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Helanthium tenellum, the pygmy chain sword, is a species of plants in the Alismataceae. It is native to the eastern United States (from Texas to Florida , north to Michigan and Massachusetts ), southern Mexico ( Chiapas , Veracruz ), West Indies (Cuba, Jamaica, Hispaniola ), Central America, South America (from Guyana to Argentina) [ 1 ] [ 2 ]
The Malayan sword is a shrubby plant that grows to about 0.2 to 1.2 m (7.9 in to 3 ft 11.2 in) tall with straight stems. Its dark-green leaves are arranged spirally. The leaves are oval-shaped, with a length between 10 – 35 cm and a width between 1.9 – 25 cm, and sunken veins. The fruits are red and ovoid.
Echinodorus cordifolius, the spade-leaf sword or creeping burhead, is a species of aquatic plants in the Alismatales. It is native to Mexico , the West Indies , Central America , South America (as far south as Paraguay ) and the southeastern United States ( Texas to Florida and as far north as Iowa ).
The Amazon sword plants are one of the most popular aquarium plants for their attractive form and general hardiness. A submerged culture system was developed for rapid micropropagation of this commercially important aquarium plant, ‘Amazon sword’ ( Echinodorus ‘Indian Red’).
At senescence, which often occurs when the plant reaches a diameter of approximately 0.5 metres (1.6 ft), the plant produces a tall stalk in just a few weeks of maroon ray flowers which resemble the sunflower. Flowering usually occurs from July through October. [3] The leaves become limp and dry as the monocarpic plant then goes to seed and dies.
The Mauna Kea silversword is an erect, single-stemmed and monocarpic or rarely branched and polycarpic basally woody herb, producing a globe-shaped cluster of thick, spirally arranged, sword-shaped silvery-green floccose-sericeous, linear-ligulate to linear-lanceolate leaves growing in a rosette.
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Echinodorus grisebachii or Echinodorus amazonicus is commonly known as Amazon sword plant, although other plants are also known under this common name.The aquatic plant is cultivated for and used in ponds and artificial aquatic habitats.