184 COMPOSITE. DiPLOPAPPUs. 



& D. amygdalinus, Hook. ! Ji. Bor.-Am. 2. p. 23. D. amygdalinus, Dar- 

 lingt..'fl. Cest. p. 473. Doellingeria u mbellata, iVees, Ast. p. 178. Diplo- 

 stephium umbellatum, DC. I. c. Aster umbellatus, ^^ Mill. diet. ed. 7. no. 

 2" ,• Ait. ! Kew. {ed. 1) 3, p. 199 ; Willd. spee. 3. p. 2030 ; " Hoffm.phytogr. 

 II. p. 74, t. B. f. 2." (ex Nees.) ; Bigel. fi. Bost. ed. 2. p. 310. A. amyg- 

 dalinus, Michx.! fl.2. p. 109; Pursh, ft. 2. p. 549; Ell. I. c. (partly); 

 Torr. ! compend. p. 300 ; Lindl. hot. reg. t. 1517. 



/?. low and small ; corymb simple. — Diplostephium amygdalinum, /3. hu- 

 milius, DC! I. c. 



Moist thickets, &c. Canada! and Nova Scotia! and common throughout 

 the Northern and North Western States ! to the mountains of South Carolina. 

 /?. Newfoundland, Pylaie ! Mr. Morrison ! S^'c. Aug,-Sept. — Stem 2-5 

 feet high, simple below, above with rather strict corymbose branches. 

 Leaves 3 to 4 or 5 inches long, either narrowly lanceolate or oblong-lanceo- 

 late, glabrous, pale beneath. Scales of the involucre (not longer than the 

 ripe achenia) slightly pubescent and ciliate. Achenia obovoid oblong, some- 

 what compressed, 3-5-nerved or ribbed. Pappus pale or tawny. 



7. D. obovaius : clothed with a minute short pubescence : stem terete, 

 corymbose at the summit; leaves closely sessile, oval, elliptical, or occa- 

 sionally somewhat bbovate, mostly obtuse at each end, conspicuously re- 

 ticulated, tomentose-pubescent beneath; heads rather numerous; scales of 

 the involucre, linear, acute, pubescent and viscid, imbricated in about 3 

 series; achenia pubescent- villous. — Chrysopsis obovala, Nutt.! gen. 2. p. 

 152. Solidago Noveboracensis, iVfM/iL .' herb. Aster obovatus, jBW. sJc. 2. 

 p. 368. Diplostephium boreale, Spreng. syst. 3. p). 544. D. obovalum, 

 DC. prodr. 5. p. 273. Dixllingeria obovata, Nees, Ast. j}- 182. 



[3. corymb dichotomous-paniculate; peduncles elongated, naked; heads 

 fewer. — Aster dichotomus. Ell. ! sk. 2. p. 366. Diplostephium dichotomum, 

 DC. I.e. 



Damp shady soil, S. Carolina and Georgia, LeConte! Nuttall ! Elliott! 

 to Florida, Dr. Chainnan! Dr. Leavenicorih ! June-Oct. — Stem 2-3 feet 

 high, often numerous from the same root. Leaves numerous, 2-3 inches 

 long, an inch or more wide, somewhat membranaceous, often a little nar- 

 rowed towards the base, slightly puberulent-scabrous above ; the veins di- 

 verging at right angles from the midrib, and conspicuously reticulated beneath. 

 Heads as large as in D. cornifolius, either loosely corymbose, or somewhat 

 paniculate, usually on slender tomentose-pubescent peduncles. Involucre 

 shorter than the disk, at length scarcely exceeding the slender achenia. 

 Rays 10-13, white (sometimes tinged with purple), nearly thrice the length 

 of the involucre. Achefiia oblong, about 5-angled or nerved, scarcely com- 

 pressed. Pappus white, or at length tawny; the exterior not very copious ; 

 the interior very obscurely, if at all, thickened towards the summit. — The 

 plant is sometimes considerably branched ; and, according to Elliott, the leaves 

 are rarely toothed. We have met with no specimen in Elliott's herbarium 

 under the name of Aster obovatus; but his A. dichotomus is a mere state of 

 this species. 



t Doubtful Species. 



8. D. leucopiliyllus (Lindl.): shrubby? woolly throughout; branches short, 

 bearing smgle heads ; leaves thick, oval, acute, crenate, narrowed into a 

 petiole ; scales of the squamose involucre linear, membranaceous, the upper 

 ones naked ; achenia tomentose, fusiform ; exterior pappus short ; the inner 

 very unequal, subulate. Lindl. in DC. prodr. 5. j)- 278. 



California. — Probably collected by Douglas, but this is not mentioned. 

 We have ventured to adduce this species as a synonym of Corethrogyne fila- 

 ginifoUa ; with which, however, the character does not altogether accord. 



