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

terrestrial water-starwort

Stem

and leaf scales present.

and leaf scales present.

Leaves

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

connate at base, obovate-oblanceolate to spatulate, 1.5–3.9 × 0.8–1.4(–1.5) mm, 2+-veined.

Inflorescences

bracts caducous, sometimes persistent.

bracts absent.

Pedicels

0–0.2 mm in fruit.

0.4–0.6 mm in fruit.

Flowers

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

styles erect or spreading;

pollen yellow.

usually solitary or 1 staminate and 1 pistillate opposed by 1 pistillate;

styles deflexed;

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.

(0.5–)0.6–0.7(–0.8) × (0.5–)0.8–1 mm, shorter than wide;

mericarps black, not swollen, winged only at apex, wings straight, 0.01–0.03 mm wide.

2n

= 20.

= 10.

Callitriche palustris

Callitriche terrestris

Phenology Flowering May–Oct. Flowering Apr–Jul(–Aug), Nov–Dec.
Habitat Fast-flowing rivers and streams, backwaters, ditches, swamps, Sphagnum bogs, lakes, ponds, springs, seepages. Seasonally wet hollows, damp soils, cultivated fields, rocky grounds, paths, tracks, sandy bars.
Elevation 0–3600 m. (0–11800 ft.) 0–600 m. (0–2000 ft.)
Distribution
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]
from FNA
AR; CT; DC; IL; IN; KS; KY; LA; MA; MO; MS; NC; ND; NY; OH; PA; TN; TX; VA; NB; Mexico; Central America; South America [Introduced in Asia (China, Japan)]
[WildflowerSearch map]
[BONAP county map]
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.

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

Source FNA vol. 17, p. 53. FNA vol. 17, p. 54.
Parent taxa Plantaginaceae > Callitriche 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
C. brutia, C. fassettii, C. hermaphroditica, C. heterophylla, C. longipedunculata, C. marginata, C. palustris, C. pedunculosa, C. peploides, C. stagnalis, C. stenoptera, C. trochlearis
Synonyms C. palustris var. stenocarpa, C. palustris var. verna, C. stenocarpa, C. verna
Name authority Linnaeus: Sp. Pl. 2: 969. (1753) Rafinesque: Med. Repos., hexade 2, 5: 358. (1808) — (as terrestre)
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