Flora of North America species comparison

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Callitriche fassettii

Callitriche marginata

autumnal water-starwort, Fassett's water-starwort

wing water-starwort
Stem

and leaf scales absent.

and leaf scales present.
Leaves

not connate at base, ± linear, tapering from base, 12 × 0.3–0.5 mm, 1-veined.

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

bracts absent.

bracts absent.
Pedicels

0.5–1 mm in fruit.

1.2–3.3 mm in fruit.
Flowers

solitary or 1+ per axil;

styles recurved, ± reflexed;

pollen colorless.

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

1.1–1.8 × 1.5–2.5 mm, shorter than wide;

mericarps black, not swollen, winged throughout, wings straight, 0.1–0.3 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

= 20.

Callitriche fassettii

Callitriche marginata
Phenology Flowering Apr–May(–Jul). Flowering Apr–Aug.
Habitat Vernal and permanent pools, running water. Lakes, reservoirs, floodplain pools, streams, vernal pools.
Elevation 0–1600 m. (0–5200 ft.) 0–1000 m. (0–3300 ft.)
Distribution
from FNA
CA; NE; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR; BC; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
Discussion

Callitriche fassettii is widespread in California and adjacent Oregon. The record from Nebraska is based on a single specimen, which could be due to introduction, or could involve an identification or recording error and requires confirmation.

(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. 51. FNA vol. 17, p. 52.
Parent taxa Plantaginaceae > Callitriche Plantaginaceae > Callitriche
Sibling taxa
C. brutia, C. hermaphroditica, C. heterophylla, C. longipedunculata, C. marginata, C. palustris, C. pedunculosa, C. peploides, C. stagnalis, C. stenoptera, C. terrestris, C. trochlearis
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. autumnalis var. bicarpellaris, C. hermaphroditica var. bicarpellaris C. sepulta
Name authority Schotsman: Acta Bot. Neerl. 15: 477, figs. 1, 2. (1966) 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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