Pontederia rotundifolia L.F.

Plants rooting or creeping in the mud, with stems prostrate-ascending or floating. Leaves (or lower spathe valve) with ovate, sagittate, or reniform-cordate blade, up to 12 cm. long and 18 cm. broad; stipulate petiole up to 25 cm. long, slightly dilated for its lower half. Spathe sub-ensheathing the shortly spicate inflorescence; rachis pilose. Flowers condensed on rachis, 1.7-2.2 cm. long, more or less pilose and light-translucent except for few to many red-brown resin streaks prominent on the expanded perianth segments; tube about 1 cm. long, glandular-pubescent with rod-shaped glands, 2-3 mm. long; upper corolla lobe expanded and with twin yellow blotches, one on each side of mid-vein (often inconspicuous in fresh flowers), fused toward the base to the adjacent calyx lobes; calyx lobes slightly narrower than the corolla lobes, about 7 mm. long; filaments adnate to the tube at different levels, glandular-pubescent, up to 9 mm. long; anthers narrowly ovate, narrowed toward the apex, 1-1.5 mm. long; fully developed style 1.5 cm. long, with a subcapitate 6-lobed stigma. Fruit ovoid, spiny, about 6-7 mm. long.

Can be grown by cuttings, divisions or seedlings.