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''Zantedeschia'' 〔''Sunset Western Garden Book,'' 1995:606–607〕 is a genus of eight species of herbaceous perennial flowering plants in the family Araceae, native to southern Africa from South Africa north to Malawi. The genus has been introduced on all continents except Antarctica. Common names include arum lily for ''Z. aethiopica'', calla, and calla lily for ''Z. elliottiana'' and ''Z. rehmannii'' although it is neither a true lily (Liliaceae), nor an ''Arum'' or a ''Calla'' (related genera in Araceae). The colourful flowers and leaves are highly valued, and both species and cultivars are widely used as ornamental plants. == Description == ''Zantedeschia'' species are rhizomatous herbaceous perennial plants with some species (''Zantedeschia aethiopica'') growing to 1.2m tall, while ''Zantedeschia rehmannii'' does not exceed 60 cm in height, growing in clumps or clusters.〔 Roots: Contractile, emerging from the top of the tubers in Group II.〔 Stem: The underground portion is variously described as a thick underground stem (rhizomes or tubers).〔 While the literature is confusing as to the exact terminology, generally the ''Zantedeschia aethiopica''-''Zantedeschia odorata'' group (Group I) is referred to as having rhizomes, and the remaining species tubers.〔 The rhizomes are fleshy and branched.〔 Leaves: Petioles are long, spongy in nature, sheathed at the base and of varying length from 15 cm (''Zantedeschia rehmannii'') to 1.5 m (''Zantedeschia aethiopica'') in length. The lamina is simple, elongated and coriaceous with a variety of shapes, including triangular, oval (ovate) with or without a point (elliptic), heart (cordate), spear (hastate), lance (lanceolate), oblong, or circular (orbicular). 15–60 cm in length, 5–25 cm in width. The leaves are dark green in colour and feather-veined (pinnate), and may be erect or spreading with undulate margins. Some species exhibit transparent flecking (maculation), and are therefore referred to as maculate, while others are immaculate. (see Table I, also New Zealand Calla Council Leaf Shape Images〔(New Zealand Calla Council Leaf Shape Images: (a) lanceolate, (b) ovate, (c) triangular, (d) hastate. Heavy maculation is also present in (c) and (d) and medium maculation in (b). )〕)〔〔〔 The leaves contain hydathodes that result in guttation.〔〔 Inflorescence: Takes the form of a solitary pseudanthium (false flower), with a showy white or yellow spathe (a specialised petal like bract) shaped like a funnel with a yellow, central, finger-like spadix, which carries the true flowers. Both spathe and spadix are carried on or above the leaves on the fleshy flower stem. The shape of the spathe whose overlapping margins form the tubes varies from trumpet shaped (''Z. pentlandii'') to a tight tube with a tapering tip (''Z. rehmannii''). The spathe is initially green, but as it unfolds becomes coloured. This may be white as in ''Z. aethiopica'', but other species include yellow and pink. Cultivars have a wide variety of other spathe colours including orange and purple. Inside the spathe, the throat may be darkly coloured.〔〔Botanicas Annuals & Perennils, Random House, Sydney, 2005, ISBN 0-09-183809-6 pp. 938〕 The spathe acts to attract pollinators. Flowers: Zantedeschia is monoecious in which separate male (staminate) and female (pistillate) flowers (''imperfect'' or ''unisexual'' flowers) are carried on the spadix. The flowers are small and non-blooming with an absent perianth. The male flowers contain two to three stamens fused to form a synandrium, and the female flowers have a single compound pistil with three fused carpels and three locules.〔〔〔 Fruit: Beaked orange or red berries.〔 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「Zantedeschia」の詳細全文を読む スポンサード リンク
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