Commemorating N. Dierville, a French surgeon who transported Diervilla lonicera to Europe in the 18th century.
Low, deciduous shrubs. Leaves simple, without stipules and more or less stalkless. Flowers tubular, in axillary or terminal clusters on new wood, 2-lipped, yellow; summer. Stamens 5, protruding. Ovary with 2 chambers. Fruit a thin-walled capsule containing numerous wingless seeds.
Weigela and Diervilla are rather similar and were once in the same genus. Weigela is from E North America while Diervilla, which differs in having 2-lipped yellow flowers on the current season's growth, is from E Asia.
Softwood and semi-hardwood cuttings.
Flowers yellow, 2-lipped, cf. Weigela.
2-3 species from E North America.
Source: (2002). Caprifoliaceae. In: . Horticultural Flora of South-eastern Australia. Volume 4. Flowering plants. Dicotyledons. Part 3. The identification of garden and cultivated plants. University of New South Wales Press.