Echinodorus osiris
From Wikipedia, the free encyclopedia
 |
||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Scientific classification | ||||||||||||||
|
||||||||||||||
|
|
||||||||||||||
| Echinodorus osiris Rataj in Folio geobot. phytotax. Praha 5:213-4, 1970 |
In Rataj's taxonomy E. osiris is in Section Uruguayensii, Subgenus Echinodorus.
Other authorities consider this species as part of Echinodorus uruguayensis.
Contents |
[edit] Synonyms
E. osiris rubra hort.; E. species rubra hort.; E. Schweden; E. species; E. pervensis var. rubra
[edit] Description
Submersed leaves membraneous, young leaves golden-brown, older leaves green, 3- - 60 cm long. Petioles 8 - 20 cm long, blades 20 - 30 cm long x (3) - 5.5 cm wide, oval, on both ends acuminate, having undulate margins and (3) - 5 veins. Veins pseudopinnerved or orientated towards the base. Emerse leaves 50 - 80 - (100) cm long, petiloes irregularly cylindrical, 40 - 70 cm long, blades pvalm or ovate, 14 - 18 cm long x 7 - 10 cm wide having 5 - 7 veins. Emersed and submersed leaves trimmed with distinct pelucid lines.
Stems upright, later deflexed, 80 - 150 cm long, proliferous. Inflorescence racemose or branched in the lower whorl, having 6 - 12 whorls containing 6 - 9 - 12 flowers each. Bracts lanceolate, 1.5 - 2 cm long x 5 - 6 mm wide, pedicels 1 - 2 - 4 cm long. Sepals 5 - 6 mm long, corolla white, stamens 18 - (24), achenes unknown.
[edit] Distribution
Southern Brazil. Seems to have been first collected by Hans Griem in the 1950's 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.
[edit] Cultivation
Needs a spacius aquarium 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.
