Leaves connate at base, narrowly spatulate, 3.5–7.1(–7.2) × 0.7–1.4 mm, 1+-veined. Stem and leaf scales present. Inflorescences: bracts absent. Pedicels 1.2–3.3 mm in fruit. Flowers usually 1 pistillate and 1 staminate in each axil, sometimes 1 or 2 axils with 2 pistillate, rarely solitary; styles sharply deflexed; pollen yellow. Schizocarps 0.7–0.9 × 1.1–1.4 mm, shorter than wide; mericarps maroon or white, not swollen, winged throughout, wings straight, 0.1–0.2 mm wide. 2n = 20.

Phenology: Flowering Apr–Aug.
Habitat: Lakes, reservoirs, floodplain pools, streams, vernal pools.
Elevation: 0–1000 m.

Distribution

• Generated Map
• Legacy Map

B.C., Calif., Oreg., Mexico (Baja California).

Discussion

Callitriche marginata is known throughout the California floristic province northward to southeastern British Columbia. There are no records from Washington State and British Columbia; occurrences may be remnants of a previously more widespread population (M. Miller 2001).

Selected References

Miller, M. 2001. Stewardship Account for Winged Water Starwort Callitriche marginata. Prepared for the B.C. Conservation Data Centre and the Garry Oak Ecosystems Recovery Team. Victoria.

Lower Taxa

None.