Flora of North America species comparison

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Callitriche trochlearis

Callitriche peploides

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

Matted 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, spatulate-obovate, 1.4–2.3 × 0.4–1.5 mm, 2+-veined.
Inflorescences

bracts persistent.

bracts absent.
Pedicels

0–0.5 mm in fruit.

0 mm in fruit.
Flowers

usually 1 staminate and 1 pistillate in each axil;

styles spreading;

pollen yellow.

not solitary, usually 1 staminate and 1 pistillate in 1 axil opposed by 1 pistillate;

styles erect to reflexed;

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.

0.4–0.7 × 0.7–0.9 mm, shorter than wide;

mericarps black, swollen at base, not winged or winged only at apex, wings straight, 0–0.03 mm wide.
2n

= 40.

= 10.

Callitriche trochlearis

Callitriche peploides
Phenology Flowering Apr–Jul. Flowering (Jan–)Feb–Apr(–May), Oct–Dec.
Habitat Vernal and perennial pools, ditches. Seasonally damp hollows, sandy soils in woodlands, gardens, waste grounds, rocky areas.
Elevation 0–2000 m. (0–6600 ft.) 0–100 m. (0–300 ft.)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; CA; FL; GA; LA; MS; TX [Introduced in Asia (China, Taiwan), Indian Ocean Islands (Madagascar, Réunion), Pacific Islands (New Zealand)]
[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.)

Three varieties of Callitriche peploides have been recognized (N. C. Fassett 1951b). A collection reported as a weed of a container in a nursery in San Bernardino County, California (T. C. Fuller 1967) is referable to var. semialata. The characters used to distinguish these varieties do not appear reliable, and it seems best to disregard them (R. V. Lansdown and M. J. M. Christenhusz 2011).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 54. FNA vol. 17, p. 53.
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. marginata, C. palustris, C. pedunculosa, C. stagnalis, C. stenoptera, C. terrestris, C. trochlearis
Synonyms C. peploides var. semialata
Name authority Fassett: Rhodora 53: 194. (1951) Nuttall: Trans. Amer. Philos. Soc., n. s. 5: 141. (1835)
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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