Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
43. Callitrichaceae, the Water Starwort Family
1. Callitriche L. -- Water starwort
3. Callitriche verna L.
Submersed or occasionally amphibious aquatic, sometimes growing on mud, with
stems 0.5-2 dm long. Leaves typically of 2 types; submersed leaves
mostly linear, 5-20 mm long, 0.3-1 mm wide, shallowly bidentate at the tip,
clasping at the base with a ridge or narrow, membranous wing connecting the
leaf bases; floating leaves seldom absent, mostly in terminal rosettes,
obovate to oblanceolate or spatulate, 3-10 mm long, 1.5-5 mm wide, 3- to 5-nerved,
rounded at the tip, tapered to a flat petiole and connected by a ridge at their
bases; leaves transitional between the submersed and floating leaves usually
present. Flowers subtended by a pair of hyaline bracts, these soon deciduous.
Fruits higher than wide, 0.8-1.7 mm long, 0.6-1.4 mm wide, narrowly wing-margined
at least toward the summit, pitted in longitudinal rows. Jun--Sep. In the same
habitats as C. hermaphroditica, sometimes stranded and persisting on
mud; occasional in ND, e and the Black Hills in SD, rare in c NE; (Circumboreal,
in N.Amer. s to WV, OH, IL, IA, KS, NM and CA). C. palustris L.
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