IOWA ACADEMY OF SCIENCES. 237 



CiCUTA L. 



4U7. C. mciculafa L. Water Hemlock. Common in low 

 ground; the tuberous roots are very poisonous. 



408. C. hulhifera h. Rare in marshes. This plant bears 



numerous clusters of bulblets in the leaf axils. 



CORNACE^li. 

 CORNUS L. 



409. C. ciirinata L'Her. Round-leaved Dogwood. Rare 



on shaded banks. 



410. C. asjjcri/o/ia Michx. Infrequent. 



411. C. stolonifcra Michx. Frequent in low woods and 



on river banks. 

 422. C. caudidiss'una Marsh. (C panicn/ata L'Her.) 



Panicled Dogwood. Our commonest species. 

 418. C. alfeniifolia L. f. Alternate-leaved Dogwood. 



Rare; woods southwest of Armstrong. 



PRIMULACE^. 



Steironema Raf. Loosestrife. 



414. S. ciliatuiH (L.) Raf. [Li/siniacliia ciliafa L.) Woods 



and prairies; common. 



415. S. lanceolafnm (Walt.) A. Gray. {Li/simachia 



lauceolata Walt.) Rare; in low ground; some- 

 times growing in water. 



416. S. qiiadrifiorKni (Sims.) Hitch. {Li/sitnachia lonyi- 



folia Pursh; Ste'ironewa lo)i(j\follH)n A. (iray.) 

 Very common on low prairies. 



Naumburgia Ma?nch. 



417. A^ thiirsifiora (L.) Duby. {Lysimachia t/ii/rsi flora L.) 



Tufted Loosestrife. Common in marshes. 



OLEACE^. 



Fraxinus L. 



418. /''. americaua L. White Ash. Very common in 



low woods, and along streams. 



