Monoecious; stems 3-9 dm, ca 1 mm thick; lvs 1-1.5 mm, spreading, minutely serrulate with 50-100 unicellular teeth per side; anthers monothecal and with a single microsporangium; seeds 3.3-3.8 mm, slender, fusiform-cylindric, with 50-60 rows of minute, rectangular areolae. Abundant on tidal mudflats along the Hudson R. (N. guadalupensis var. m.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.