The Algerian ash is a medium-sized, deciduous tree growing to 20–30m tall with a trunk up to 1.5m in diameter. It is not commonly planted anymore, however large numbers of adult trees can still be seen growing in suburban areas. The flowers are produced in inflorescences, which can be male, hermaphrodite or mixed male and hermaphrodite. Flowering occurs in early spring.
Deciduous tree 10 to 20 m high with a spreading crown and often more than one trunk; bark is greenish smooth at first, aging to brown and rough. Leaves bright green, paler and sometimes densely hairy beneath, turning yellow in autumn; 3 – 9 pinnate, but mostly with 5 leaflets; leaflets coarsely toothed, 50 – 100 mm long.
This fast-growing species is particularly invasive along waterways (i.e. in riparian areas) and in sheltered forests in temperate zones, but it has the potential to invade other habitats.
A deciduous tree up to 12m high, exceptionally 25m, with an oval or rounded crown and bark that is dark brown and deeply furrowed. It suckers freely and often forms thickets. Young stems and branchlets have short spines. Small, bright green leaves above and paler beneath which become yellow in autumn. White, fragrant flowers in drooping sprays from September to November. Reddish-brown pods. The seeds, leaves and inner bark are poisonous seeds.
Deciduous or semi-evergreen shrub 3-6m high. Mid to dark green leaves, sometimes variegated, or yellow. The shoots and leaves are smooth and white, heavily scented flowers appear in terminal clusters from October to February followed by tiny black berries. The leaves and fruit are poisonous to humans and certain animals.
It is an upright, straggly, woody deciduous or semi-evergreen shrub 2–3 meters (6 ft 7 in–9 ft 10 in) tall with one or more brittle green stems. Light green leaves are alternate and shiny green to 12 cm (5 in) long, giving off a foul rubbery smell when crushed. It has sprays of small, fragrant, tubular yellow-green flowers approximately 2.5 cm long on the ends of the stems, flowering from late spring to autumn. These produce clusters of small, black egg shaped berries during summer to autumn.