194 PROCEEDINGS OP THE AMERICAN ACADEMY 



= = Leaves on both faces and stem minutely cinereous-pubes- 

 cent : flowering in sjiring ; the inflorescence hardly secund. 



S. VEKNA, M. A. Curtis in Torr. & Gray, Fl. 



== = == Leaves thin and loosely veiny, or firmer when growing 

 in arid places ; but veins and veinlets on the lower face gener- 

 ally conspicuous and reticulated ; heads small ; bracts of the 

 involucre rather few and narrow ; akenes pubescent. 



[S. ELLiPTiCA, Ait. Unknown in the wild state ; see p. 181. 

 S. plantaginea, Desf., is tlie same.] 



a» Rays few (1 to 3) or none : leaves cLisping. 



S. AMPLEXiCAULis, Torr. & Gray, but not of Martens. 



b. Rays 4 to 6, or rarely none : leaves sessile by a narrow base, 

 pinnately veiny : pubescence of spreading hairs, or none. 



S. RUGOSA, Mill. Diet. ed. 6 ; Willd. Spec. iii. 2058. Virga-aurea, 

 &c., Dill. Elth. 406, 410, 411, t". 304, 305, 308, mentioned by 

 Linnaeus under his S. altissima, but not referred to it, as was com- 

 monly supposed, and not really any part of the Linncean S. altis- 

 sima, for which it was taken by subsequent botanists. S. ahissima 

 and S. aspera, Ait. Kew. ; Willd., «S:c. S. scah'a, Muhl., in Willd., 

 I.e. S. vilJnsa, Pursh. S. hnmilis, Desf., a low form, with inflores- 

 cence hardly spreading or secund. S. hirta, Willd. Enum. S. rig- 

 idula, Bosc, in hort. Par. (?) S. asperafa, »Soland. in herb. Banks., 

 therefore of Pursh as to the type. S. pilosa, recurvata^ Virgin- 

 iana, and altissima, as well as rugosa. Mill. Many but indefinite 

 varieties. 



S. ULMi FOLIA, INIuhl. in Willd. S. laterijlora, Ait. Kew., but not of 

 Linnaeus. S. multijlora, Desf., appears to be a cultivated form of 

 it. — Var. MICROPHTLLA, S. microphylla, Engelm. in herb., is a 

 rigid and small-leaved southern form, from Texas. 



= ^ = = Leaves of firmer texture and less conspicuous reticu- 

 lation, not scabrous or hardly so, commonly glabrous as are 

 the stems : bracts of the involucre broader, obtuse. 



S. Elliottii, Torr. & Gray, connects with the preceding. It is 

 S. elliptica (?), Ell., also of Torr. & Gray, Fl., as to plant from New 

 York, &c. But not the original aS'. elliptica, of which no indige- 

 nous representative has yet been identified. 



S. LiNOiDES, Torr. & Gray, Fl., but not of Solander. 



