Flora of North America species comparison

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Callitriche trochlearis

Callitriche brutia

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

narrow-leaf water-starwort
Stem

and leaf scales present.

Leaves

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

Inflorescences

bracts persistent.

Pedicels

0–0.5 mm in fruit.

Flowers

usually 1 staminate and 1 pistillate in each axil;

styles spreading;

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.

2n

= 40.

Callitriche trochlearis

Callitriche brutia
Phenology Flowering Apr–Jul.
Habitat Vernal and perennial pools, ditches.
Elevation 0–2000 m. (0–6600 ft.)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
OR; WA; BC; Europe; Africa [Introduced to Australia]
[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.)

Varieties 2 (1 in the flora).

Variety brutia is known from Europe and Africa plus is introduced to Australia; it differs from var. hamulata in chromosome number (2n = 28) and pedicellate fruit.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 54. FNA vol. 17, p. 50.
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. fassettii, C. hermaphroditica, C. heterophylla, C. longipedunculata, C. marginata, C. palustris, C. pedunculosa, C. peploides, C. stagnalis, C. stenoptera, C. terrestris, C. trochlearis
Subordinate taxa
C. brutia var. hamulata
Name authority Fassett: Rhodora 53: 194. (1951) Petagna: Inst. Bot. 2: 10. (1787)
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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