Echinodorus cordifolius (L.) Griseb.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Alismataceae
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Scientific Name
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Description
Species Description - Perennial, the fibrous roots often prominently tuberculate; scape at first erect, but soon prostrate and even rooting, often producing small lvs and bulbils at the nodes of the infl; lvs erect, broadly ovate, obtuse, ± cordate at base, 5–20 × 3–15 cm; pellucid lines of the lvs mostly 1 mm or more apart and rarely over 1 mm long; fls in whorls of 5–15 on long, lax, often ± recurved pedicels; bracts lance-linear, long-acuminate, 1–2.5 cm; sep ovate to orbicular, obtuse, 5–7 mm, ± reflexed in fr, the veins evidently raised-roughened on the back; pet white, obovate, 6–12 mm; stamens ca 21; anthers 1–1.5 mm, versatile; achenes 40+, brown, 1.8–2.5 mm, with an ascending beak only 0.2–0.5 mm, the fruiting head ca 1 cm thick, nearly smooth in profile; each side of the achene with 3–4 abruptly curved and sometimes joining ribs of which the 1 or 2 toward the dorsal edge are wing-like distally; summit of the keel often crested; glands of the achene rounded at both ends and not closely approaching the beak; 2n=22. Swamps; D.C. to Fla., along the coastal plain, w. to Tex., and n. in the interior to s. Ind., Ill., Mo., and Kans., s. to tropical Amer. July–Oct. (E. radicans) Ours is nomenclaturally typical.
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Common Names
creeping burr-head