Aquarius horizontalis (Rataj) Christenh. & Byng
Basionym : Echinodorus horizontalis Rataj[1]
Occurrence:
Amazonia.
Ecology
Grows in palm swamps, flooded forests along blackwater rivers and small streams in Tierra firme. From sea level to 450 m.
Morphology General habit
Perennial, from erect rhizomes, glabrous, up to 100 cm, rhizomes up to 10 cm long, 1 cm diam. Leaves emersed, blades ovate, 7 - 9-veined, 11 - 30 cm long, 6 - 17 cm wide, translucent markings present as a net-like network, tip pointed, base heart-shaped, petioles round, 17 - 50 cm long, 4 mm diameter, base with sheath up to 15 cm long.
Morphology Reproductive morphology Fruits
Fruit club, 3 - 4-ribbed, glandular, 1.8 - 2.8 mm long, 1 mm wide, glands 5 - 6, round, beak end, horizontal, approx. 0.3 - 0.5 mm.
Morphology Reproductive morphology Inflorescences
Inflorescence racemose, of 2 - 5 whorls, each 2 - 5-flowered, procumbent, protruding leaves, reproductive, up to 70 cm long, 5 cm wide, rachis round in cross-section, peduncle round, up to 60 cm long, 2 mm in diameter ., bracts deciduous, free, lanceolate, coarse, 1 - 2.5 cm long, 4 - 8 mm wide, c. 12 - 16-veined, pointed tip, pedicels spread out in flower and bent back in fruit, round, 1 - 3 cm long, 1 mm diam. flowers only open for a few hours in the morning, 1.5 - 1.8 cm in diameter, sepals erect, 19 - 24 veins, approx. 10 mm long, approx. 10 mm wide, veins without papillae, petals spread out, white, not clawed, not overlapping, approx. 10 mm
