Sagittaria platyphylla
delta 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.
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.
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.
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.
= 22.
Sagittaria platyphylla
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.)
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