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Ipomoea simplex
''Ipomoea simplex'' is a central and eastern Southern African grassland species of Convolvulaceae or Sweet Potato family, notable for its large tuber or root, often eaten raw by Xhosa and Sotho herd boys.〔''Medicinal and Poisonous Plants of Southern and Eastern Africa'' - Watt and Breyer-Brandwijk (E&S Livingstone 1962)〕 Carl Peter Thunberg first described this species in the ''Prodromus Plantarum Capensium'' of 1794. 'Ipomoea' = 'worm-like', in reference to the twining habit of the genus.
The Earl of Derby presented Kew Gardens with a ''"rounded uncouth-looking tuber"'' in 1844, having acquired it from the Eastern Cape, and all were completely unprepared for the beauty of its flowers that appeared in July of 1845. After flowering, the stems died down nearly to the tuber. The following description is taken verbatim from the plant's appearance in ''Curtis's Botanical Magazine'' of 1846:
Edwin Percy Phillips in his survey of the (''Flora of the Leribe Plateau and environs'' ) in the ''Annals of the South African Museum'' notes that ''Ipomoea simplex'' grows in localities with sparse and uncertain rainfall, prone to fire in the dry season, harsh winter conditions, in the company of other plants with long taproots, thick tuberous roots and underground woody stems, all adaptations to the demands of their habitat. Franz Seiner came across the plant in the sands of the mid-Kalahari.〔http://www.biodiversitylibrary.org/item/708#page/3/mode/1up〕
==References==
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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