Flora of North America species comparison

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Callitriche trochlearis

Callitriche pedunculosa

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

Nuttall's 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, obovate-oblanceolate to spatulate, (2.2–)2.7–5.7 × 0.7–2 mm, 2+-veined.
Inflorescences

bracts persistent.

bracts absent.
Pedicels

0–0.5 mm in fruit.

0–5 mm in fruit.
Flowers

usually 1 staminate and 1 pistillate in each axil;

styles spreading;

pollen yellow.

usually 1 staminate and 1 pistillate in 1 axil opposed by 1 pistillate, rarely both pairs at an axil with 1 staminate and 1 pistillate;

styles loosely ascending or ± 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.

0.8–1 × 0.9–1.3 mm, shorter than wide;

mericarps black, not swollen, winged throughout, wings curled, giving appearance of thickened margins, 0.06–0.15 mm wide.
2n

= 40.

= 20.

Callitriche trochlearis

Callitriche pedunculosa
Phenology Flowering Apr–Jul. Flowering Feb–Jun(Sep–Oct).
Habitat Vernal and perennial pools, ditches. Seasonally wet sandy soils, in or shaded by woodlands.
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; LA; MS; TX
[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 nuttallii Torrey is an illegitimate, superfluous name that applies here. Torrey proposed it as a replacement for C. pedunculosa Nuttall based on the mistaken belief that the name by Nuttall was a later homonym of one by Arnott; the purported name by Arnott does not exist.

(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. peploides, C. stagnalis, C. stenoptera, C. terrestris, C. trochlearis
Name authority Fassett: Rhodora 53: 194. (1951) Nuttall: Trans. Amer. Philos. Soc., n. s. 5: 140. (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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