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(Prickly Thrift. Nat. Ord. Plumbaginaceae). These plants form dense tufts of evergreen spiny foliage. About eight species are in cultivation. All are rock plants, and do best in sunny well-drained positions or on rocky ledges. They are propagated by layering in summer, also by cuttings in July. We describe the four best below : Acantholimon acerosum.Cushionlike tufts of stiff glaucous leaves with sharp points. Flowers rosecoloured in short racemes. Site warm, sunny, rocky crevices. Flowering Period, July. Height, 4 ins. A. androsaceum.Tufts of very short spiny glaucous leaves. Flowers crimson-purple. Site warm, sunny.