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Grevillea robusta : ウィキペディア英語版 | Grevillea robusta
''Grevillea robusta'', commonly known as the southern silky oak or silky oak, or Australian silver oak, is the largest species in the genus ''Grevillea'' of the family Proteaceae. It is not closely related to the true oaks, ''Quercus''. It is a native of eastern coastal Australia, in riverine, subtropical and dry rainforest environments receiving more than 1,000 mm per year of average rainfall. ==Description== It is a fast-growing evergreen tree, between tall, with dark green delicately dented bipinnatifid leaves reminiscent of a fern frond. It is the largest plant in the Grevillea genus, reaching trunk diameters in excess of . The leaves are generally long with greyish white or rusty undersides. Its flowers are golden-orange bottlebrush-like blooms, between long, in the spring, on a 2–3 cm long stem and are used for honey production. Like others of its genus, the flowers have no petals, instead they have a long calyx that splits into 4 lobes. The seeds mature in late winter to early spring, fruiting on dark brown leathery dehiscent follicles, about 2 cm long, with one or two flat, winged seeds.
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