246 American Midland Naturalist Monograph No. 7 



22. Stem grayish-puberulent; leaves oblanceolate, cre- 

 nate-dentate or entire, puberulent on both 

 sides, the lower long-petioled ; fields, roadsides, 

 sand dunes, and open woods, common. Aug.- 

 Oct. Field Goldenrod [S. longipetiolata Mack. 



& Bush] S. nemoralis Ait. 



2. Heads in dense terminal compound coiymbiform cymes; bracts 



often longitudinally striate. [Oligoneuron Small). 



23. Leaves oval or elliptical, scabrous on both sides, crenate; 



stem pubescent or puberulent throughout; prairie soil, 



mostly along roads throughout 111., rare in the southern 



counties. Aug. -Sept. Rigid Goldenrod S. rigida L. 



23. Leaves lanceolate or linear, glabrous; stem glabrous, or 

 puberulent above. 

 24. Inflorescence pubescent or puberulent; stem-leaves en- 

 tire, recurved, somewhat conduplicate, sheathing at 

 the base; moist ground, locally nearly throughout 

 Illinois except the s. counties. Aug.-Sept. Riddell 



Goldenrod S. riddellii Frank 



24. Inflorescence, as well as the rest of the plant, glabrous; 

 leaves flat; moist ground, rare; Cook, Kane, Lake, 

 McHenry, Peoria, and Woodford counties. Aug.- 

 Sept. Ohio Goldenrod S. ohioensis Riddell 



1. Heads sessile or subsessile, in flat-topped corymbs; leaves punc- 

 ticulate; ray-flowers more nimierous than the disk-flowers; re- 

 ceptacle fimbriolate. {Eutharuia Nutt.). 

 25. Stem and peduncles hirtellous; leaves minutely rough- 

 pubescent on veins and margins, the median leaves 3-8 mm 

 wide, 5-veined, i.e., with 3 prominent and 2 faint veins; rays 

 12-20; moist ground, common throughout 111. Aug. -Oct. [S. 

 graminifolia of auth., not (L.) Salisb.; S. lanceolata of 



auth., not L.; E. nuttallii Greene] S. hirtella (Greene) Bush 



25. Stem glabrous; pedimcles glabrous, glutinous; leaves scabrel- 

 lous or glabrous, the median 2-4 mm wide, 1 -veined, often 

 with a pair of more or less distinct lateral nerves ; rays 6-12; 

 moist ground, common throughout 111. Aug.-Oct. [S. tenui- 

 jolia of auth., not Pursh; S. rernota (Greene) Friesn. ; S. 

 pnglabra Friesn.] S. media (Greene) Bush 



17. BelHs L. 



B. perennis L. English Daisy. Occasional in lawns and waste 

 ground; introd. from Eur. May-June. 



18. Boltonia L'Her. 



L Stem-leaves conspicuously decurrent, 1-2 cm broad; achenes 

 2.5-3 mm long; phyllaries spatulate; alluvial bottoms along the 

 Illinois R. in Fulton, La Salle, Mason, Peoria, Tazewell, and 

 Woodford counties B. decurrens (T. & G.) Wood 



