Flora of North America species comparison

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Callitriche trochlearis

Callitriche marginata

effluent water-starwort, water starwort, wheel fruit water-starwort

wing water-starwort
Stem

and leaf scales present.

and leaf scales present.
Leaves

connate at base, ± parallel-sided, 5.2–9.1 × 0.1–0.9 mm, 1+-veined.

connate at base, narrowly spatulate, 3.5–7.1(–7.2) × 0.7–1.4 mm, 1+-veined.
Inflorescences

bracts persistent.

bracts absent.
Pedicels

0–0.5 mm in fruit.

1.2–3.3 mm in fruit.
Flowers

usually 1 staminate and 1 pistillate in each axil;

styles spreading;

pollen yellow.

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

1–1.2 × 1.1–1.3 mm, ± as long as wide;

mericarps black, not swollen, evenly winged throughout, wings straight, 0.05–0.1 mm wide.

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

= 40.

= 20.

Callitriche trochlearis

Callitriche marginata
Phenology Flowering Apr–Jul. Flowering Apr–Aug.
Habitat Vernal and perennial pools, ditches. Lakes, reservoirs, floodplain pools, streams, vernal pools.
Elevation 0–2000 m. (0–6600 ft.) 0–1000 m. (0–3300 ft.)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR; BC; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
Discussion

Callitriche trochlearis occurs in northwestern and central-western California plus western Oregon.

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

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).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 54. FNA vol. 17, p. 52.
Parent taxa Plantaginaceae > Callitriche Plantaginaceae > Callitriche
Sibling taxa
C. brutia, C. fassettii, C. hermaphroditica, C. heterophylla, C. longipedunculata, C. marginata, C. palustris, C. pedunculosa, C. peploides, C. stagnalis, C. stenoptera, C. terrestris
C. brutia, C. fassettii, C. hermaphroditica, C. heterophylla, C. longipedunculata, C. palustris, C. pedunculosa, C. peploides, C. stagnalis, C. stenoptera, C. terrestris, C. trochlearis
Synonyms C. sepulta
Name authority Fassett: Rhodora 53: 194. (1951) Torrey: in War Department [U.S.], Pacif. Railr. Rep. 4(5): 135. (1857)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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