Flora of North America species comparison

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Sagittaria secundifolia

little river arrowhead
Habit Herbs, perennial, to 50 cm; rhizomes coarse; stolons absent; corms absent.
Leaves

mostly submersed, rarely emersed, sessile, phyllodial, flattened to lenticular, 5–30 × 0.2–0.5 cm.
Inflorescences

racemes, of 2–5 whorls, emersed, 1.5–8 × 1–7 cm;

peduncles 1–2.5 cm;

bracts connate more than or equal to ¼ total length, lanceolate, 0.5–1.5 mm, delicate, not papillose; fruiting pedicels spreading, cylindric, 0.6–2.5 cm.
Flowers

to 2.5 cm diam.;

sepals recurved to spreading, not enclosing flower or fruiting head;

filaments dilated, shorter than anthers, minutely tomentose;

pistillate pedicellate, without ring of sterile stamens.
Fruiting

heads 0.5 cm diam;

achenes obovoid-triangular, abaxially keeled, 2 × 1 mm, beaked;

faces tuberculate, wings 1, scalloped or toothed, glands 0–1;

beak lateral, incurved-erect, 0.3 mm.

Sagittaria secundifolia
Phenology Flowering spring–fall.
Habitat Riverine shoals and pools
Elevation 300–400 m (1000–1300 ft)
Distribution
from FNA
AL
[BONAP county map]
Discussion

The rhizomes of Sagittaria secundifolia grow in crevices of bedrock along the Little River in Alabama. During lower water periods, the plant flowers, with peduncles reaching the water surface, and flowers more or less floating on the water.

Of conservation concern.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 22.
Parent taxa Alismataceae > Sagittaria
Sibling taxa
S. ambigua, S. australis, S. brevirostra, S. cristata, S. cuneata, S. demersa, S. engelmanniana, S. fasciculata, S. filiformis, S. graminea, S. guayanensis, S. isoetiformis, S. kurziana, S. lancifolia, S. latifolia, S. longiloba, S. montevidensis, S. papillosa, S. platyphylla, S. rigida, S. sanfordii, S. subulata, S. teres
Name authority Kral: Brittonia 34: 12, fig.1. (1982)
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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