Sagittaria platyphylla
Sagittaria kurziana
delta arrowhead
springtape
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.
submersed and floating, sessile, phyllodial, flattened, 50–250 × 0.4–1.5 cm;
rare stranded plants without expanded leaf blades.
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, rarely panicles, of 4–10 whorls, floating to slightly emersed, 15–25 × 5–15 cm;
peduncles to 200 cm;
bracts connate less than or equal to total length, lanceolate, 0.4–0.8 mm, delicate, not papillose; fruiting pedicels spreading to recurved, cylindric, 1.5–4.5 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 2.8 cm diam.;
sepals erect to spreading in staminate, erect in pistillate, enclosing flower or fruiting head;
filaments dilated, ± equaling anthers, glabrous;
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 0.7–1 cm diam.;
achenes obovoid, abaxially keeled, 5 × 2.5 mm, beaked;
faces not tuberculate, wings absent, glands 0–1;
beak lateral, erect, 1 mm.
= 22.
= 22.
Sagittaria platyphylla
Sagittaria kurziana
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.)
Sagittaria kurziana is a distinctive species found in springs and clear streams, often with high sulfur content. The plants form huge colonies, essentially filling the stream with their long flexible leaves that wave back and forth in the water current.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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