OF NORTH AMERICA 35 



814. STREBLANTHUS AURICULATUS Raf. as 



above. Stems filiform flexuose, leaves subsessile, 

 lower petiolate ovate lanceolate acuminate 

 gashed or with 1 or 2 auricles, heads axillary 

 solitary pedunculate In the Western glades of 

 Kentucky, flowers estival bluish, stems a foot 

 long quite weak, leaves commonly with some 

 notches, auricles unequal when double, involu- 

 cres linear, papillas of | horanthe very short. 



815. STREBLANTHUS H STEROPHYLUS R. Eryn- 

 gium prostratum Nut. stems filiform ftexuose, 

 leaves petiolate ovate elliptic and rounded, ob- 

 tuse retuse or subacute entire, the upper some- 

 times auriculate, heads axillary solitary pedun- 

 culate found in Arkanzas by Nuttal, and a real 

 Streblanthus very similar to the last, chief dif- 

 ference the great diversity of the leaves, quite 

 entire. The Eryngium gracile of Elliot ap- 

 pears to answer to this species. 



816. STREBLANTHUS HUMILIS R. Eryngium 

 gracile Tor. not Bald. E. balduini Spr. Dec. 

 smooth suberect dwarf, lower leaves petiolate 

 ovate acute dentate, upper sessile lanceolate 

 often triparted. heads axillary and terminal 

 from Tampa Bay in Florida, sent me byTorrey 

 for the next, quite different, only 3 inches high, 

 involucres linear as long as heads, flowers blu- 

 ish quite similar to the two last. 



817. Subgenus KL ONION Raf. differs by 

 the phoranthe convex with stiff subulate chaffs 

 like bracts longer than flowers, and no involu- 

 cre but those outer bracts,4 or 5 concave petals. 

 Here there is an approximation to Eryngium, 

 the plants are stiffer, the flowers spinescent, but 

 there is no perianthe or involucre, the leaves 

 are still opposite, the roots annual, there are 

 some male flowers, and many have only 4 sta- 



