnus Willd. not of Nees. St. simple, paniculate or racemous, pubes- 

 cent; lvs. lanceolate and lance-linear, narrowed and clasping at the base, remotely 

 serrate, upper one3 entire Invol. closely imbricate, scales green at tho tip. — 

 Woods, N. States. A slender species 1 to 2f high. Branches of the panielo 

 rather short and remote. Lvs. 3 to 5' long, acuminate, varying from £ to 1', in 

 width, smooth except tho midvein beneath, branch lv3. few and much smaller, 

 lids, middle size, with 10 to 15 bluish-purplo rays. Sept. — Nov. 



22 A sericcus Tent Sts. slender, clustered, glabrous below, silky, pubescent, 

 branched above ; lvs. clothed on both sides with a dense, appressed, silky-canes* 

 cent tomentum, lauce-oblong, entire, acuto and mucronate, sessile; hds. large, 

 mostly solitary, terminal on the short, leafy branchlets; scales lanceolate, silky- 

 caneseeut like the lvs., spreading at tip ; ach. smooth. — A singularly elegant 

 Aster, with shining, silvery foliage, prairies and river banks, Wise, and Iowa to 

 Miss. St. 1 to 2f high. Lower lvs. 2 to o' by 9 to 1G", the upper much smaller. 

 Rays deep violet-blue. Pappus fulvous. Aug. — Oet f (A. argenteus Mx.) 



23 A. concolor L. St. subsimple, erect, pubescent; lvs lance-oblong, entire, 

 mucronate, grayish, with a minute, silky pubescence both sides, upper ones cus- 

 pidate-acuminato ; rac. terminal, virgate, simple or somewhat compound, elon- 

 gated ; scales lanceolate, silky, acute, appressed ; ach. villous. — Pine barrens, N. 

 J. to Fla. A slender and virgate plant, 1 to 3f high, sometimes branched below. 

 Rt. often tuberous. Lvs. IV by 4-', reduced in size upwards. Hds. in a long 

 rac, with purplo rays and "a rust-colored pappus. Aug. — Nov. — Resembles a 

 Liatris. 



