IOWA ACADEMY OF SCIENCES. 
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633. S, canadensis L. Open ground; very abundant. 
634. S. nemoralis Ait. Dry, open ground; abundant. 
A strongly marked variety with stems a foot 
long or less, spreading or nearly prostrate, and 
inflorescence large in proportion, is common in 
stony or sterile ground on dry hills; it appears to 
approach the variety arenicola Burgess. 
635. S. rigida L. Dry ground; abundant. 
636. S, riddellii Frank. Wet meadows; frequent. 
Euthamia. 
637. E. gramini folia (L.) Nutt. {Solidago lanceolata L.) 
Meadows and roadsides; common. 
Boltonia. 
638. B, asteroides (L.) L’Her. Common in swamps. 
Aster. 
639. A. azureus Lindl. Dry, open ground, or sometimes 
in moist meadows; common. 
640. A, cordifolius L. Woods; abundant. 
641. A. patents Ait. Dry, open ground; common. 
642. A. novce-anglice L. Along streams and roadsides; 
common. 
643. A. Icevis L. Dry, open ground; common. 
644. A. sericeus Vent. Dry, open ground; frequent. 
645. A. salicifolius Lam. Along streams; frequent. 
646. A. paniculatus hdi>m. Moist ground along streams; 
common. 
647. A. paniculatushellidiflorus (W Hid.) Burgess. With 
the type. 
648. A. lateriflorus (L.) Brit. {A. diffusus Ait.) Damp, 
shady or open ground; abundant. Numerous 
forms occur, probably representing several of 
the described varieties. 
649. A. multiflorus Ait. Dry, open ground; abundant. 
Erigeron. 
650. E . philadelphicus h. River banks; common. 
651. E. annuus (L.) Pers. Fields and open woods; 
abundant. 
