The New Zealand Plant Conservation Network

Species

Juglans ailantifolia

Common Name(s)

Japanese walnut

Family

Juglandaceae

Flora Category

Vascular - Exotic

Structural Class

Dicotyledonous Trees & Shrubs

Habitat

Terrestrial.

Features

Widespreading tree to around 15m high. Shoots with glandular hairs; leaf scars not prominent. Buds brown-tomentulose. Leaves to approx. 60cm long; petiole and rachis to about 40cm long, densely clothed in glandular hairs. Leaflets 9~17, sessile or nearly so, becoming glabrous or nearly so above, densely hairy with simple and stellate hairs on the veins beneath and midrib glandular, serrulate with teeth often sparse; base obliquely truncate or subcordate; apex acute to acuminate; lowest pair of leaflets often smaller; terminal leaflet mostly of similar size to lateral leaflets. Lamina of terminal leaflet 6~18 x 3~8cm, oblong or oblong-ovate. Male catkins to around 15cm long, with glandular hairs. Female catkins 9~22-flowered, generally tomentose with purplish glandular hairs; stigmas 6~7mm long, prominent, pink. Fruit 2.5~4cm long, broad ovoid, beaked, viscid, tomentose, ferrugineus. Shell rugose, thick, usually subcordate at base; sutures thick and raised, dividing with difficulty; beak often sharply acute. Seed convoluted. (- Webb et. al., 1988)

Flowering

October, November

Flower Colours

Red / Pink,Violet / Purple

Year Naturalised

1983

Origin

Japan

This page last updated on 18 Jan 2010