Lonicera involucrata is a distinct shrub growing in the Lonicera Collection.
One of 180 species this deciduous North American species is commonly referred to as Californian honeysuckle, or twinberry. It is a large shrub reaching 2m in height and 2m in width, and bears stout shoots, and paired ovate to lanceolate leaves whose margins are hairy. The deep-yellow, tubular, hairy flowers are borne in pairs in the leaf axils, and are held in large, hairy bracts which are green on emergence, but which quickly take on a deep red colouring. Lonicera involucrata produces pairs of glossy black fruits which will persist well into autumn. In its native range L. involucrata grows in moisture retentive, sandy soils at altitudes up to 2900m above sea level.