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Trithuria filamentosa
Species of aquatic plant From Wikipedia, the free encyclopedia
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Trithuria filamentosa is a species of aquatic plant in the family Hydatellaceae endemic to Tasmania, Australia.[1]
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Description
Vegetative characteristics
It is an annual or perennial, diminutive, aquatic herb[2] with elongate, 0.7–1.5 mm wide, erect, sympodial rhizomes with adventitious roots.[3] The pale green, linear, acute leaves[4] are 1-2 cm long.[5]
Generative characteristics
It is a monoecious species with mostly unisexual reproductive units ("flowers"), but more rarely with bisexual reproductive units.[6][7] The male reproductive units, which are fewer in number than the female ones,[2][7] consist of 2–4, lanceolate, 3–5 mm long bracts, as well as 4–6 stamens. The stamens have red to purple, 2 mm long anthers, and 6 mm long filaments.[7] The female reproductive units consist of 2–4(5) bracts,[6] as well as up to 20 carpels. The elliptical-ovoid, fruit is indehiscent.[2] The seeds are smooth.[6] It may be reproducing apomictically, or may predominantly rely on self-pollination.[8] Flowering and fruiting occurs from December to April.[2][9]
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Cytology
The chloroplast genome is 180562 bp long.[10]
Distribution
It is endemic to Tasmania, Australia.[1]
Taxonomy
It was described by Leonard Rodway in 1897.[4] The lectotype was collected by Rodway in Broad River, Tasmania, Australia in December 1896.[11][6] It is placed in the section Trithuria sect. Hydatella.[8]
Etymology
The specific epithet filamentosa, from the Latin 'filum' for thread, means thread-like.[12][13] The stamens have long, filiform filaments.[4]
Ecology
It occurs in marshes, pools on mud flats along rivers,[4] lakes, tarns,[2][5] and stream margins.[2]
References
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