Tidal arrowhead

Sagittaria calycina Engelmann var. spongiosa Engelmann in A. Gray, Manual ed. 5, 493. 1867; Lophotocarpus spongiosus (Engelmann) J. G. Smith; Sagittaria spatulata (J. G. Smith) Buchenau

Herbs, annual, often stranded by low tide. Leaves emersed, sessile, phyllodial, lanceolate, or petiolate with blade spatulate, rarely sagittate. Inflorescences of 1--4 whorls, emersed; bracts connate. Flowers: pistillate with ring of sterile stamens; petals without purple spot at base. 2n = 22.

Flowering summer--fall (Jul--Oct). Brackish to freshwater tidal mud flats and salt marshes; 0--5 m; N.B.; Conn., Del., Maine, Md., Mass., N.H., N.J., N.Y., Pa.