OF ARTS AND SCIENCES. 193 



= Leaves all entire and glabrous, more or less pellucid-punctate. 



S. ODORA, Ait., with var. inodoka. 



!S. CiiAPMANi, Gray, Proe. Am. Acad. xvi. 80. S. odora, in part, 



Chapm. Fl. *S'. tortifoUa of Curtiss, distrib. no. 1351. Florida. 



Between »S'. odora and S. pilosa. 



= = Leaves more or less serrulate, scabrous or pubescent, very 

 numerous up to the inflorescence. 



S. TOKTIFOLIA, Ell. S. retrorsa, Pursh, and Nutt, not Michx. 

 S. PILOSA, Walt. S. Jistulosa, Mill. Diet, and the synonymy in 

 Torr. &, Gray, Fl. 



4H- ++ ++ ++ Leaves comparatively ample and obviously but not 

 prominently veiny, of rather firm texture, perfectly glabrous 

 and smooth, never much serrate : heads middle sized, crowded 

 in usually narrow and erect thyrsoid inflorescence, not secund. 



= Atlantic species : akenes glabrous or nearly so : rays conspic- 

 uous, five or six. 



S. ULIGINOSA, Nutt. Jour. Acad. Philad. vii. 101. S. stricta, Hook. 



Fl. ii. 4, in part; Torr. & Gray, Fl. ii. 204, not Ait. Although 



Nuttall appears to have had more than one plant in view, this is 



really the one upon which his species was founded. 

 S. SPECiosA, Nutt., with var. angustata, and var. rigidiuscula, 



Torr. & Gray. 



= r= Pacific and Rocky Mountain species: akenes pubescent: 

 rays more numerous and smaller. 



S. GuiKARDONis, Gray, Proc. Am. Acad. vi. 543. 

 S. SPECTABiLis. S. Guirardonis, var. spectabilis, Eaton, Bot. King. 

 154. 



++++++++++ Leaves veiny, and at least the lower serrate; 

 heads racemosely paniculate and when well developed secund,' 

 commonly in recurving racemiform clusters : Atlantic species. 



= Leaves shagreen-scabrous on the upper face, ample ; stem 

 strongly angled. 



S. PATULA, Muhl. S. asperata, Pursh, as to herb. Lamb. S. angu- 

 iata, Spreng. in herb. Willd. ; Schrader in DC. Prodr. Var. strict- 

 ULA, a southern small-leaved and stricter form. «S'. salicina. Ell., 

 ex char. S. scabrn, Hook. Comp. Bot. Mag. 



A-OL. XVII. (n. S. IX.) 13 



