Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Lonicera caucasica' from the website Trees and Shrubs Online (treesandshrubsonline.
A deciduous shrub of bushy habit up to 8 or 9 ft high, rather more in diameter; winter-buds as in L. nigra; shoots quite glabrous. Leaves oval or ovate, broadly wedge-shaped or rounded at the base, pointed, 11⁄2 to 4 in. long, 1⁄4 to 11⁄2 in. wide, green above, greyish beneath, glabrous, or with a few scattered dull hairs beneath; stalk 1⁄4 in. or less long. Flowers borne during May and June in pairs from the leaf-axils of the current year’s shoots, pink, slightly fragrant, 1⁄2 in. long; corolla two-lipped; tube very short, much swollen on one side, downy within; stamens and style exposed, both downy; flower-stalk 1⁄2 to 3⁄4 in. long, glabrous. Fruits black, each pair wholly united by the inner edges.
Native of the Caucasus and Near East; introduced in 1825. It varies somewhat, and the description given above is of a cultivated plant. It is of no particular merit.
L. kesselringii Reg. L. savranica Spaeth; L. kamtschatica Hort.; L. orientalis var. longifolia Dipp. – Leaves oblong or oval-lanceolate 11⁄2 to 21⁄2 in. long, rarely more than 3⁄4 in. wide. Flowers pink, smaller than in L. caucasica, the corolla-tube only slightly swollen; common stalk 1⁄3 in. long. Of unknown origin. Introduced 1888.