238 DAVENPORT ACADEMY OP' SCIENCES. 



499. A. cannabinum, L. 



Moist or dry soil ; frequent. 



ASCLEPIADACEiE. 



Asclepias, L. Milkweed. Silkweed. 



500. A. tuberosa, L. Butterfly- weed. Pleurisy-root. 

 Dry prairies ; common. 



501. A purpurascens,]-.. 



Along railroads : not common. Dry hillside near Wild Cat 

 Den. 



502. A. incarnata, L. 



Low wet grounds ; common. 



503. A. Cornuti, Decaisne. 



Fields and waste places ; common. 



504. A. Sullivantii, Engelm. 



Prairies : infrequent. 



505. A. obtusifolia, Michx. 

 Sandy soil ; frequent. 



506. A. phytolaccoides, Puish. 



Moist woods of Muscatine count) ; not rare. 



507. A. quadrifolia, L. 



Dry woods ; rare. Wild Cat Den, Weed's Woods, and T'w'p. 

 Seventy-six of Muscatine county. 



508. A. vcrticillata, L. 



Dry prairies ; common. 

 Acerates, Ell. Green Milkweed. 



509. A. longifolia, Ell. 



Prairies and roadsides; common. 



510. A. viridiflora, Ell. 



Dry prairies; common. 



GENTIANACE^E. 



Gentiana, Tourn. Gentian. 



511. G. crinita, Froel. 



Boggy ravine, Lake T'w'p., and Cedar River region in Mus- 

 catine county. 



