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An evergreen, semi-shrubby plant, erect and 6 to 15 in. high, or sometimes procumbent; stems round, very slender and clustered, glabrous. Leaves in whorls of four, rarely three, linear, 1⁄3 to 1 in. long, 1⁄16 in. or less wide, stalkless, revolute, blunt; midrib prominent beneath. Flowers borne in axillary clusters of three to five, forming terminal panicles 2 to 5 in. long. Corolla 3⁄4 in. wide, glowing yellow; petals ovate-oblong; sepals linear-oblong, about 1⁄5 in. long, margined with dark, stalked or stalkless glands; stamens in three bundles. Blossoms in June and July. Bot. Mag., t. 6563.
Native mainly of the northern Appenines, Maritime Alps and southern Alps; cultivated in 1640. It is related to H. empetrifolium, which has angled stems and fewer, usually three, leaves in a whorl, and petals which fall before the fruits are ripe. H. coris is a lime-loving plant and needs a sunny position, in well-drained soil.