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Angraecum
The genus ''Angraecum'', abbreviated as Angcm in horticultural trade, common name Angrek (Indonesian and Malay) or Comet Orchid, contains about 220 species.
== Description ==
They are quite varied vegetatively and florally and are adapted to dry tropical woodland habitat and have quite fleshy leaves as a consequence. Most are epiphytes, but a few are lithophytes.
The long-lasting flowers are racemose and grow from the leaf axils. They are mostly white, but a few are yellow, green or ochre. They all have a long spur at the back of the labellum (lip).
In the case of ''Angraecum sesquipedale'', a species from Madagascar, on observing the 30 cm spur in the lip, Charles Darwin made the hypothesis that, since the nectar was at the bottom of the spur, a pollinator must exist with a tongue at least that long. Otherwise the orchid could never be pollinated. At the time, he was not believed. However, in 1903, the predicted pollinator was discovered, a hawk moth then named ''Xanthopan morganii praedicta'' ("praedicta" meaning "the predicted one"). It has an appropriately long proboscis. The specific name ''sesquipedale'' means "one foot and a half", referring to the length of the spur. This is a perfect example of mutual dependence of an orchid and a specific pollinator.
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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