Myosoton aquaticum (L.) Moench
Family: Caryophyllaceae
giant chickweed, water chickweed
[Alsine aquatica (L.) Britton,  more...]
Myosoton aquaticum image
Robert W. Freckmann  
Myosoton aquaticum image
Myosoton aquaticum image
University of Wisconsin - Madison (WIS-VP)  
Etymology: Myosoton: from mys for "mouse" and ous for "ear," referring to the leaves
Plants: prostrate with erect tips, perennial, 2"-24" tall, branched forb; stems glandular-hairy; rhizomes rooting from lower nodes
Leaves: opposite, mostly stalkless except lower leaves on short stalks
Flowers: white, 5-parted, 1/4"-1/2" wide, stalked, usually with 5 styles, deeply lobed petals much longer than the sepals; inflorescence open, leafy, terminal, branched cluster (cyme); blooms May-Oct.
Fruits: oval to oblong capsule
Habitat: moist; disturbed sites, woods
Conservation Status: Introduced - naturalized