This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Small annual aquatic submerged herbs, with basal linear subulate leaves, and minute racemose white flowers. Silicles short-stipitate, globose to oblong or elliptic, the valves convex, I-ribbed on the back, the partition broad. Stigma sessile, entire. Seeds few, in 2 rows in each cell, marginless. Cotyledons narrow, incumbent, curved above their base. [Latin awl, from the awl-shaped leaves.]
A monotypic genus of the northern hemisphere.
Subularia aquatica L. Sp. Pl. 642. 1753.
Tufted, glabrous, 1'-4' high, growing on the margins and bottoms of lakes in shallow water. Flowering scape simple, lateral, 1'-3 1/2' high; leaves nearly cylindric, 6"-15" long; flowers few, racemose, distant; pedicels slender, 1"-3" long in fruit; petals white, minute; pods 1"-1 1/2" long.