Echinodorus osiris
Encyclopedia
In Rataj's taxonomy E. osiris, commonly known as the melon sword, is in section Uruguayensii, subgenus Echinodorus
.
Other authorities consider this species as part of Echinodorus uruguayensis
.
Seems to have been first collected by Hans Griem in the 1950s but was re-collected by Thomas Horemann. Found naturally in running, relatively cool waters coming down from the mountains. On the bottom of these rivers it forms stands of hundreds of plants.
membraneous, young leaves golden-brown, older leaves green, 3- to 60 cm long. Petioles 8 to 20 cm long, blades 20 to 30 cm long by 3 to 5.5 cm wide, oval, on both ends acuminate, having undulate margins and 3 to 5 veins. Veins pseudopinnerved or orientated towards the base. Emerse leaves 50 to 80 cm, occasionally 100 cm, long, petioles irregularly cylindrical, 40 to 70 cm long, blades pvalm or ovate, 14 to 18 cm long by 7 to 10 cm wide having 5 to 7 veins. Emersed and submersed leaves trimmed with distinct pelucid lines.
Stems upright, later deflexed, 80 to 150 cm long, proliferous. Inflorescence
racemose or branched in the lower whorl, having 6 to 12 whorls containing 6 to 12 flowers each. Bracts lanceolate, 1.5 to 2 cm long by 5 to 6 mm wide, pedicel
s 1 to 4 cm long. Sepal
s 5 to 6 mm long, corolla white, stamens 18 to 24, achenes unknown.
with medium-hard water, a good substrate, tropical temperatures (though it can tolerate cooler water). Good light. Propagated by division and by adventitious plantlets. The red colour seems more intense in cooler waters, but seems to fade in iron-deficient waters.
A splendid specimen plant for the larger aquarium.
There seem to be several different forms, including triploid and tetraploid forms. This needs more investigation. No fertile seeds have been observed.
Echinodorus
Echinodorus is a genus of plants in the family Alismataceae and distributed in the Western Hemisphere. Its scientific name is derived from Ancient Greek echius – rough husk, and doros – leathern bottle, alluding to ovaries, which in some species are armed with persistent styles,...
.
Other authorities consider this species as part of Echinodorus uruguayensis
Echinodorus uruguayensis
In Rataj's taxonomy E. uruguayensis is in Section Uruguayensii, Subgenus Echinodorus-Synonyms:E. subulatus Niederlein; E. martii var. uruguayensis Hauman; E. grandiflorusIn the aquarium trade E. horemanii seems often to be really E...
.
Synonyms
E. osiris rubra hort.; E. species rubra hort.; E. Schweden; E. species; E. peruensis var. rubraDistribution
Southern Brazil.Seems to have been first collected by Hans Griem in the 1950s but was re-collected by Thomas Horemann. Found naturally in running, relatively cool waters coming down from the mountains. On the bottom of these rivers it forms stands of hundreds of plants.
Description
Submersed leavesLeaves
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membraneous, young leaves golden-brown, older leaves green, 3- to 60 cm long. Petioles 8 to 20 cm long, blades 20 to 30 cm long by 3 to 5.5 cm wide, oval, on both ends acuminate, having undulate margins and 3 to 5 veins. Veins pseudopinnerved or orientated towards the base. Emerse leaves 50 to 80 cm, occasionally 100 cm, long, petioles irregularly cylindrical, 40 to 70 cm long, blades pvalm or ovate, 14 to 18 cm long by 7 to 10 cm wide having 5 to 7 veins. Emersed and submersed leaves trimmed with distinct pelucid lines.
Stems upright, later deflexed, 80 to 150 cm long, proliferous. Inflorescence
Inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...
racemose or branched in the lower whorl, having 6 to 12 whorls containing 6 to 12 flowers each. Bracts lanceolate, 1.5 to 2 cm long by 5 to 6 mm wide, pedicel
Pedicel (botany)
A pedicel is a stem that attaches single flowers to the main stem of the inflorescence. It is the branches or stalks that hold each flower in an inflorescence that contains more than one flower....
s 1 to 4 cm long. Sepal
Sepal
A sepal is a part of the flower of angiosperms . Collectively the sepals form the calyx, which is the outermost whorl of parts that form a flower. Usually green, sepals have the typical function of protecting the petals when the flower is in bud...
s 5 to 6 mm long, corolla white, stamens 18 to 24, achenes unknown.
Cultivation
Needs a spacious aquariumAquarium
An aquarium is a vivarium consisting of at least one transparent side in which water-dwelling plants or animals are kept. Fishkeepers use aquaria to keep fish, invertebrates, amphibians, marine mammals, turtles, and aquatic plants...
with medium-hard water, a good substrate, tropical temperatures (though it can tolerate cooler water). Good light. Propagated by division and by adventitious plantlets. The red colour seems more intense in cooler waters, but seems to fade in iron-deficient waters.
A splendid specimen plant for the larger aquarium.
There seem to be several different forms, including triploid and tetraploid forms. This needs more investigation. No fertile seeds have been observed.