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''Ravenea'' (Majesty Palm) is a genus of 20 known species of palms, all native to Madagascar and the Comoros.〔(Kew World Checklist of Selected Plant Families )〕 They are small to large palms, with solitary, robust grey stems, swollen at base and gradually tapering upward. The species vary greatly in size, with ''R. hildebrandtii'' and ''R. nana'' only reaching 4 m, while ''R. robustior'' and ''R. sambiranensis'' both reach 30 m. The leaves are up to 2-5 m long, pinnately compound, reduplicate, erect at first then arching, twisted near the apex; with numerous crowded narrow ribbed leaflets. The inflorescence is short, borne among the leaves; the fruit is a red drupe.〔Govaerts, R. & Dransfield, J. (2005). World Checklist of Palms: 1-223. The Board of Trustees of the Royal Botanic Gardens, Kew. 〕 ;Species Several of the species are endangered, ''R. moorei'' critically so, with only two specimens known, these last seen in 1993 ((IUCN report )). ''R. louvelii'' is little better off, with fewer than 25 plants known ((IUCN report )). ==Cultivation and uses== ''Ravenea rivularis'' (Majesty Palm) is widely cultivated in subtropical regions. It is an adaptable palm that looks somewhat similar to the ever popular Queen palm. It is a very large palm with a large, untidy crown. It has symmetrical leaves and develops an attractive swollen base of the trunk. Majesty palm prefer full sun and plenty of water to ensure rapid growth. It is tolerant of different soil types. Propagation is by seeds, which germinate in 2–3 months. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ravenea」の詳細全文を読む スポンサード リンク
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