125. CoMPOsiTAE 245 



the stolons forming- sterile branches; leaves more 

 or less triple-veined, two of the lateral veins 

 becoming more prominent than the others; 

 prairie soil throughout 111. Aug.-Sept. Prairie 

 Golden rod [S. rn oritur a Steele; S. mis.wuriensis of 



auth., not Nutt.] S. glabcrrinia Martens 



18. Heads about 3 mm high; plants with rhizomes but 

 not strongly stoloniferous; leaves with 1 principal 

 vein; roadsides, fence-rows, open woods, fields 

 throughout 111. July-Aug. Early Goldenrod [S. 



arguta sensu auth., non Ait.] ,5". juiicca Ait. 



10. Stem hii^ute or puberulent; branches of the inflorescence 

 pubescent. 



19. 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) . 



20. Leaves lanceolate or oblanceolate. 



21. Leaves lanceolate, acuminate or acute, sharply 

 serrate or entire; bracts linear-lanceolate, 

 thin; rays 9-15; involucre 2.5-4 mm high; 

 stem 1-3 m tall; moist rich soil, chiefly 

 along roads, and in thickets and woods, 

 very common. Aug.-Oct. Tall Goldenrod 

 [S. gilvocanescens (Rydb.) Smyth; S. cana- 

 densis sensu auth., non L.] S. altissima L. 



21. Leaves oblanceolate or elliptical, dentate- 

 crenate, the upper smallei', entire; outer 

 bracts oval, obtusish, firm; rays 3-7, short; 

 stem 30-100 cm tall; bluffs and diy soil, 

 local; absent from the northern and eastern 



counties. Aug.-Oct. Rough Goldenrod 



S. radula Nutt. 



20. Leax'es broadly oval or ovate, sharply serrate, 

 puberulent; blufTs, clifTs, or rocky woods along 

 the Mississippi R., extending northw. to Pike 



Co. Sept. -Oct. Drummond's Goldenrod 



S. drummondii T. & G. 



19. Leaves with 1 principal vein (i.e., not plainly 3- 

 ribbed, the lateral veins, if present, weak). 

 22. Stem more or less hirsute, or the lower part al- 

 most glabrous; leaves lanceolate or elliptic- 

 lanceolate, sharply serrate, sessile or nearly so. 

 more or less rugulose, scaberulous above, short- 

 hirsute on the veins beneath; moist ground, 

 rare; Jackson. Lawrence, and Randolph coun- 

 ties. Aug.-Oct. Rough-leaved Goldenrod 



S. rugosa Mill. 



