An evergreen shrub of loose, erect habit, 4 to 8 ft high; young shoots ribbed, not downy, armed with three-forked spines 1⁄4 to 5⁄8 in. long. Leaves arranged in clusters of three to six at each joint, linear, spine-tipped, tapered towards both ends, toothless; 3⁄4 to 13⁄4 in. long, 1⁄4 in. or less wide; dark shining green above, glaucous beneath, of leathery texture, scarcely stalked; margins recurved. Flowers clustered at the joints, four to six together, each on its own very slender red stalk 1⁄2 to 11⁄4 in. long; they are of a rich orange colour internally and of a beautiful apricot colour outside, and measure about 5⁄8 to 3⁄4 in. across when open. Fruit black, covered with a blue bloom, egg-shaped, 1⁄2 in. long, terminated by the conspicuous style. Bot. Mag., t. 9526.
Native of Chile; described by Philippi in 1856; introduced in 1927 by H. F. Comber, who found it at 3,400 ft altitude in shady moist woodland. Comber notes that it is ‘one of the best’, and, judging by small plants that flowered in less than three years from sowing the seed, that is a true estimate of its quality. The flowers are larger than those of B. darwinii and more richly coloured. It is of course very distinct from that barberry in its long, narrow, entire leaves. It appears to be very hardy, as two-year-old plants withstood the cold winter of 1928-9 out-of-doors at Kew without suffering in the least and flowered freely in April 1930. Clarence Elliott, who has seen it wild during his visits to Chile, speaks highly of its beauty. It seems remarkable that so excellent a shrub should have been overlooked so long, but I cannot find that it has been in cultivation before. A fine form was shown at the Horticultural Hall on 21st April 1931, by Lt-Col. Messel from his garden at Nymans and was given a First Class Certificate. It showed this species, both in the size and rich colour of its blooms, to be probably the finest of all the evergreen true barberries.
To the above account, first published in 1933, it is only necessary to add that in most gardens B. linearifolia came through the hard winters of the early sixties with little damage, and seems hardy enough in a position sheltered from cold, drying winds. It is tolerant of chalky soils.
B. × lologensis Sandw. – A group-name for hybrids between B. darwinii and B. linearifolia. Comber found three plants near Lake Lolog in Argentina in 1927, growing with the parents, and introduced seed. The type is intermediate between the parents but favours darwinii more in foliage; the flowers are larger than in that species and have inherited some of the fine colouring of linearifolia. There appear to be forms intermediate between the type and both of the parents, judging from plants raised from Comber’s seed. A selected form, raised by the late Sir Frederick Stern, is in commerce as ‘Highdown’. He found that this hybrid, like B. linearifolia, grows well on chalk.