Echinodorus horizontalis
Encyclopedia
In Rataj's taxonomy E. bleheri is in Section Longipetali, Subgenus Echinodorus
25 - 40 cm long, blades join the petiole at an obtuse angle so that they stand nearly horizontally, they are ovate or cordate, on the tip acuminate, the base truncate or shortly lobate, usually with 7 veins, 10 - 17 cm long x 5 - 8 cm wide.
Stem recurved, proliferous, 25 - 60 cm long. Inflorescence
racemose, having 2 - 4 whorls containing only 3 - 6 flowers each. Bracts shorter than pedicels. Pedicels 1 - 1.5 cm long, sepals ovate, membraneous, 4 - 6 mm long, having 18 - 24 ribs. During ripening the sepals enlarge and cover partly the aggregate fruit
. Petals white, ovate, corolla 1.5 - 1.8 cm in diameter, stamens 26 - 30. Anthers oblong, 5 - 10 x shorter than filaments. Aggregate fruit
globular, 0.7 - 0.9 cm in diameter, achenes 3 mm long x 1 mm wide, having 3 - 4 ribs and usually 6 glands in 2 rows. Young leaves
are red and brown, older leaves
green.
The flowers open in the later morning hours only for about 2 hours. After this, it closes completely. E. horizontalis opens its flowers even unter water. The plant is self fertile.
Seed germination seems variable, but Rataj & Horemann report most success at higher temperatures (28 C).
Without flowers it can be confused with other species such as E. tunicatus, and rarely seems to be offered as the true species in the trade.
Description
LeavesLeaves
-History:Vocalist Arnar Gudjonsson was formerly the guitarist with Mower, and he was joined by Hallur Hallsson , Arnar Ólafsson , Bjarni Grímsson , and Andri Ásgrímsson . Late in 2001 they played with Emiliana Torrini and drew early praise from the New York Times...
25 - 40 cm long, blades join the petiole at an obtuse angle so that they stand nearly horizontally, they are ovate or cordate, on the tip acuminate, the base truncate or shortly lobate, usually with 7 veins, 10 - 17 cm long x 5 - 8 cm wide.
Stem recurved, proliferous, 25 - 60 cm long. 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, having 2 - 4 whorls containing only 3 - 6 flowers each. Bracts shorter than pedicels. Pedicels 1 - 1.5 cm long, sepals ovate, membraneous, 4 - 6 mm long, having 18 - 24 ribs. During ripening the sepals enlarge and cover partly the aggregate fruit
Fruit
In broad terms, a fruit is a structure of a plant that contains its seeds.The term has different meanings dependent on context. In non-technical usage, such as food preparation, fruit normally means the fleshy seed-associated structures of certain plants that are sweet and edible in the raw state,...
. Petals white, ovate, corolla 1.5 - 1.8 cm in diameter, stamens 26 - 30. Anthers oblong, 5 - 10 x shorter than filaments. Aggregate fruit
Fruit
In broad terms, a fruit is a structure of a plant that contains its seeds.The term has different meanings dependent on context. In non-technical usage, such as food preparation, fruit normally means the fleshy seed-associated structures of certain plants that are sweet and edible in the raw state,...
globular, 0.7 - 0.9 cm in diameter, achenes 3 mm long x 1 mm wide, having 3 - 4 ribs and usually 6 glands in 2 rows. Young leaves
Leaves
-History:Vocalist Arnar Gudjonsson was formerly the guitarist with Mower, and he was joined by Hallur Hallsson , Arnar Ólafsson , Bjarni Grímsson , and Andri Ásgrímsson . Late in 2001 they played with Emiliana Torrini and drew early praise from the New York Times...
are red and brown, older leaves
Leaves
-History:Vocalist Arnar Gudjonsson was formerly the guitarist with Mower, and he was joined by Hallur Hallsson , Arnar Ólafsson , Bjarni Grímsson , and Andri Ásgrímsson . Late in 2001 they played with Emiliana Torrini and drew early praise from the New York Times...
green.
Cultivation
Deep, bed of rich substrate. Plenty of light and water on the soft, acid side. Tropical temperatures. It will grow well emerse or submerse. Propagate by adventitious plantlets which form on the inflorescence. A rather demanding species, now rarely seen.The flowers open in the later morning hours only for about 2 hours. After this, it closes completely. E. horizontalis opens its flowers even unter water. The plant is self fertile.
Seed germination seems variable, but Rataj & Horemann report most success at higher temperatures (28 C).
Without flowers it can be confused with other species such as E. tunicatus, and rarely seems to be offered as the true species in the trade.