125. CoMPOsiTAE 243 



16. Solidago L. — Goldenrod 



{Euthatnid Nutt.; Oligoneuron Small) 



1. Heads distinctly pedicellate; ray-flowers usually fewer than the 

 disk-flowers; receptacle pitted; leaves not j^unctate. 

 2. Heads in panicles, racemes, or a.\illary clusters; bracts of the 

 involucre not longitudinally striate. 



3. Heads in small axillary clusters or .short racemes. 



4. Stem pubescent or puberulent; achenes glabrous or nearly 

 so at maturity. 



5. Rays cream or nearly white; involucres 3-5 mm high; 

 wooded slopes and ridges, rare. Aug.-Oct. White 

 Goldenrod S. hicolor L. 



5. Rays orange-yellow; involucres 5-8 mm high. 



6. Leaves very unequal, the lower much larger than 



the middle and upper; basal ro.settes of large leaves 



usually present ; wooded slopes and ridges, rare, 



in Alexander and Jackson counties ....S. hispida Muhl. 



6. Leaves nearly uniform or only slightly decreasing in 



size upward ; basal rosettes wanting. 



7. Margin of leaves scabrous with short incurving 



hairs; inner phyllaries attenuate; rocky woods 



or bluff's, s. 111., rare. Sept. -Oct 



.S". petiolaris Ait. 



7. Margin of leaves with long spreading hairs; inner 

 phyllaries obtuse to acute; blufTs, thickets, rocky 



woods, s. 111., rare. Sept. -Oct S. biickleyi T. & G. 



4. Stem glabrous; achenes pubescent; leaves mostly sharply 

 serrate. 

 8. Leaves unequal, the lower much larger; basal rosettes 

 present; clifTs, rare; known from Carroll, Jo Daviess, 



La Salle, and Ogle counties. Sept S. sciaphila Steele 



8. Leaves nearly uniform or only slightly decreasing in size 

 upward; basal rosettes wanting. 

 9. Leaves se.ssile, lanceolate; stem moie or less glaucous, 

 terete; woods throughout 111., except the north- 

 western counties. Aug.-Oct. Woodland Goldenrod 



S. cacsia L. 



9. Leaves with winged petioles, ovate or oval, sharply 

 serrate; stem angled, not glaucous; woods thiough- 

 out 111. Aug.-Oct. Broad-leaved Goldenrod \S. 



flcxicaulis L.] S. latifolia L. 



3. Heads mostly in terminal panicles or racemes. 



10. Stem below the inflorescence glabrous or nearly so. 

 11. Branches of the inflorescence more or less pubescent 

 or hirtellous. 

 12. Branches of the panicle spreading or recui'ved, the 

 heads distinctly secund. 



