Diervilla
Diervilla, or bush honeysuckle, is a genus of three species of deciduous shrubs in the family Caprifoliaceae, all indigenous to eastern North America. The genus is named after a French surgeon Dr. Marin Diereville, who introduced the plant to Europe around 1700. The bush honeysuckles are low in height (1–2 m), of small to medium diameter (1–2 m), and develop into colonies by means of spreading underground rhizomes. Their leaves are simple, opposite and either oval or lanceolate in shape with a toothed edge. The fall color varies between yellow, orange and red. Small tubular flowers, typically pale yellow , are produced in June and July. Species. Other species formerly included in "Diervilla" are now treated in the genus "Weigela". The bush honeysuckles are commonly confused with the common wild honeysuckle ("Lonicera tatarica"), or the Japanese honeysuckle ("Lonicera japonica"), both members of the closely related genus "Lonicera". The British "Diervilla" national collection is held at Sheffield Botanical Gardens; along with the national collection of the closely related genus "Weigela". "Diervilla" species are used as food plants by the larvae of some Lepidoptera species including the common emerald and the engrailed moths.