United States, California, Marin, In wet, muddy ditch along Paradise Dr., near Upland Cir., ca. 1.4 mi. E of U. S. Hwy, 101 and a hundred or more ft. from San Fancisco Bay, Triburon Peninsula, Marin Co., Calif.
Associates were Typha latifolia, Scirpus robustus, and Cyperus Eragrostis.
Corolla White. Herbage light green, almost lusterless. Hgts. ca. 3-5 ft.