Callitriche pedunculosa
Callitriche peploides
Nuttall's water-starwort
Matted water-starwort
and leaf scales present.
and leaf scales present.
connate at base, obovate-oblanceolate to spatulate, (2.2–)2.7–5.7 × 0.7–2 mm, 2+-veined.
connate at base, spatulate-obovate, 1.4–2.3 × 0.4–1.5 mm, 2+-veined.
bracts absent.
bracts absent.
0–5 mm in fruit.
0 mm in fruit.
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.
not solitary, usually 1 staminate and 1 pistillate in 1 axil opposed by 1 pistillate;
styles erect to reflexed;
pollen yellow.
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.
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.
= 20.
= 10.
Callitriche pedunculosa
Callitriche peploides
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.)
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.)
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