IOWA ACADEMY OF SCIENCES. 247 



Lacinaria Hill. Blazing Star. Button Snakeroot. 



531. L. pundafa (Hook.) Kiuitze. {Liatris punctata 

 Hook.) Frequent on dry gravelly knolls. 



582. Tj. j)i/fHosf(icIti/(( (Michx.) Kuntze. {Liatris 

 plicnodacluja Michx.) Very common on low 

 prairies; rarely pure white flowers are seen. 



533. L. scariom (L.) Hill. (.Liatris scariosa Willd.) 



Common. The heads are usually sessile, but in 

 wet years they are frequently on peduncles an 

 inch or more in length, a form called var. 

 racemulosa Sheldon. 



Solid AGO L. olden-rod. 



534. N. Jlcxiraidis L. {S. hitifolia L.) Frequent in 



w^oods. 

 585. S. rigidiusciila (Torr. and Gray.) Porter. {S. speciosa 

 vav. auf/ustata A. Gray.) Rare on dry prairies, 

 growing in clumps. 



536. S. serotina Ait. Frequent, especially near timber; 



our tallest species. 



537. S. missouriensis Nutt. Very common on prairies; 



our earliest species in flower. 



538. S. canadensis L. Very common and variable. 



539. S. nenioralis Ait. Common on dry prairies and 



gravelly knolls. 



540. S. /-/(/Ida L. Very common. 



541. S. riddel Hi Frank. Rare on low prairies. The 



peculiar, grass-like leaves at once distinguish 

 this beautiful species. 



EUTHAMIA Nutt. 



542. E. (/ranunifolia (L.) Nutt. (Solidago lanceolata L.) 



Frequent in low prairies. 



BoLTONiA L'Her. 



543. B. asteroidcs (L.) L'Her. Very common';on low 



prairies, often growing in water. 



Aster L. Aster. 



544. .1. cordifoJinsh. Frequent in woods. 



