GLI ALBERI TROPICALI DI GIARDINI NAXOS The Blue Jacaranda, Jacaranda mimosifolia more often known simply as the Jacaranda, is a sub-tropical tree native to South America that has been widely planted elsewhere because of its beautiful and long-lasting blue flowers. Older sources give it the systematic name Jacaranda acutifolia, but it is nowadays more usually classified as Jacaranda mimosifolia. It is also known as the Black Poui, or as the fern tree. In scientific usage, the name Jacaranda refers to the genus Jacaranda, which has many other members, but in horticultural and everyday usage, it nearly always means the Blue Jacaranda.The Blue Jacaranda has been cultivated in almost every part of the world where there is no risk of frost; established trees can however tolerate brief spells of temperatures down to around −7°C (20°F). In the United States, it grows in parts of Oregon, California, Nevada, Arizona, Texas, and Florida., and has been reported to grow in Lafayette, southern Louisiana, the Mediterranean coast of Spain, in southern Portugal (very noticeably in Lisbon), southern Italy (in Naples there are beautiful specimens). It is regarded as an invasive species in South Africa and Queensland, Australia, the latter of which has had problems with the Blue Jacaranda preventing growth of native species. Lusaka, the capital of Zambia also sees the growth of many Jacarandas.The tree grows to a height of 5 to 15 metres. Its bark is thin and grey-brown in colour, smooth when the tree is young though it eventually becomes finely scaly. The twigs are slender and slightly zigzag; they are a light reddish-brown in colour. The flowers are up to 5 cm long, and are grouped in 30 cm panicles. They appear in spring and early summer, and last for up to two months. They are followed by woody seed pods, about 5 cm in diameter, which contain numerous winged seeds. The Blue Jacaranda is cultivated even in areas where it rarely blooms, for the sake of its large compound leaves. These are up to 45 cm long and bi-pinnately compound, with leaflets little more than 1 cm long.Jacaranda is a genus of 49 species of flowering plants in the family Bignoniaceae, native to tropical and subtropical regions of South America (especially Brazil), Central America, Mexico, and the Caribbean. The genus name is also used as the common name.The species are shrubs to large trees ranging in size from 2 to 30 m (6.6 to 98 ft) tall. The leaves are bipinnate in most species, pinnate or simple in a few species. The flowers are produced in conspicuous large panicles, each flower with a five-lobed blue to purple-blue corolla; a few species have white flowers. The fruit is an oblong to oval flattened capsule containing numerous slender seeds. The genus differs from other genera in the Bignoniaceae in having a staminode that is longer than the stamens, tricolpate pollen, and a chromosome number of 18. Jacaranda mimosifolia chiamata volgarmente Jacaranda o Jacaranda Blu è una pianta appartenente alla famiglia delle Bignoniaceae, originaria del Sud America.La pianta ha le dimensioni di un albero di medie dimensioni con tronco e rami fortemente ramificati e spesso contorti, con corteccia scura, molto rugosa e fessurata. Le foglie sono molto grandi, (20-30 cm) multipennate. I fiori sono tubulari-campanuliformi (a forma di campanella allungata e curvata), di colore celeste-blu, raccolti in gruppi molto decorativi alla estremità dei rami. La fioritura è precoce, allinizio della stagione calda, ed interessa gran parte della chioma, in assenza o quasi delle foglie.La specie è originaria di Argentina e Bolivia.Albero alto fino ai 10-12 m originario dell’America meridionale; al genere jacaranda appartengono circa cinquanta alberi o arbusti originari dell’America centrale e meridionale, molti coltivati in Australia. Ha portamento eretto, con chioma densa e tondeggiante, larga quanto l’altezza dell’albero; la corteccia è scura e liscia; le foglie sono di colore verde brillante, bipinnate, simili a quelle della mimosa. In primavera inoltrata produce moltissimi grappoli apicali costituiti da fiori a trombetta, lunghi circa 5-6 cm, di colore blu-viola, che donano alla pianta un aspetto molto decorativo. In autunno produce lunghi baccelli cuoiosi che contengono numerosi semi scuri.In Italia é comune nei parchi e nei viali delle città costiere.
Posted on: Sat, 24 Jan 2015 19:40:14 +0000
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