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Drosera
''Drosera'', commonly known as the sundews, is one of the largest genera of carnivorous plants, with at least 194 species.〔McPherson, S.R. 2010. ''Carnivorous Plants and their Habitats''. 2 volumes. Redfern Natural History Productions Ltd., Poole.〕 These members of the family Droseraceae lure, capture, and digest insects using stalked mucilaginous glands covering their leaf surfaces. The insects are used to supplement the poor mineral nutrition of the soil in which they grow. Various species, which vary greatly in size and form, can be found growing natively on every continent except Antarctica.〔McPherson, S.R. 2008. ''Glistening Carnivores''. Redfern Natural History Productions Ltd., Poole.〕
Both the botanical name (from the Greek δρόσος: ''drosos'' = "dew, dewdrops") and the English common name (sundew, derived from Latin ''ros solis'', meaning "dew of the sun") refer to the glistening drops of mucilage at the tip of each tentacle that resemble drops of morning dew.
== Characteristics ==
Sundews are perennial (or rarely annual) herbaceous plants, forming prostrate or upright rosettes between in height, depending on the species. Climbing species form scrambling stems which can reach much longer lengths, up to in the case of ''D. erythrogyne''.〔Mann, Phill (2001). ''(The world's largest Drosera )''; Carnivorous Plant Newsletter, Vol 30, #3: pg 79.〕 Sundews have been shown to be able to achieve a lifespan of 50 years.〔Barthlott ''et al.'', ''Karnivoren'', p. 102〕 The genus is so specialized for nutrient uptake through its carnivorous behavior, the pygmy sundew is missing the enzymes (nitrate reductase, in particular) that plants normally use for the uptake of earth-bound nitrates.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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