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Zantedeschia is a genus of eight species of herbaceous, perennial, flowering plants in the aroid family, Araceae, native to southern Africa (from South Africa northeast to Malawi). The genus has been introduced, in some form, on every continent (minus Antarctica). Common names include arum lily for Z. aethiopica, calla and calla lily for Z. elliottiana and Z. rehmannii. However, members of this genus are not true lilies (which belong to the family Liliaceae), and the genera Arum and Calla, although related, are distinct from Zantedeschia, despite visual similarities. The colourful flowers and leaves, of both species and cultivars, are greatly valued and commonly grown as ornamental and garden plants. Description Zantedeschia species are rhizomatous, herbaceous, perennial plants with some species, e. g., 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, i. e., a rhizome or tuber. While the literature is confusing as to the exact terminology, generally the Zantedeschia aethiopica-Zantedeschia odorata group (Group I) is considered to have rhizomes and the remaining species tubers. The rhizomes are fleshy and branched. Leaves: Petioles are long, spongy, sheathed at the bases, and of varying lengths, from 15 cm (Zantedeschia rehmannii) to 1.5 m (Zantedeschia aethiopica). The lamina is simple, elongated, and coriaceous with a variety of shapes, including triangular, oval (ovate), with or without a point (elliptic), heart-shaped (cordate), spear-shaped (hastate), lance-shaped (lanceolate), oblong, or circular (orbicular). 15–60 cm in length, 5–25 cm in width. The leaves are dark green in colour, feather-veined (pinnate), and may be erect or spreading with undulate margins. Some species exhibit transparent flecking (maculation), and are therefore described as maculate, while others are immaculate. (see Table I, also New Zealand Calla Council Leaf Shape Images) 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. 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 without a 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. Taxonomy Zantedeschia is the sole genus in the tribe Zantedeschieae in a 1997 classification of the Araceae. Species Eight species are currently recognized: Zantedeschia aethiopica (L.) Spreng. – giant white arum lily or common arum lily - South Africa, Eswatini, Lesotho Zantedeschia albomaculata (Hook.) Baill. – spotted arum lily - widespread from South Africa north to Nigeria and Tanzania Zantedeschia elliottiana (W.Watson) Engl. – yellow or golden arum lily - Mpumalanga Province of South Africa Zantedeschia jucunda Letty - Leolo Mountains of northern South Africa Zantedeschia odorata P.L.Perry - Western Cape Province Zantedeschia pentlandii (R.Whyte ex W.Watson) Wittm. - Mpumalanga Province of South Africa Zantedeschia rehmannii Engl. – pink arum lily - South Africa, Eswatini, Mozambique Zantedeschia valida (Letty) Y.Singh - KwaZulu-Natal Province of South Africa Etymology The name of the genus was given as a tribute to Italian botanist Giovanni Zantedeschi (1773–1846) by the German botanist Kurt Sprengel (1766–1833). Distribution and habitat All species are endemic to central and southern Africa, from Nigeria to Tanzania and South Africa. Z. aethiopica grows naturally in marshy areas and is only deciduous when water becomes scarce. It grows continuously when watered and fed regularly and can survive periods of minor frosts. Z. aethiopica is a very strong and sturdy plant, being able to grow in many soils and habitats, multiplying by rhizome-offsets; it is naturalised and regarded as a weed throughout much of the world. Z. odorata is a rare species, resembling Z. aethiopica, but deciduous and smelling like freesia, endemic to a few localities in South Africa. Z. albomaculata is a widespread and variable species, growing from South Africa north to Kenya, varying in shades of white to cream and pink to orange-shades. Z. jucunda and Z. pentlandii are rare species with large yellow showy flowers. Z. rehmannii is a pink-flowered species with sword shaped leaves. Z. elliotiana is known from horticultural sources only and is probably of hybrid origin. Introduction Zantedeschia was introduced to Europe in the seventeenth century as Z. aethiopica, and is now widely naturalised in Europe, North America, Central America, South America, Oceania, and Australasia. In many places it is considered a dangerous invasive species that displaces native vegetation. In the South-West of Western Australia, Z. aethiopica was introduced for horticulture, but has become a widespread and conspicuous weed of watercourses, heath, and wet pastures to the extent that it has been declared a pest in Western Australia and landowners must control it and attempts to sell plants must be reported. Zantedeschia in North America is primarily grown as ornamental cultivars in home gardens. Habitat Z. aethiopica grows naturally in marshy areas and is only deciduous when water becomes scarce. It grows continuously when watered and fed regularly and can survive periods of minor frosts. Z. aethiopica is a very strong and sturdy plant, being able to grow in many soils and habitats, multiplying by rhizome-offsets. Cultivation All Zantedeschia produce large, showy flowers spathes and are often grown both as ornamental plants and for cut flowers. Zantedeschia are relatively hardy plants, but some are more winter-hardy than others. In this regard there may be considered two groups, a hardy outdoor group with large white flowers (arum lilies) and less hardy group with white-spotted leaves and flowers in many colours (calla li.... Discover the Lily Zante popular books. Find the top 100 most popular Lily Zante books.