Obder 70.— OOMPOSIT^. 



423 



17 A. ameth^stinua Natt. ? Clothed with a minute hoary tomentum ■ st 

 racemous-panioulate ; Iva. liaear-laaoeolate, entire, rough, acute, with somewhat 

 aurioulate appendages at the clasping base; invol. broad-beU-shaped : sccdes 



hispid-pubescent, imbricated, erect, with acute squarrous, green tips ; aoh silky 



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

 rays, expendmg 1'. Differs from Nuttall's descr. la its scales which are not of 

 equal length. Sept. 



18 A. puniceua L. St. hispid, paniculate ; Ivs. amplexioaul and more or less 

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



disk, the scales linear-taiieeolate, long and revolute, neairhj eqiial and 2-rowed. A 



large, handsome aster, common in swamps and ditches, sometimes in dry soils, 

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

 furrowed, hispid. Lower Ivs. with remote serratureg, rough-edged and rough on 

 the upper surfece, all acuminate and narrowed at base. Pis. large and showy. 

 Bays 60 to 80, long and narrow, pale-purple. Aug. — Oct. 



jS. viMiNEus. Tall and nearly glabrous, slender ; branches divaricate-ascend- 

 ing, mostly 1-flowered; Ivs. linear-lanceolate, sparingly appressed-serrate, 

 taper-pointed, auriculate-amplexicaul f hds. very large ; scales leafy. — ^In damp 

 woods. Rays spreading 18 to 20"- 



19 A. prenautholdea Muhl. St. hairy or pubescent above, corymbous-panieu- 

 late ; Ivs. oval-lanceolate, serrate, acuminate, attenuate at base into a long winged 

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

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

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

 cles. Rays showy, pale blue. Leaves with the petiole 5 to 10' long. Branch 

 leaves smaller, nearly entire. Sept. — 'Sov. 



20 A. Isevis L. Very smooth; st. angular; Iranches simple, l-flowered; Ivs. 

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

 clod at base; invol. closely imbricate, the scales broadly linear, rigid, thickened 

 and herbaceous at the apex ; aoh. glabrous. — A very smooth and beautiful species, 

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

 glaucous; lys. rather fleshy, the lowest tapering to a winged petiole. Fls.. large 

 and showy, with numerous rays of a fine blue becoming purple. Sept. — Nov. 

 (A. mutabilis L. A. amplexicaulis Muhl.) 



/3. LiEvlGlTUS. Lvs. long, linear-lanceolate. (A. laevigatas 'Willd.) 

 y. OTAUEUS. St. and lvs. conspicuously glaucous. (A. cyaneus Ph.) Beau- 

 tiful varieties, especially the latter. 



21 A. conpfnnus "WiUd. not of Nees. St. simple, paniculate or racemous, pubes- 

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



serrate, upper ones entire. Invol. closely imbricate, scales green at the tip. 



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

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

 width, smooth except the midvein beneath, branch lvs. few and much smaller. 

 Hds. middle size, with 10 to 15 bluish-purple rays. Sept.— Nov. 



22 A. sericeus Vent. Sts. slender, clustered, glabrous below, silky, pubescent 

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

 cent tomentum, lance-oblong, entire, acute and rnuoronate, sessile; hds. large 

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

 canescent 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 3' by 9 to 16", the upper much smaller. 

 Bays deep violet-blue. Pappus fulvous. Aug. — Oct. 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-acuminate ; rac. terminal, virgate, simple or somewhat compound, elon- 

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

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

 Et. often tuberous. Lvs. 1 J' by i', reduced in size upwards. Hds. in a long, 

 rac, with purple rays and a rust-colored pappus, Av^, — Nov. — Eesembies a 

 Liatris. 



