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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 ]
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.
Argyroxiphium is a small genus of plants in the family Asteraceae. [2] [3] Its members are known by the common names silversword or greensword due to their long, narrow leaves and the silvery hairs on some species.
Asclepias fascicularis is a flowering perennial herb sending up many thin, erect stems and bearing distinctive long pointed leaves which are very narrow and often whorled about the stem, giving the plant its common names. [2] [3] It blooms in clusters of lavender, pale pink, purple, white, to greenish shades of flowers. [3]
The Mauna Loa silversword can reach up to 1.8 meters (5.91 feet) in height and produce multiple flowering branches. Each rosette, or branch of the plant, can grow for 20 to 30 years and may reach 40–70 cm (15.7–31.5 inches) before flowering and producing dry fruit. Each fruit contains a single seed.
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.
Polystichum imbricans is a species of fern known by the common names narrowleaf swordfern [1] and imbricate sword fern. It is native to western North America from British Columbia and Idaho to southern California , where it grows in rocky soil and cracks in rock outcrops in coastal and inland mountain ranges and foothills.
Cephalanthera longifolia, the narrow-leaved helleborine, [3] sword-leaved helleborine or long-leaved helleborine, is a rhizomatous herbaceous perennial plant in the family Orchidaceae. It is native to light woodland, and widespread across Europe , Asia and North Africa from Ireland and Morocco to China .
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