IOWA ACADEMY OF SCIENCES. 
237 
ClCUTA L. 
407. G . maculata L. Water Hemlock. Common in low 
ground; the tuberous roots are very poisonous. 
408. C.bulbifera L. Hare in marshes. This plant bears 
numerous clusters of bulblets in the leaf axils. 
CORNACE^E. 
Cornus L. 
409. C. circinata L’Her. Round-leaved Dogwood. Rare 
on shaded banks. 
410. C. asperifolia Michx. Infrequent. 
411. C. stolonifera Michx. Frequent in low woods and 
on river banks. 
422. G. candidissima Marsh. ( C . paniculata L’Her.) 
Panicled Dogwood. Our commonest species. 
413. C. alternifolia L. f. Alternate-leaved Dogwood. 
Rare; woods southwest of Armstrong. 
PRIMULACE^E. 
Steironema Raf. Loosestrife. 
414. S. ciliatum (L.) Raf. (Lysimachia ciliata L.) Woods 
and prairies; common. 
415. S. lanceolatum (Walt.) A. Gray. ( Lysimachia 
lanceolctta Walt.) Rare; in low ground; some- 
times growing in water. 
416. S\ quadriflorum (Sims.) Hitch. ( Lysimachia longi- 
folia Pursh; Steironewa longifolium A. Gray.) 
Very common on low prairies. 
Naumburgia Moench. 
417. A T . thyrsiflora (L.) Duby. ( Lysimachia thyrsiflora L.) 
Tufted Loosestrife. Common in marshes. 
OLEACEEE. 
Fraxinus L. 
418. F. americana L. White Ash. Very common in 
low woods, and along streams. 
