Flora of North America species comparison

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Sagittaria platyphylla

delta arrowhead
Habit Herbs, perennial, to 150 cm; rhizomes absent; stolons present; corms present.
Leaves

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.
Inflorescences

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.
Flowers

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.
Fruiting

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.
2n

= 22.

Sagittaria platyphylla
Phenology Flowering summer–fall.
Habitat Streams and lakes
Elevation 0–900 m (0–3000 ft)
Distribution
from FNA
AL; AR; FL; GA; IL; KY; LA; MO; MS; OH; OK; PA; TN; TX; WV; Mexico (Nuevo León Mexico, sw Mexico); Central America (Panama)
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[BONAP county map]
Discussion

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.)
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. rigida, S. sanfordii, S. secundifolia, S. subulata, S. teres
Synonyms S. graminea var. platyphylla, S.. mohrii
Name authority (Engelmann) J. G. Smith: N. Amer. Sagittaria. 29. (1894)
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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