Aster. COMPOSIT.^. 105 



Pvrsh! fl. 1. p. 552; Ell. sk. 2. p. 365. A. dlvaricafus, Livn. spec. 2. p. 

 873/ (fide herb..') excl. syn. Gronov. df Pluk. Kurybia corymbos-a, Cass, 

 in did. sci. Jiat. 27. p. 487; Necs, Asl. p. 143; Lindl. ! bot. rei . t. 1532; 

 Hook.! fl. Bar.- Am. 2. p. 14 ; Darlingl.! fl. Cest. p. 469. Biotia corym- 

 bosa, DC' prndr. 5. p. 265. 



Dry woodlands, Canada and Northern Slates! to the middle country or 

 mountains of the Southern States! July-Auc- — Stem 1-2 feet high, fjla- 

 brous, or pubescent towards the summit, wliere it brandies into a loose (often 

 somewhat leafy) corymb. Leaves very thin and membranaceous, 2-4 or 5 

 inches long, sfrongly serrate with sharj) and sfireading rather distant and 

 irregular teeth, which are tipped with conspicuous mucronate-acuminate 

 points, glabrous or sparsely hairy above, and often hairy on the midrib and 

 veins beneath, as also the slender petioles, varying from broadly ovate to 

 ovate-lanceolate, but all except the uiipermost cordate: the upper rarely with 

 margined petioles; the uppermost sessile and sparingly serrate. Heads 

 smaller than in the following species, the outer scales of the involucre 

 (smootb, except the clliate-pubescent margin) rounder and less rigid. Pap- 

 pus tawny. Achenia nearly glabrous when mature. — Lindley cites the As- 

 ter cordifolius of Michaux as a synonym of this species, on the authority of a 

 specimen communicated by A. Richard : but, if we mistake not, tiie chief 

 specimens of his ])roper herbarium accord with the Linncean A. cordifoUus. 



2. A. macrophylliis (Linn.) : stem stout, somewhat striate-angled, roughish- 

 pubescent above, the corymbose branches also rigid; leaves thickish, sca- 

 brous, closely serrate, somewhat acuminate; the radical and lower ones 

 (large) cordate, on slender petioles; the upper sessile or on margined peti- 

 oles; heads in ample corymbs; involucre nearly the length of the disk; the 

 exterior scales rigid, oblong or ovate-oblone; rays (white or purplish) 12-15. — 

 Li7m..' spec. (ed. 2) 2. p.' 1232; Ait. Kew. {ed. 1) 3. p. 207; Michx.! fl. 1. 

 p. 114; Wllld. spec. 3. p. 2037; Pvrsh! fl. 2. p. 552. Eurybia macro- 

 phylla, Cass, in did. sci. nat. 27. p. 467 ; JSees, Ast. f. 140 (excl. syn. Ast. 

 divaric. &c.) ; Darlivgt.! fl. Cest. p. 465; Hook.! fl. Bor.-Avi. 2. p. 14. 

 Biotia macrophylla, DC! prodr. 5. p. 265. 



(3. stem and leaves nearly smooth and glabrous; heads usually smaller. 

 — Aster Schreberi, Aees, synojjs. p. 16; Sprevs;- syst. 3. p. 535. Eurybia 

 Schreberi, Nees ! Ast. p. 138. Biotia Schreberi, DC! I. c. (Varies, with 

 the beads somewhat gloinerate on short pedicels, and the rays shorter; appa- 

 rently an accidental state. Eurybia glomerata, Bernh. in Nees, Ast. I. c. 

 Biotia glomerata, DC! I. c.) 



y. exterior scales of the involucre broadly ovate or roundish-oval; other- 

 wise as in a. 



Woodlands, Canada! (from the Saskatchawan !) and Northern States! 

 Aug.-Sept. — Stem 1^-3 feet high, usually broadly corymbose; the upper 

 portion, as well as the pedicels and involucre, clothed with a close puberu- 

 lence which appears glandular or viscid under a lens, often with roughish 

 hairs intermixed; below, as also the petioles, either smooth or Avith a rough 

 pubescence. Radical leaves 4-10 inches long and 3-6 in widili, varying 

 from roundish-cordate to cordate-oblong, serrate with broad and short mucro- 

 nate teeth, often sparsely hirsute, and usually hairy on the midrib and strong 

 veins beneath; the petioles 4-12 inches long : cauline leaves smaller, ovate 

 or oblong; the upper closely sessile; the lower abruptly narrowed into a 

 margined or winged petiole. Heads mostly large : the involucre about half 

 an inch in diameter; the exterior rigid scales pubescent-ciliate, acutish or 

 obtuse; the innermost much larger and membranaceous. Pajipus tawny, or 

 reddish. Achenia linear, obscurely striate, almost glabrous when mature. — 

 There are certainly but two species of Biotia indigenous to the United Slates. 

 B. (Eurybia, Nees) commixta, DC. is of doubtful origin; but perhaps it is 

 only a form of this species. 



VOL. II.-14 



