IOWA ACADEMY OF SCIENCES. 
217 
Amelanchier. 
342. A. canadensis (L.) Medic. Common on high rocky 
river banks and in dry \voods. 
• 343. A. hotrijapium (L. f.) DC. {A. canadensis ohlongi- 
folia T. & G.) Apparently confined to the mar- 
gins of steep, rocky river banks, where it is 
common. 
344. A. rotiindifolia (Michx.) Roem. (A. canadensis ro- 
tundifolia T. & G.) With the preceding but 
infrequent. Though the species is of doubtful 
standing, it' appears to be quite distinct in our 
territory, showing no sign of intergrading with 
the typical A. canadensis. 
Cratjsgus. 
345. C. crns-galli L. Frequent in open woods. 
^ 346. C. coccinea L. Common in woods. 
347. C. macracaniha Lodd. (( 7 . coccinea macracantha 
Dud.) Frequent in woods. 
348. C. mollis (T. & G.) Schule. (C. coccinea mollis T. 
& G.) Abundant in open woods. 
DRUPACE^. 
Prunes. 
349. P. americana Marsh. Common in woods and along 
roads. 
350. P. pennsghanica L. f. Dry open woods and thickets; 
frequent. 
351. P. virginiana\j. Common in dry woods. 
352. P. serotina^hrh.. Frequent about the borders of 
woods and along roads. 
C^SALPINACE^. 
Cassia. 
353. C. charncecrista L. Dry, sandy soil; common. 
Gleditsia. 
354. G. triacanthos h. Woods; infrequent. 
Gymnocladus. 
355. G. dioica (L.) Koch. (G. canadensis Lam.) Deep 
woods; infrequent. 
