Lonicera L.

Key to species

1 Terminal leaves ± fused; upper 2 leaves completely fused, forming a single elliptical shape around the branchlet 2

1 Leaves always free 3

2 Leaves coriaceous, glabrous, persistent. Flowers in sessile glomeruli on pair of upper leaves Lonicera implexa

2 Leaves soft, ± villous, deciduous. Flowers in glomeruli longly pedunculate on pair of upper leaves Lonicera etrusca

3 Shrubs climbing, sarmentose 4

3 Shrubs or small trees upright, not climbing nor sarmentose 5

4 Flowers grouped in large numbers (± 15-20) in glomeruli on long peduncle at the end of branchlets Lonicera periclymenum

4 Flowers in pairs on axil of leaves Lonicera biflora

5 Subshrub that rarely exceeds 1 m in height. Flowers tubular-campanulate, almost regular, with 5 equal petals Lonicera pyrenaica

5 Shrubs or small trees 1-10 m in height. Flowers tubuliform and divided into 2 lips; lower lip with 1 petal and upper lip with 4 6

6 Shrubs or small trees up to 10 m in height. Leaves ± ovate-orbicular. Ovaries close together but not fused 7

6 Shrublet or shrub up to 1.5(2) m in height. Leaves ± lanceolate. Ovaries very close together, often semifused Lonicera kabylica

7 Shrub also of good size, but very ramose, sometimes from the base; trunk slightly or not well defined. Flowers yellow or white-yellowish Lonicera nummulariifolia

7 Shrub or small tree that often has a well-defined trunk. Flowers white or pink-white Lonicera arborea