Justicia americana
A smooth 1-3' plant with pairs of sessile, lance-shaped, willow-like leaves. The flowers are in small clusters at the top of the stem and are white or pale violet, spotted with purple. The corolla is 2-lipped. The lower lip is deeply 3-lobed and the lobes are spreading. The upper lip is wider, notched and arches over the lower. There are 2 stamens and 5 narrow, green sepals. Blooms June-October in shallow water at the margins of ponds, lakes, streams. Often seen in large colonies.