Erigeron. composite. 177 



124; Pursh! fl. 2. p. 533; NutL! gen. 2. j). 147; Ell. sk. 2. p. 393. 

 Aster vernus, Linn.! spec. 2. p. 876 (pi Gronov. !) ; Pers. I. c. Doronicum 

 Iccvifolium, Walt. Car. p. 205 7 Stenactis verna, Nees, Ast. p. 275 ; DC. ! 

 prodr. 5. p. 299. 



Moist pine barrens, &c. Virginia ! and N. Carolina ! to Florida ! and 

 Louisiana! May-June. — Leaves variable in form, sometimes short and 

 roundish, often narrowly spatulate, with a more or less elongated tapering 

 base. Scape 1-2 feet high, slender, a little pubescent or hairy above, often 

 simple, and v^\\h few heads ; not unfrequently once or twice dichotomous, 

 the branches bearing commonly 3 heads. Rays white (sometimes purple, 

 DC), rather broad for their length in this genus, spreading, exserted the 

 length of the involucre. Appendages of the style, in the disk-flowers, short, 

 triangular, often acute. Pappus (double according to Nuttall, Nees and 

 De Candolle) in all our specimens certainly simple and in a single series ; 

 the bristles very slender, scabrous, equal, between 20 and 30 in num- 

 ber. Achenia oblong, 4-nerved, quadrangular or compressed, minutely 

 hispid. 



§ 6. Rays (30-50) in a single series or nearly so, much longer than the invo- 

 lucre: pappus double; the exterior short, setaceous or squamcllate-subulaie : 

 achenia mostly 2-nerved : receptacle areolate : perennial or svffruticose, 

 with the habit o/Diplopappus or Chrysopsis, but ivith the style and recep- 

 tacle o/'Erigeron. — Pseuderigeron. 



30. E. fill folium (Nutt.) : canescent, stems or branches numerous from a 

 woody base; leaves filiform, crowded on the sterile branches, scattered on 

 the fertile; peduncles naked, bearing single (small) heads; scales of the 

 involucre somewhat unequal, linear-subulate ; rays (white) rather few, 

 about twice the length of the disk; achenia somewhat hairy; exterior pappus 

 very indistinct. 



a. branches elongated, nearly simple ; rays about 40. — Diplopappus 

 filifolius, Hook. ! fl. '^Bor.-Am. 2. p. 21. 



(3. stems or branches paniculate-corymbose; rays 25-30. — E. filifolium, 

 Nutt. ! in trans. Amer. phil. soc. [n. ser.) 7. p. 308. Chrysopsis canescens, 

 DC. .' i)rodr. 5. p. 323. 



Oregon, from the Great Falls and barren grounds of the interior, Douglas! 

 to the" Rocky Mountains, Nuttall !—Siems 8-12 inches high; the sterile 

 branches and young leaves very canescent. Leaves 2-3 inches long, very 

 slender. Scales of the involucre rather rigid. Pappus a single series of 

 white bristles (20 or more), with a few minute setos intermixed, scarcely 

 distinguishable from the hairs of the compressed 2-nerved achenia. 



31. E. Douglasii : stem tall, glabrous, racemosely branched at the 

 summit ; the branches numerous, elongated, mostly simple and bearing 

 solitary heads, somewhat corymbose or fasti gi ate ; leaves (upper cauline) 

 linear, rigid, obtuse, scabrous with minute appressed hairs; those of the 

 branches much smaller ; rays (blue or purple) about twice the length of the 

 disk ; scales of the somewhat imbricated involucre minutely pubescent, the 

 exterior linear-subulate; the inner larger, lanceolate; achenia somewhat 

 hairy; exterior pappus minute and indistinct. — Diplopappus? occidentalis, 

 Hook. Sf Am. ! bot. Beechey, suppl. p. 350. 



California, Douglas! — The original, and only specimen we have seen is 

 imperfect, wanting the lower part "of the stem, which appears to have been 2 

 feet or more in length : the numerous and mostly simple flexuous flowering 

 branches are about 6 inches long : the only cauline leaves present about an 

 inch long, 2 lines or more in breadth, 1-nerved, and slightly veiny. Heads 

 scarcely larger than in E. Philadelphicum. Scales of the involucre narrow 

 VOL. 11.-23 



