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IOWA ACADEMY OF SCIENCE 
631. Viola sagittal a Ait. Arrow-leaved Violet. With the above but 
less common. 
632. Viola pedatifida G. Don. Prairie Cut-leaved Violet. Common on 
dry soils in open places. 
633. Viola pubescens Ait. Downy Yellow Violet. Abundant in moist 
woodlands. 
LYTHRACEAE. 
AMMANNIA (Houst) L. 
634. Ammannia coccinea Rothb. Long-leaved Ammannia. Common 
in sandy soils. 
LYTHRUM L. 
635. Lythrum alatum Pursh. Wing-angled Loosestrife. Common in 
marshes. 
MELASTOMACEAE. 
RHEXIA L. 
636. Rhexia virginica L, Meadow Beauty, Deer Grass. Rare ; Oxford. 
In a marshy meadow. 
ONAGRACEAE. 
LUDVIGIA L. 
637. Ludvigia alternifolia L. Seed Box or Rattle Box. Common in 
marshy places. 
638. Ludvigia polycarpa Short & Peter. Many-fruited Ludvigia. Com- 
mon in marshes. 
639. Ludvigia palustris (L.) Ell. Water Purslane. Scarce and local; 
Oxford, Elmira. 
EPILOBIUM L. 
640. Epilobium angustifolium L. Great Willow-herb or Eireweed. 
Rather scarce in thin woods and along streams. 
641. Epilobium color aium Muhl. Purple-leaved Willow-herb. Com- 
mon in marshy places. 
