Aquarius uruguayensis (Arechav.) Christenh. & Byng
Basionym : Echinodorus uruguayensis Arechav.[1]
Synonyms:
Echinodorus aschersonianus Graebn.
Echinodorus grandiflorus var. pusillus Micheli
Echinodorus martii var. uruguayensis (Arechav.) Hauman
Occurrence:
Uruguay, northern Argentina, southern Paraguay and southern Brazil.
Ecology
Grows in small rivers with clear water, most frequently in rapids. From sea level to 300 m.
Morphology General habit
Perennial, from long rhizomes, glabrous, up to 60 cm, rhizomes up to 20 cm long, 5 mm diam. Leaves floating, emersed and submersed, floating leaves elliptic-ovate, 5-veined c. 15 cm long, 4 - 6 cm wide, translucent markings present as lines, apex round, base attenuated, petioles round, 12 - 24 cm long, 3 mm diam, base with sheath up to 13 cm long, emerged leaves lanceolate-elliptic, 3-veined, c. 7 cm long, 1.5 - 2 cm wide, translucent markings present as lines, apex acute, base attenuate, petioles round, 2 - 7 cm long, 2 mm in diam., base with sheath to 1 cm long, submersed leaves linear, 3 - 5 pseudo-pinnate veins, 10 - 33 cm long, 1.5 - 4.5 cm wide, glaucous markings absent or present as lines, apex round, base attenuated, petioles triangular in cross-section, up to 11 cm long, 4 mm in diameter, base with a sheath up to 8 cm long
Morphology Reproductive morphology Fruits
Fruit obovate, 2 - 3 ribbed, glandular, approx. 2 mm long, 0.6 mm wide, glands 2 - 3, separated by ribs, round, beak end, erect, 0.2 - 0.7 mm.
Morphology Reproductive morphology Inflorescences
Inflorescence racemes, 3 - 6 whorls, 4 - 10 flowers each, erect to prostrate, leaves pendulous, often spreading, 10 - 30 cm long, 5 cm wide, spindles triangular in cross-section, pedicels round, 20 - 40 cm long, 3 mm in diameter, bracts free, lanceolate, 0.7 - 6 cm long, 4 - 8 mm wide, 9 - 15-veined, apex pointed, pedicels in flowers and fruits spreading, round, 1.5 - 5 cm long, 0.5 mm diam. flowers 3.5 - 4.7 cm in diameter, fragrant, sepals erect, 8 - 14-veined, ca. 7 mm long, ca. 4 mm wide, veins without papillae, petals spreading, white, not clawed, overlapping, ca. 18 mm long, ca. 23 mm wide, stamens 18 - 22, anthers many-sided, ca. 1.5 mm long, filaments ca. 2 mm long, carpels numerous
Phenology
Flowering and fruiting from September to May.[1]
