Scientific Name:
Juglans ailantifolia Carrière (1878)
Vernacular Name(s):
Japanese walnut

Widespreading tree to c. 15 m high. Shoots with glandular hairs; lf scars not prominent. Buds brown-tomentulose. Lvs to c. 60 cm long; petiole and rachis to c. 40 cm 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 × 3–8 cm, oblong or oblong-ovate. ♂ catkins to c. 15 cm long, with glandular hairs. ♀ catkins 9–22-flowered, ± tomentose with purplish glandular hairs; stigmas 6–7 mm long, prominent, pink. Fr. 2.5–4 cm long, broad-ovoid, beaked, viscid, tomentose, ferrugineus. Shell rugose, thick, ± subcordate at base; sutures thick and raised, dividing with difficulty; beak often sharply acute. Seed convoluted.

[From: Webb et al. (1988) Flora of New Zealand. Volume 4.]

Number of subspecific taxa in New Zealand within Juglans ailantifolia Carrière
Exotic: Fully Naturalised1

Flowering: Oct.–Nov.

Biosecurity New Zealand 2012: Regional Pest Management Strategies Database.
Howell, C. 2008: Consolidated list of environmental weeds in New Zealand. DOC Research & Development Series 292: 42.
Ministry for Primary Industries 23 Feb 2017: Unwanted Organisms Register. Version 02.01.02.