Juglans regia L.

Habit

Tree

Family Description

Monoecious rarely dioecious trees. Leaves deciduous, alternate, even or odd-pinnate, exstipulate. Flowers unisexual, male flowers in pendulous catkins, perianth 3-6 lobed, adnate to bract, stamens 6-40; female flowers in catkins or short racemes, perianth of 4 segments borne on lobed bract or within involucre; ovary inferior, 1-locular, style 2-branched, ovule 1, basal. Fruit large drupe or winged nut.

Genus Description

Monoecious trees. Leaves odd-pinnate. Male flowers in simple,raceme-like catkins. Female flowers 1-3 in short terminal racemes, each with 4 lanceolates perianth segments adnate to brownish tomentose 4- toothed involucre, style branches plumose. Fruit an ovoid drupe, fleshy outside, hard shelled within, cotyledons lobed and folded.

Species description

Tree 6-25m.Leaflets in 2-5 pairs, oblong-lanceolate, 5-15 x 2.5-7cm,acuminate, base obliquely rounded, margins entire, glabrous expert for tufts of whitish hairs in vein axils beneath. Male catkins 7-15cm, each flower composed of 10-40 sessiles anthers on short side branch 3-8mm. Fruit 4-5 x 3-4cm.