Rowan, also known as Mountain Ash or European Rowan
Kingdom: Plantae, Division: Tracheophyta, Class: Magnoliopsida, Order: Rosales, Family: Rosaceae, Genus: Sorbus, Species: Sorbus aucuparia · Rosaceae (Rose family) · Pinnately compound leaf with typically 9 to 15 leaflets, deciduous
Species
Sorbus aucuparia
Leaf Type
Pinnately compound leaf with typically 9 to 15 leaflets, deciduous
Family
Rosaceae (Rose family)
Shape
Oblong to lanceolate leaflets with rounded to acute tips
Size
The entire compound leaf is approximately 6-8 inches long, with individual leaflets measuring about 1-2 inches in length, which is typical for this species
Margin
Serrate (sharply toothed) along most of the margin, occasionally entire near the base
Arrangement
Alternate arrangement on the twig
Rarity
Very Common
Color & Pattern
Bright medium green upper surface with a lighter green underside; the rachis (main leaf stem) shows a reddish-purple hue. Several small dark spots/blotches are visible across the leaflets, likely indicating minor fungal leaf spot or insect activity
Venation Pattern
Pinnate venation with a prominent central midrib and parallel lateral veins on each leaflet
Texture & Surface
Matte finish with a slightly soft texture, glabrous to slightly pubescent on the lower veins
Description
Sorbus aucuparia is a slender, deciduous tree growing up to 15 meters tall with a smooth grey bark when young. It produces flat-topped clusters of creamy-white flowers in spring, followed by heavy clusters of bright red or orange berries in autumn that are a favorite of birds. The foliage turns vibrant shades of yellow and red in the fall.
Key Features
Pinnately compound leaves with sharply toothed leaflets, smooth grey bark, reddish-purple leaf stalks, flat-topped white flower clusters, and bright red autumn berries
Habitat
Found in open woodlands, mountain slopes, rocky soils, and urban landscapes. It prefers moist, well-drained soils and acidic to neutral pH, thriving in full sun to partial shade
Geographic Range
Native to Europe and parts of Asia, extending from Iceland and the British Isles east to western Siberia and the Caucasus, and widely cultivated as an ornamental tree worldwide
Condition Notes
Fair condition; the leaf is structurally intact but exhibits numerous small dark spots characteristic of common fungal leaf blotch (such as Venturia aucupariae) or insect feeding, which is very typical for mature summer foliage
Interesting Facts
In European folklore, the Rowan tree was considered a powerful protective talisman against witchcraft and evil spirits. Its bright red berries contain high amounts of vitamin C and are famously used to make jellies for game dishes
Medicinal & Uses
Fruits are edible when cooked or processed into jellies, jams, and liqueurs, though astringent and tart when raw. Historically used in traditional medicine for respiratory ailments and as a diuretic. Highly valued as an ornamental garden tree for wildlife
Ecological Role
Provides a vital food source for numerous bird species, particularly thrushes and waxwings, which consume the berries and disperse the seeds. Flowers provide nectar and pollen for bees and other beneficial insects
Similar Species
Other Sorbus species such as Sorbus intermedia (Swedish whitebeam) which has simple lobed leaves rather than compound leaves, or Fraxinus (Ash) species which have opposite leaf arrangement compared to the alternate arrangement of Rowan
Foraging Tips
Look for slender trees with smooth grey bark and pinnately compound leaves featuring serrated edges in woodlands or urban parks. In late summer and autumn, look for the striking clusters of bright red berries
Toxicity Warning
Non-toxic. The raw berries contain parasorbic acid which can cause mild indigestion in large quantities, but cooking breaks this down, making them safe and palatable