Callitriche palustris

Linnaeus
Sp. Pl. 2: 969. 1753.
Common names: Vernal water-starwort callitriche des marais
Synonyms: Callitriche palustris var. stenocarpa (Hegelmaier) Jepson C. palustris var. verna (Linnaeus) Fenley e× Jepson C. stenocarpa Hegelmaier C. verna Linnaeus
Treatment appears in FNA Volume 17. Treatment on page 53. Mentioned on page 49, 50.

Leaves connate at base, ± linear, tapering strongly from near base or spatulate, 2.5–9 × 0.3–5 mm, 1+-veined. Stem and leaf scales present. Inflorescences: bracts caducous, sometimes persistent. Pedicels 0–0.2 mm in fruit. Flowers usually 1 staminate and 1 pistillate in 1 axil opposed by 1 pistillate; styles erect or spreading; pollen yellow. Schizocarps obovoid, usually widest distal to middle, 0.8–1.4 × 0.6–1.4 mm, longer than wide, sometimes as long as wide; mericarps black, not swollen, not winged, winged only at apex, or winged throughout but widest at apex, wings straight, 0.03–0.1 mm wide. 2n = 20.


Phenology: Flowering May–Oct.
Habitat: Fast-flowing rivers and streams, backwaters, ditches, swamps, Sphagnum bogs, lakes, ponds, springs, seepages.
Elevation: 0–3600 m.

Distribution

Greenland, St. Pierre and Miquelon, Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.W.T., Nunavut, Ont., P.E.I., Que., Sask., Yukon, Alaska, Ariz., Calif., Colo., Conn., Del., Idaho, Ill., Iowa, Maine, Mass., Mich., Minn., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.Dak., Oreg., Pa., R.I., S.Dak., Tex., Utah, Vt., Wash., Wis., Wyo., Mexico (Chihuahua, San Luis Potosí), Eurasia, introduced in Australia.

Discussion

Callitriche palustris has been included on the Composite List of Weeds maintained by the Weed Science Society of America (http://wssa.net/wssa/weed/composite-list-of-weeds/); its inclusion seems unwarranted.

Selected References

None.

Lower Taxa

None.

... more about "Callitriche palustris"
Richard V. Lansdown +
Linnaeus +
Vernal water-starwort +  and callitriche des marais +
Greenland +, St. Pierre and Miquelon +, Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.W.T. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Ariz. +, Calif. +, Colo. +, Conn. +, Del. +, Idaho +, Ill. +, Iowa +, Maine +, Mass. +, Mich. +, Minn. +, Mont. +, Nebr. +, Nev. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.Dak. +, Oreg. +, Pa. +, R.I. +, S.Dak. +, Tex. +, Utah +, Vt. +, Wash. +, Wis. +, Wyo. +, Mexico (Chihuahua +, San Luis Potosí) +, Eurasia +  and introduced in Australia. +
0–3600 m. +
Fast-flowing rivers and streams, backwaters, ditches, swamps, Sphagnum bogs, lakes, ponds, springs, seepages. +
Flowering May–Oct. +
Callitriche palustris var. stenocarpa +, C. palustris var. verna +, C. stenocarpa +  and C. verna +
Callitriche palustris +
Callitriche +
species +