Flora of North America species comparison

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Callitriche pedunculosa

Nuttall's water-starwort
Stem

and leaf scales present.
Leaves

connate at base, obovate-oblanceolate to spatulate, (2.2–)2.7–5.7 × 0.7–2 mm, 2+-veined.
Inflorescences

bracts absent.
Pedicels

0–5 mm in fruit.
Flowers

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

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

= 20.

Callitriche pedunculosa
Phenology Flowering Feb–Jun(Sep–Oct).
Habitat Seasonally wet sandy soils, in or shaded by woodlands.
Elevation 0–100 m. (0–300 ft.)
Distribution
from FNA
AL; LA; MS; TX
[BONAP county map]
Discussion

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. 53.
Parent taxa Plantaginaceae > Callitriche
Sibling taxa
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 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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