218 (tiMrosiT.K. (composite family.) 



liuri' lu-arly as Ion;; iiii tlio diok ; the exterior scales ri^^id, witli Hpreading 

 friii;;L'(l tips; ravs aliidit 10, pale j)Ui]iie. — J^ow sliady woods, in the upper 

 disi riets. Sept. — Stem I ^"^ - 2^ '''g'l- Leaves 4' - 6' long, 2' - 4' wide. 

 §2. IIklkastuum. — Heads few und racemose, or solitarij, hirije : scales of 

 the involucre nearly equal, linear, rii/id : achenia nearly glabrous: jiajijnts 

 riyid: leaves linear, entire, or spinulose along the viaryins. 



.3. A. paludosus, Ait. Stem .-ili^jjhtly roufjliened ; leaves linear, rigid, 

 aeiile, ]i:irtl\ rl:is]]iii::;, cjften fiingctl near the base; heads 3-8, raeemed or 

 cor_vml)ed; iuvoluere hemisplierical, as long as tiie disk; the scales^ nearly 

 ecjual, linear-spatulate, with nmeronate green spreading tips. — Low gromid, 

 Florida to North Carolina. Sept.-Uct. — Stem l°-2° high. Leaves 2' -4' 

 long. Heads ^'- 5' wide. Kays numerous, deep blue. 



4. A, spinulosus, (hajtm. Rhizoraa tuberous; stem simple, pubes- 

 cent; leaves rigiil, uanow-linear, appressed, the margins fringed with bristly 

 hairs; the lowest numerous and elongated; heads 4-8 in a simple spike; 

 involucre bell-shaped ; scales etjual, lanceolate-subulate, rigid, erect, sjiine- 

 pointed, bristly near the base; achenia strongly ribbed. — Damp pine barrens. 

 West Florida, near the coast. June- August. — Stem 10'- 15' high. Lowest 

 leaves 6' -12' long, r'-3" wide; the upper cues 1' long. Heads Y wide. 

 Rays 12-15, pale blue. Pappus tawny. 



5. A. eryngiifolius, Torr. & Gray. Khizoma tuberous ; stem simple, 

 pubescent ; leaves lanceolate-linear, the lowest mostly entire ; the others erect, 

 and fringed with spiny teeth; heads vei"y large, solitary, or 3-4 in a loose 

 raceme; involucre hemispherical; scales very numerous, lanceolate, tapering 

 into a long slender recurved tip ; achenia short, oblong. — Low pine barrens, 

 Florida. June -August. — Stem l°-2° high. Lowest leaves 4' -6' long. 

 Heads 1' or more in diameter. Rays numerous, white. 



§3. Calliastrum. — Scales of the involucre imbricated in several rows, cori- 

 aceous, vsHdlly with herbaceous spreadinrj tips: rai/s 12 or more : achenia 

 nearly smooth : pappus of unequal rather rigid bristles, someivhat thickened 

 iipicard: lc<n-fs rigid, none of them cordate: heads large and showy. 



6. A. mirabilis, Torr. & Gray. Rough-pubescent ; stem corymbosely 

 branched above ; leaves ovate, mucronate serrate, sessile ; the lowest abruptly 

 narrowed into a petiole ; involucre hemispherical ; the scales oblong-linear, 

 obtuse and recurved at the summit ; achenia nearly smooth, striate. — Colum- 

 bia, South Carolina (Prof Gibbes). Sept. — Stem l°-2° high. Stem leaves 

 I' -3' long. Rays about 20, blue or violet, elongated. 



7. A. spectabilis, Ait. Stem corymbose and glandular-pubescent 

 above; leaves oblong- Lanceolate, rough (m the upper surface, .sessile and en- 

 tire; the lowest tapering into a petiole, and sparingly serrate; heads not 

 numerous, single, terminating the branches; involucre nearly hemispherical, 

 as long as the disk ; the scales linear-oblong, with obtuse and spreading glan- 

 dular tips. — North Carolina ( Curtis). Sept. - Oct. — Rhizoma slender. Stem 

 l°-2° high. Leaves 2'-4' long. Heads |' in diameter. Rays about 20, 1' 

 long, deep violet. 



8. A. gracilis, Nutt. Stem slender, slightly pubescent, corymbo.se at 

 the summit; leaves rough, oblong, partly clasping, entire; the lowest ob- 



