Sagittaria cuneata
Sagittaria platyphylla
arum-leaf arrowhead, northern arrowhead, sagittaria cuneaire, tule potato, wapato
delta arrowhead
emersed, floating, and submersed; submersed phyllodial, flattened, to 45 cm; floating with petiole triangular, to 100 cm, blade cordate or sagittate, rarely linear or ovate, 7.5–9 × 3.5–4 cm; emersed with petiole recurved, 3.5–51 cm, blade linear to sagittate, 2.5–17 × 1.5–11 cm, basal lobes when present shorter than remainder of blade.
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, rarely panicles, of 2–10 whorls, emersed, 14–21 × 2–10 cm, peduncle triangular, 10–50 cm;
bracts connate more than or equal to ¼ total length, lance-attenuate or acute, mostly (4–)7–40 mm, membranous, not papillose; fruiting pedicels ascending, cylindric, 0.5–2 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 25 mm diam.;
sepals recurved, not enclosing flower or fruiting head;
filaments not dilated, equal to or longer than anthers, glabrous;
pistillate pedicellate, without ring of sterile stamens.
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 0.8–1.5 cm diam.;
achenes obovoid, abaxially keeled, 1.8–2.6 × 1.3–2.5 mm, beaked;
face not tuberculate, wings 0–1, ± entire, glands 0–1;
beak apical, erect, 0.1–0.4 mm.
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.
= 22.
Sagittaria cuneata
Sagittaria platyphylla
Sagittaria cuneata is extremely variable. On emersed plants, the leaf petioles are often bent toward the ground. Submersed plants often grow from a basal rosette with a long flexuous petiole and a floating sagittate leave. Plants in deep rivers often develop broad, straplike phyllodia.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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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