Jones: Flora of Illinois, 152. Compositae 251 



11. Panicles usually as broad as long, pyramidal, the branches 



becoming elongated and recurved; rays 8-13. 



12. Heads about 5 mm. high; plants strongly stoloniferous; 



prairie soil, local; July-Sept. [5'. moritura Steele; S. 



missouriensis of auth., not Nutt.] Prairie Goldenrod 



S. glaberrima Martens 



12. Heads about 3 mm. high; plants not strongly stolonifer- 

 ous; roadsides, fields, and open woods. June-Aug. 



Early Goldenrod S. juncea Ait. 



8. Stem hirsute or puberulent (or glabrous toward the base); 

 branches of the inflorescence pubescent. 

 13. Leaves with 1 principal vein (i.e., not plainly 3-ribbed, the lateral 

 veins, if present, weak). 

 14. Stem more or less hirsute, or the lower part almost gla- 

 brous; leaves lanceolate or elliptic-lanceolate, sharply 

 serrate, sessile or nearly so, more or less rugulose, scaber- 

 ulous above, short-hirsute on the veins beneath; moist 

 ground, rare. Aug.-Oct. \_S. altissima of auth., not L.} 

 Rough-leaved Goldenrod S. rugosa Mill. 



14. Stem grayish puberulent; leaves oblanceolate, crenate- 



dentate or entire, puberulent on both sides, the lower 

 long-petioled; fields, roadsides, sand dunes, and open 

 woods, common. Aug.-Oct. [S. longipetiolata Mack. 



& Bush] Field Goldenrod S. nemoralis Ait. 



13. Leaves (at least the median and lower) more or less plainly 



3-ribbed, two of the lateral veins becoming prominent (often 



only slightly so in the upper leaves.) 



15. Leaves broadly oval or ovate, sharply serrate, puberulent; 



blufTs, cliffs, or rocky woods, s.w. III.; known from Cal- 

 houn, Jersey, and Jackson counties. Sept.-Oct. Drum- 



mond's Goldenrod S. drummondii T. & G. 



15. Leaves lanceolate or oblanceolate. 



16. Leaves oblanceolate or elliptical, dentate-crenate, the 

 upper smaller, entire; outer bracts oval, obtusish, 

 firm; rays 3-7, short; stem 30-100 cm. tall; bluffs and 



dry soil, local. Aug.-Oct. Rough Goldenrod 



S. radula Nutt. 



16. Leaves lanceolate, acuminate or acute, sharply serrate or 

 entire; bracts linear-lanceolate, thin; rays 9-15; in- 

 volucre 2.5-4 mm. high; stem 1-3 m. tall; moist rich 

 soil, chiefly along roads, and in thickets and woods, 

 common. Aug.-Oct. \^S. gilvocanescens sensu auth.; S. 



canadensis sensu auth., non L.] Tall Goldenrod 



S. altissima L. 



7. Branches of the panicle ascending or erect; heads not secund; achenes 

 glabrous; sandy or gravelly soil, or in dry open woods. Aug.-Oct. 



[5'. rigidiuscula (T. & G.) Porter.} Showy Goldenrod 



S. speciosa Nutt. 



