Sagittaria platyphylla
Sagittaria secundifolia
delta arrowhead
little river arrowhead
submersed and emersed; submersed sessile, phyllodial, flattened, to 26 × 0.5 cm; emersed with petiole ± triangular, 21–70.5 cm, blade linear-ovate to ovate, 4.6–16.4 × 0.7–6.1 cm.
mostly submersed, rarely emersed, sessile, phyllodial, flattened to lenticular, 5–30 × 0.2–0.5 cm.
racemes, of 3–9 whorls, emersed, 2.5–10 × 2–4.5 cm;
peduncles 22–60 cm;
bracts connate more than ¼ total length, lanceolate, 3–5.5 mm, delicate, not papillose; fruiting pedicels spreading to recurved, cylindric, 0.5–3 cm.
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.
to 1.8 cm diam.;
sepals spreading to recurved, not enclosing flower or fruiting head;
filaments dilated, longer than anthers, pubescent;
pistillate pedicellate, without ring of sterile stamens.
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.
heads 0.7–1.2 cm diam.;
achenes oblanceoloid, not abaxially keeled, 1.2–2 × 0.8–1.2 mm, beaked;
faces tuberculate, wings absent, glands absent;
beak lateral, horizontal to erect, 0.3–0.6 mm.
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.
= 22.
Sagittaria platyphylla
Sagittaria secundifolia
Sagittaria platyphylla has been accepted at the variety level, i.e., Sagittaria graminea var. platyphylla (C. Bogin 1955; J. W. Wooten 1973; E. O. Beal et al. 1982). After studying dozens of populations in the field from much of its range and hundreds of herbarium specimens, we have concluded that this taxon should be recognized at the specific level instead, a conclusion supported by cladistic analyses of morphologic characters (R. M. Kortright 1998)
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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