Echinodorus horizontalis

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Echinodorus horizontalis


Herb, perennial, to 150 cm tall, glabrous; rhizome short, erect; stolon present. Leaves emerged, olive-green to greenish brown, petiole terete, 2-4 times as long as blade, 50-60 x 0.5 cm, basal sheath to 10 cm long, blade ovate, 10-25 x 10-15 cm, margin entire, apex acuminate, base cordate, lobes rounded, veins 7-11, pellucid markings present, forming a network independent of veins. Inflorescence racemose, decumbant, with 3-4 whorls, overtopping leaves, vegetatively proliferating, 100 x 3-4 cm; whorls with 3-6 flowers; peduncle terete, 50 x 0.01-0.04 cm; rachis between whorls terete; bracts longer than pedicel subtended, coarse inward, membranaceous along margin, ovate, 30 x 0.3-0.6 mm, apex long-acuminate; pedicels in flower spreading, in fruit reflexed, cylindrical, 2 x 0.05-0.1 cm. Flowers ca. 1.5 cm wide; sepals erect, appressed to mature fruiting aggregate, 10 x 8 mm, 22-28-veined, not papillose; petals not clawed, 5-6 x ca. 4 mm; stamens 24-30, filaments ca. 1.5 mm long, anthers versatile, ca. 1.5 mm long, apex obtuse; carpels numerous. Fruit terete, clavate, 2.5-3 x 0.2-0.8 mm, 3-ribbed, without keel, glands 6-9, circular, irregularly arranged, often 4-6 in upper half and 1-4 in lower half of fruit, beak terminal, recurved, to 0.8 mm long.


Guyana present present, Southern America: Colombia (Colombia present); Peru (Peru present); Venezuela (Venezuela present)
Colombia, Venezuela, Guyana, S to Peru and Brazil, at ; ca. 25 collections examined, including 1 from Guyana (GU: 1).


Flowering and fruiting .


Sold under German commercial name "Horizontale Amazonpflanze" ("Horizontal Amazon plant").