IOWA ACADEMY OF SCIENCES. 
223 
HYPEKICACEJE. 
Hypericum, 
429. IL ascyran L. Banks of streams; scarce. 
4B0, R. sphcerocarpum Wvohx, Dry ground; infrequent. 
431. H, canadense L. Wet ground; infrequent. 
432. H, mutihm L. Wet, sandy ground; infrequent. 
CIS TAG E^. 
Helianthemum. 
433. R. canadense (L.) Michx. Dry, sandy ground; com- 
mon. 
Lechea. 
434. L. villosa L. (L. major Michx.) With the pre- 
ceding; common. 
VIOLACE^ 
Viola. 
435. V. palmata L. Open woods; infrequent. 
436. V. pedatifida Don. Meadows and thickets; com- 
mon. 
437. V. obliqua Hill. (F. palmata cucullata Gray.) 
Abundant in woods and meadows. 
438. V. pedata L. Dry prairies; common. 
439. V. pwhescens Ait. Abundant in moist woods. 
LYTHRACE^. 
Lythrum. 
440. L. alatum Pursh. Abundant in wet ground. 
ONOGRACE^. 
Ludwigia. 
441. L. polycarpa Short & Peter. Frequent in swampy 
ground. 
Epilobium . 
442. E. lineare Muhl. Swampy ground; frequent 
443. E . coloratwm Muhl . Swampy ground and along 
streams; abundant. 
444. E . adenocaulon Huussk . Wet ground; rare . 
