DiPLOPAPPUs. COMPOSITiE. 183 



p. 2039 ,• Bisel.fi. Bost. ed. 2. x>. 313. A. infirmus, Michx. ! fl. 2. p. 109. 

 A. humilis, Pwrs/?,/. 2. p. 548 (excl. syn. IVilld.) ; Ell. sk. 2. p. 366. 

 Chrysopsis humilis, Nutt. gen. 2. p. ]o3 ? 



Woodlands &c. from (Canada, Michaux,) Massachusetts, New York ! 

 and Pennsylvania! to Virginia ! and the mountains and upper country of 

 the Southern States! Aug.-Sept. — Stem 1-2 feet high, sometimes flexuous. 

 Leaves somewhat rhombic-oblong or oval (the uppermost oblong-lanceolate), 

 tapering to the base and almost petioled, 2-4 inches long, 1-2 wide. Heads 

 larger and much fewer than in the following, 2-5 on the somewhat pani- 

 culate branches; or very loosely corymbose at the summit. Scales of the 

 involucre oblong-lanceolate, obtuse, slightly pubescent ; the innermost 

 shorter than the disk, the exterior very short. Achenia large, obovoid, 

 fuscous, turgid, but evidently compressed, 7-8-nerved, viz : with one nerve 

 on each margin, and 3 on one side and 2 or 3 on the other. Pappus reddish- 

 brown ; the "exterior very copious ; a large portion of the interior clavellate 

 and obtuse. — A very distinct species. 



* * The longer bristle?, of the inner pappus slightly thickened towards the summit 

 {under a lens), but scarcely clavellate : appendages of the style short, triangular-subu- 

 late or oblong. 



5. D. amygdalinus : stem slightly striate, smooth, or scabrous above, co- 

 rymbosely branched at the summit; leaves ovate-lanceolate, oblong, or some- 

 times oval, more or less acute or acuminate, scabrous-ciliolate, sessile, or 

 abruptly narrowed into a slight petiole ; heads numerous, in loose corymbs ; 

 scales of the short involucre loosely imbricated, obtuse ; achenia minutely 

 hairy. — Aster amygdalinus. Lam. diet. 1. p. 305 ? (excl. syn. Ast. Acadiensis, 

 &c. Tourn. herh.) ; Ell.! I. c. (partly.) A. humiVis,^ Willd. spec. 3. p. 

 2038, c*^- hort. Berol. t. 67, fide Nees. Chrysopsis amygdalina, Nutt. I. c. ? 

 Diplostephium amygdalinum, Cass, in diet. sci. nat. 37. p. 486.'' Dcellin- 

 geria amygdalina, Nees, Ast. p. 179. 



/3. stem branching ; heads rather large. — D. corniMius, Lindl. ! in herb. 

 Torr. (partly.) 



y. more scabrous and rigid ; heads smaller. — Dosllingeria cornifolia, 

 Lindl..' in Hook.! compan. to bat. mag. 1. p. 98. 



Moist places. New Jersey ! Pennsylvania? and throughout the Southern 

 States ! i3. Alabama, Dr. Gates ! Louisiana, Dr. Hale ! Arkansas, Dr. 

 Pitcher! y. homsiana, Dnuyrmond! Dr. Leavenivorth! Aug.-Sept. — Stem 

 1-3 feet high, often producing straggling branches. Leaves shorter and 

 broader than in the following, sometimes ovate or oval and obtuse, but usually 

 acute or acuminate. Scales of the involucre scarcely longer than the mature 

 achenia, nearly glabrous. Achenia and pappus nearly as in D. umbellatus. _ 

 — Both this and the following species are subject to considerable variation, 

 and perhaps are not always readily discriminated, but we think they are dis- 

 tinct. This species is nearly confined to the southern portion of the United 

 States, while the following abounds in the Northern States and Canada. 

 They are not satisfactorily distinguished by those who recognize two species, 

 and a portion of the synonymy is very uncertain. Perhaps the original A. 

 amygdalinus, as well as A. umbellatus, was founded on the present species 

 (as 'is certainly the case with the plant cited from Tournefort's herbarium), 

 although Lamarck's plant is said to have been derived from Virginia. 



6. D. umbellatus : stem striate, smooth or somewhat scabrous, fastigiafe- 

 corymbose at the summit; leaves elongated lanceolate, attenuate-acuminate, 

 tapering at the base usually into a slight petiole, the margins ciHate-scabrous; 

 heads numerous, usually in fastigiate corymbs ; scales of the short involucre ob- 

 tusish, rather closely imbricated ; achenia minutely hairy. — D. umbellatus 



