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Jacobaea maritima
''Jacobaea maritima'' (silver ragwort) (formerly known as ''Senecio cineraria'') is a perennial plant species in the genus ''Jacobaea'' in the family Asteraceae, native to the Mediterranean region. It was formerly placed in the genus ''Senecio'', and is still widely referred to as ''Senecio cineraria''; see the list of synonyms (right) for other names.
It is widely cultivated as an ornamental plant for its white, felt-like tomentose leaves; in horticultural use, it is also sometimes called dusty miller, a name shared with several other plants that also have silvery tomentose leaves; the two most often to share the name are ''Centaurea cineraria'' and ''Lychnis coronaria''.
==Description==
Silver Ragwort is a very white-wooly, heat and drought tolerant evergreen subshrub growing to tall. The stems are stiff and woody at the base, densely branched, and covered in long, matted grey-white to white hairs. The leaves are pinnate or pinnatifid, long and broad, stiff, with oblong and obtuse segments, and like the stems, covered with long, thinly to thickly matted with grey-white to white hairs; the lower leaves are petiolate and more deeply lobed, the upper leaves sessile and less lobed.
The tomentum is thickest on the underside of the leaves, and can become worn off on the upper side, leaving the top surface glabrous with age. The flowers are yellow, daisy-like in dense capitula diameter, with central disc florets surrounded by a ring of 10–13 ray florets, and enclosed in a common whorl of bracts at the base of the capitulum. The seeds are cylindrical achenes.〔Interactive Flora of NW Europe: (''Senecio cineraria'' )〕〔Blamey, M. & Grey-Wilson, C. (1989). ''Flora of Britain and Northern Europe''. ISBN 0-340-40170-2〕〔Huxley, A., ed. (1992). ''New RHS Dictionary of Gardening''. Macmillan ISBN 0-333-47494-5.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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