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callitriche des marais, spring water-starwort, vernal water-starwort


and leaf scales present.


connate at base, ± linear, tapering strongly from near base or spatulate, 2.5–9 × 0.3–5 mm, 1+-veined.


bracts caducous, sometimes persistent.


0–0.2 mm in fruit.


usually 1 staminate and 1 pistillate in 1 axil opposed by 1 pistillate;

styles erect or spreading;

pollen yellow.


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.


= 20.

Callitriche palustris

Phenology Flowering May–Oct.
Habitat Fast-flowing rivers and streams, backwaters, ditches, swamps, Sphagnum bogs, lakes, ponds, springs, seepages.
Elevation 0–3600 m. (0–11800 ft.)
from FNA
AK; AZ; CA; CO; CT; DE; IA; ID; IL; MA; ME; MI; MN; MT; ND; NE; NH; NJ; NM; NV; NY; OR; PA; RI; SD; TX; UT; VT; WA; WI; WY; AB; BC; MB; NB; NF; NT; NU; ON; PE; QC; SK; YT; SPM; Greenland; Mexico (Chihuahua, San Luis Potosí); Eurasia [Introduced in Australia]
[WildflowerSearch map]
[BONAP county map]

Callitriche palustris has been included on the Composite List of Weeds maintained by the Weed Science Society of America (; its inclusion seems unwarranted.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 17, p. 53.
Parent taxa Plantaginaceae > Callitriche
Sibling taxa
C. brutia, C. fassettii, C. hermaphroditica, C. heterophylla, C. longipedunculata, C. marginata, C. pedunculosa, C. peploides, C. stagnalis, C. stenoptera, C. terrestris, C. trochlearis
Synonyms C. palustris var. stenocarpa, C. palustris var. verna, C. stenocarpa, C. verna
Name authority Linnaeus: Sp. Pl. 2: 969. (1753)
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