Echinodorus cordifolius subsp. cordifolius

Illustrated
Synonyms: Echinodorus radicans
Treatment appears in FNA Volume 22.

Herbs, perennial, stout, to 100 cm; rhizomes present. Leaves emersed, submersed leaves mostly absent; petiole 5–6-ridged, 17.5–45 cm; blade with translucent markings distinct lines, ovate to elliptic, 6.5–32 ´ 2.5–19.1 cm, base truncate to cordate. Inflorescences racemes, of 3–9 whorls, each 3–15-flowered, decumbent to arching, to 62 ´ 8–18 cm, often proliferating; peduncles terete, 35–56 cm; rachis triangular; bracts distinct, subulate, 10–21 mm, coarse, margins coarse; pedicels erect to ascending, 2.1–7.5 cm. Flowers to 25 mm wide; sepals spreading, 10–12-veined, veins papillate; petals not clawed; stamens 22; anthers versatile; pistils 200–250. Fruits oblanceolate, plump, 3–4-ribbed, abaxially 1-keeled, 2–3.5 ´ 0.9–1.5 mm; glands 3–4; beak terminal,1–1.3 mm. 2n = 22.


Phenology: Flowering late summer–early fall.
Habitat: Clay soils of wet ditches, streams, and shallow ponds
Elevation: 0–500 m

Distribution

V22 604-distribution-map.jpg

Ala., Ark., Fla., Ga., Ill., Ind., Kans., Ky., La., Miss., Mo., N.C., Okla., S.C., Tenn., Tex., Va., Mexico (Tamaulipas), West Indies, South America

Discussion

Echinodorus cordifolius is very easily determined, as it is the only species with arching to decumbent inflorescences. In addition, it is the only one with papillate veins on the sepals.

Selected References

None.

Lower Taxa

None.
Obtuse (?) +  and Acute (?) +
Robert R. Haynes +  and C. Barre Hellquist +
(Linnaeus) Grisebach +
truncate;cordate +
Alisma cordifolia +
0.1 cm1 mm <br />0.001 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
ovate +  and elliptic +
2.5 cm25 mm <br />0.025 m <br /> (19.1 cm191 mm <br />0.191 m <br />) +
distinct +
shorter than to longer than pedicels +
subulate +
Ala. +, Ark. +, Fla. +, Ga. +, Ill. +, Ind. +, Kans. +, Ky. +, La. +, Miss. +, Mo. +, N.C. +, Okla. +, S.C. +, Tenn. +, Tex. +, Va. +, Mexico (Tamaulipas) +, West Indies +  and South America +
0–500 m +
u--shaped +
subsessile +  and pedicellate +
hypogynous +
0mm;25mm +
1-keeled +  and oblanceolate +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
3 (?) +  and 4 (?) +
Clay soils of wet ditches, streams, and shallow ponds +
decumbent +  and floating +
decumbent +  and erect +
decumbent +  and arching +
8 cm80 mm <br />0.08 m <br /> (18 cm180 mm <br />0.18 m <br />) +
petiolate +  and sessile +
distinct +
decumbent +  and floating +
decumbent +  and erect +
erect +  and ascending +
2.1 cm21 mm <br />0.021 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
35 cm350 mm <br />0.35 m <br /> (56 cm560 mm <br />0.56 m <br />) +
deciduous +
5-6-ridged +
17.5 cm175 mm <br />0.175 m <br /> (45 cm450 mm <br />0.45 m <br />) +
Flowering late summer–early fall. +
Abhandlungen der Koniglichen Gesellschaft der Wissenschaften zu Gottingen +
decumbent +  and floating +
decumbent +  and erect +
triangular +
not septate +
10-12-veined +
persistent +
herbaceous;leathery +
Illustrated +
lateral +  and terminal +
papillose +  and smooth +
Echinodorus radicans +
Echinodorus cordifolius subsp. cordifolius +
Echinodorus cordifolius +
subspecies +
papillate +
submersed +  and emersed +
glabrous +  and stellate-pubescent +
bracteolate +  and branching +