Flora of North America species comparison

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Callitriche pedunculosa

Callitriche brutia

Nuttall's water-starwort

narrow-leaf 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

Callitriche brutia
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]
from FNA
OR; WA; BC; Europe; Africa [Introduced to Australia]
[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.)

Varieties 2 (1 in the flora).

Variety brutia is known from Europe and Africa plus is introduced to Australia; it differs from var. hamulata in chromosome number (2n = 28) and pedicellate fruit.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 53. FNA vol. 17, p. 50.
Parent taxa Plantaginaceae > Callitriche 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
C. fassettii, C. hermaphroditica, C. heterophylla, C. longipedunculata, C. marginata, C. palustris, C. pedunculosa, C. peploides, C. stagnalis, C. stenoptera, C. terrestris, C. trochlearis
Subordinate taxa
C. brutia var. hamulata
Name authority Nuttall: Trans. Amer. Philos. Soc., n. s. 5: 140. (1835) Petagna: Inst. Bot. 2: 10. (1787)
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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