Description
Petioles 2 - 3 x longer than the blade, membraneously alate on the base, thin to densely pilose under the blade. Pubescence simple or stellate and absent on young or submerged plants. Blade membraneous, sagittato-cordate or triangularly obovate with long blunt lobes, approximately as wide as the midrib length and widest at the base. Blade (6.5) - 20 - 30 cm long and (7_ - 20 - 30 cm wide with 11 - 13 veins (7 - 15 are possible). No pellucid markings.
Stem upright, about twice as long as the leaves, cylindrical, between the whorls triangular, pubescent under whorls as well as petioles.
Inflorescence rarely racemose, usually paniculate having 6 - 13 whorls containing 6 - 9 flowers each. Bracts lanceolate, densely ribbed. Bracts in the first whorl as long as the pedicels, in the other whorls they are a third shorter. Pedicels 1 - 3.5 cm long, sepals broadly ovate, leather-like, densely ribbed, 5 - 6 mm long, petals white, obovate, 15 - 18 mm long, stamens 20 - 24, filaments longer than the anthers, pistils numerous, style longer than the ovary.
Aggregate fruit globular, echinate, 6 - 8 mm in diameter. Achenes flat, subovately-cuneate, 3 x 1.5 mm with 3 - 5 (usually 3) lateral ribs and 2 - 3 oblong and further 3 - 5 small round glands. Stylar beak usually straight, approximately 0.75 mm.
Read more about this topic: Echinodorus Macrophyllus
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