Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
Callitriche L. -- Water Starwort
Rather small and delicate, perennial aquatics with weak, filiform, leafy stems
and fibrous roots, seldom growing on mud. Leaves small, all submersed
or the upper ones floating, simple, opposite; submersed leaves sessile,
clasping or connate by a narrow ridge or wing, linear, 1-nerved, entire except
for the shallowly bidentate apex; floating leaves, when present, clustered
in terminal rosettes or partly in separate pairs, obovate to oblanceolate or
spatulate, 3- to 5-nerved, rounded, tapered at the base to a flat petiole. Flowers
minute, inconspicuous, sessile and solitary in middle and upper leaf axils,
naked or subtended by a pair of hyaline bracts, usually imperfect (the plants
polygamo-monoecious), each consisting of 1 stamen or 1 pistil or both; pistil
2-carpellary, styles 2, deciduous, ovary flattened, oval to orbicular, 4-celled,
furrowed down the middle of each face and partitioned from each edge toward
the middle, separating at maturity into 4 flattened, 1-seeded nutlets.
Fassett, N. C. 1951. Callitriche in the New World.
Rhodora 53:137-155, 161-182, 185-194, 209-222.
||Plants with linear submersed leaves only, these
clasping, not connected at their bases; flowers not subtended by a pair
of hyaline bracts.
||Plants often with some obovate to spatulate floating
leaves; submersed leaves connected at their bases by a ridge or narrow
wing; flowers subtended by a pair of hyaline bracts.
||Fruit longer than broad, its segments narrowly wing-margined
at least toward the summit, pitted in rows.
||Fruit about as broad as long, its segments rounded
on the back, not wing-margined, irregularly pitted.
43. Callitrichaceae, the Water Starwort Family
1. Callitriche L. -- Water starwort
- 1. Callitriche hermphroditica L.
- 2. Callitriche heterophylla Pursh
- 3. Callitriche verna L.
Return to Family -- Callitrichaceae - The Water
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