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luffa
''Luffa'' is a genus of tropical and subtropical vines in the cucumber (Cucurbitaceae) family.
In everyday non-technical usage, the luffa, also spelled loofah, usually means the fruit of the two species ''L. aegyptiaca'' and ''L. acutangula''. The fruit of these species is cultivated and eaten as a vegetable. The fruit must be harvested at a young stage of development to be edible. The vegetable is popular in China and Vietnam.〔(【引用サイトリンク】title=''Luffa aegyptiaca'' )〕 When the fruit is fully ripened it is very fibrous. The fully developed fruit is the source of the loofah scrubbing sponge which is used in bathrooms and kitchens. ''Luffa'' are not frost-hardy, and require 150 to 200 warm days to mature.
The name ''luffa'' was taken by European botanists in the 17th century from the Egyptian Arabic name لوف ''lūf''.〔The plant name "Luffa" was introduced to Western botany nomenclature by the botanist Johann Vesling (died 1649), who visited Egypt in the late 1620s and described the plant under cultivation with artificial irrigation in Egypt. In 1706 the botanist Joseph Pitton de Tournefort introduced the formal botany genus name "Luffa". Tournefort referred to Veslingius's earlier description and reiterated that "Luffa Arabum" is a plant from Egypt in the cucumber family. In establishing the ''Luffa'' genus, Tournefort identified just one member species and called it "Luffa Arabum". His 1706 article includes detailed drawings of this species (which is now called ''Luffa aegyptiaca'') – (Ref ). The species is native to tropical Asia but has been under cultivation in Egypt since late medieval times. The botanist Peter Forsskål visited Egypt in the early 1760s and noted that it was called لوف ''lūf'' in Arabic – (Ref ). In the 18th century the botanist Linnaeus adopted the name ''luffa'' for this species but assigned it to the ''Momordica'' genus, and did not use a separate ''Luffa'' genus. More refs on ''Luffa'' in 18th century botany nomenclature: ("A commentary on Loureiro's "Flora Cochinchinensis" " ), by E.D. Merrill, year 1935, in ''Transactions of American Philosophical Society'' volume 24 part 2, page 377-378. (''Luffa'' @ ATILF ) and ("''Suite de l'Etablissement de Quelques Nouveaux Genres de Plantes''" ), by J.P. de Tournefort (1706) in ''Mémoires de l'Academe Royale des Sciences année 1706''.〕
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