Great British Trees - identification and genetics

In this category, there are multiple oval leaflets, arranged in pairs on a single stalk (i.e. “pinnate”), with one more leaflet at the top of the stalk.

Examples include:

Common ash (Fraxinus excelsior)

Up to 6 pairs of leaflets.

Its seeds are contained in drooping clusters of elongated, winged “keys”

Rowan. (Mountain ash; Sorbus aucuparia)

6-7 pairs

Leaf edges more serrated than those of ash. Orange berries rather than the dropping clusters of winged “keys” seen in the common ash.

Elder (Sambucus nigra)

Two or three pairs of leaflets with one at end of stem (i.e. 5 or 7 leaflets in total). Grows as a shrub or small tree with multiple stems/trunks.

Oval/elliptical leaves with point