Callitriche pedunculosa
Callitriche stenoptera
Nuttall's water-starwort
narrow-wing water-starwort
and leaf scales present.
and leaf scales absent.
connate at base, obovate-oblanceolate to spatulate, (2.2–)2.7–5.7 × 0.7–2 mm, 2+-veined.
not connate at base, ± linear tapering from base, 5.9–11.3 × 0.3–1.1 mm, 1-veined.
bracts absent.
bracts absent.
0–5 mm in fruit.
0–0.2 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.
usually solitary or 1 pistillate and 1 staminate in an axil;
styles reflexed or strongly curved;
pollen colorless.
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.
0.8–1.2 × 0.9–1.3 mm, as long as or shorter than wide;
mericarps brown or gray-brown, not swollen, winged throughout, wings straight, 0.05–0.1 mm wide, width less than mericarp body.
= 20.
Callitriche pedunculosa
Callitriche stenoptera
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.)
Callitriche stenoptera most closely resembles C. fassettii and C. hermaphroditica but is distinguished from them by the fruit on which the wing is less than 0.1 mm wide, even at the fruit apex.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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