136 GAMOPETALOUS EXOGENS 



Stem 1 to 2 or 3 feet high. Radical leaves 1 to 4 or 5 inches long, tapering to S 

 petiole 1 to 3 inches in length ; stem-leaves narrower, tapering almost to a petiole< 

 Heads of flowers in secund racemes, on recurved branches (often in axillary clus- 

 ters); involucre smoothish; scales lance-oblong, obtuse ; rays 6 to 9, gpatulate- 

 oblong ; akenes pubescent with white hairs. 

 Hob. Old fields; roadsides, and borders of woods: common. PL Aug. Fr. Octo. 



Obs. This common species is easily known by its ash-colored or 

 bluish-gray aspect. 



**** Heads small; leaves lanceolate, %-ribbed. 



14.^8. CanadensiS, . Stem roughish-pubescent ; scales of 

 the involucre sublinear, rather obtuse ; akenes scabrous-pubescent. 

 CANADIAN SOLID AGO. 



Stem 2 to 5 or 6 feet high, stout and simple, somewhat corymbose-paniculate ut 

 summit. Leaves 2 or 3 to 5 or 6 inches long, acute or acuminate, sessile, roughish 

 above, softly pilose and somewhat hoary beneath. Heads of flowers in secund ra- 

 cemes, on recurved branches; rays inconspicuous. 

 Hob. Hilly woodlands; fence-rows, &c.: frequent. Fl. Aug. Fr. Octo. 



15. S. serotilia, Ait Stem smooth, often purplish and glau- 

 cous ; scales of the involucre lance-oblong, rather acute, ciliate ; 

 akenes finally smoothish. 



S. gigantea. FL Cestr. ed. 2. p. 455. not of Ait. 

 LATE SOLIDAGO. 



Stem 4 to 7 or 8 feet high, stout. Leaves 2 to 4 inches long, acuminate, roughish 

 above and on the margin, -subsessile. Heads of flowers in secund paniculate ra- 

 cemes; rays rather larger than in the preceding species. 

 Hob. Low grounds; borders of thickets : frequent. Fl. Aug. Fr. Octo. 



$3. Stem corymbosely branched; heads smalt, sessile in little clusters; receptacle 

 JimbriUate. [EUTHAMIA, JVutt.] 



16. S. lanceolata, L. Leaves lance-linear, acute, very entire, 

 somewhat scabrous ; corymbs terminal, flat-topped. 

 LANCEOLATE SOLIDAGO. 



Stem 2 to 4 feet high, m-uch branhed, angular-striate, with green and yellow 

 stripes, roughish-pubescent. Leaves 2 or 3 to 5 inches long, narrow, sessile. Heads 

 of flowers aggregated in clusters at the summit of tfee corymbose branches; invol- 

 ucre smoothishj shining and slightly viscid ; scales lance-oblong, rather obtuse, 

 appressed, deeper green at apex ; rays 15 to 20, small ; akenes pubescent. 

 Hob. Moist low grounds ; borders of thickets : frequent. Fl. Aug. Fr. Octo. 



196. CHRYSOP'SIS, Nutt. 



[Gr. Chrysos, gold, and Opsis, aspect ; in allusion to the yellow florets.] 

 Heads many-flowered; rays numerous. Involucre campanulate, or 

 turbinate; scales linear, imbricated, without herbaceous tips, Akenes 

 compressed, obovate-oblong, hairy; pappus double, the outer row of 

 short chafiy bristles. Receptacle flat. Chiefly perennials: silky - 

 villous, or hairy ; heads rather large, terminal, corymbose. 



1. C. Mariana, Nutt. Silky-lanuginous ; stem rather stout, 

 leafy; leaves spatulate-lanceolate and elliptic-oblong, nearly en- 

 tire. 

 Diplopappus Marianus. Hook. $ Fl. Cestr. ed. 2. p. 475. 



