Echinodorus floridanus

R. R. Haynes & Burkhalter

Castanea 63: 180, fig. 1. 1998.

EndemicConservation concern
Treatment appears in FNA Volume 22.

Herbs, perennial, stout, to 200 cm; rhizomes present. Leaves emersed; petiole 4–5-ridged, to 115 cm; blade with translucent markings dots and short distinct lines, absent in smaller leaves, elliptic to broadly ovate, 16–28 × 8–23 cm, base attentuate to cordate. Inflorescences panicles, of 4–9 whorls, each 9–16-flowered, erect, to 65 × 45 cm, not proliferating; peduncles ridged, to 131 cm; rachis 3–4-ridged; bracts distinct, lanceolate, 4–7 mm, coarse, margins coarse; pedicels spreading, 1.5–7.5 cm. Flowers 4 cm wide; sepals erect, 21-veined, veins not papillate; petals not clawed; stamens 21; anthers versatile; pistils ca. 200. Fruits oblanceolate, terete, 5-ribbed, not abaxially keeled, 2.5 × 0.6–1 mm; glands 4–5; beak terminal, 0.5 mm. Chromosome number unknown.


Phenology: Flowering summer–fall.
Habitat: Sandy soil at edge of broadleaf evergreen forest
Elevation: 0–10 m

Discussion

Echinodorus floridanus is a recently discovered taxon, known only from the type locality, which is within metropolitan Pensacola, Florida. The plants form a large colony that is bisected by a state highway. This species is by far the largest species of the genus in North America.

Of conservation concern.

Selected References

None.

Lower Taxa

None.
... more about "Echinodorus floridanus"
Obtuse (?) +  and Acute (?) +
Robert R. Haynes +  and C. Barre Hellquist +
R. R. Haynes & Burkhalter +
attentuate;cordate +
0.5 cm5 mm <br />0.005 m <br /> (?) +
16 cm160 mm <br />0.16 m <br /> (28 cm280 mm <br />0.28 m <br />) +
elliptic +  and broadly ovate +
8cm +  and 23cm +
distinct +
shorter than to longer than pedicels +
lanceolate +
0–10 m +
u--shaped +
subsessile +  and pedicellate +
hypogynous +
keeled +, terete +  and oblanceolate +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
4 (?) +  and 5 (?) +
Sandy soil at edge of broadleaf evergreen forest +
decumbent +  and floating +
decumbent +  and erect +
0 cm0 mm <br />0 m <br /> (45 cm450 mm <br />0.45 m <br />) +
petiolate +  and sessile +
distinct +
decumbent +  and floating +
decumbent +  and erect +
1.5 cm15 mm <br />0.015 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
0 cm0 mm <br />0 m <br /> (131 cm1,310 mm <br />1.31 m <br />) +
deciduous +
4-5-ridged +
0 cm0 mm <br />0 m <br /> (115 cm1,150 mm <br />1.15 m <br />) +
Flowering summer–fall. +
decumbent +  and floating +
decumbent +  and erect +
3-4-ridged +
not septate +
persistent +
herbaceous;leathery +
Endemic +  and Conservation concern +
lateral +  and terminal +
papillose +  and smooth +
Helianthium +
Echinodorus floridanus +
Echinodorus +
species +
not papillate +
submersed +  and emersed +
glabrous +  and stellate-pubescent +
bracteolate +  and branching +