PNGTreesKey – Engelhardtia rigida Blume


Barry Conn (NSW) & Kipiro Damas (LAE).
Guide to trees of Papua New Guinea
Copyright held by the authors, National Herbarium of New South Wales, and Papua New Guinea National Herbarium

Engelhardtia rigida Blume

Flora van Nederlandsch Indië 528

Family: Juglandaceae

Timber Group: Occasional timber species

Field Characters: Large canopy tree (10-35 m high, sometimes up to 50 m); Bole cylindrical (up to 150 cm diam.); straight (bole c. 25 m high); buttresses buttresses present; spines spines absent; aerial roots aerial roots absent; stilt roots stilt roots absent; Bark grey or brown, rough, scaly or flaky or pustular, lenticels elongated vertically; Subrhytidome (under-bark) red or brown; less than 25 mm thick, 10.0; bark blaze consisting of one layer; faintly to non-aromatic; pleasant; outer blaze red or brown, with stripes, fibrous; inner blaze red or brown, with stripes, fibrous; bark exudate (sap) absent; terminal buds not enclosed by leaves.

Indumentum: Complex hairs absent; stinging hairs absent; mature twig indumentum (hairs) absent.

Leaves: Leaves spaced along branches, spiral (leaves occurring singly at a node and arranged spirally up the branchlet), compound (a leaf made up from two or more leaflets); petiole present (8 mm long), not winged, attached to base of leaf blade, not swollen or swollen (slightly at base); leaves with three leaflets (trifoliate); petiolule not swollen; leaves with a terminal leaflet (the number of leaflets odd - imparipinnate), broadest above middle, broadest at or near middle, or sometimes broadest below middle, 4.5-8.0 cm, 2.5-4.0 cm, leaflets arranged from one point, symmetric, terminal developing leaflet buds straight; venation pinnate, secondary veins open, prominent, intramarginal veins absent; leaves lower surface pale green or green, upper surface dark green, pale green, or green, indumentum (hairs) absent; absent; domatia absent; stipules absent.

Flowers: Inflorescence leaf-opposed, flowers on an unbranched axis, cones absent; flowers bisexual, not stalked, flowers with one plane of symmetry, 25.0 mm long, diameter large (more than10 mm diam.) (12 mm diam.); perianth present, with distinct sepals and petals whorls, inner perianth white or pale green; 4, free; stamens (3-) (male flowers) 4-6 (-8), absent, free of each other, free of the perianth; ovary inferior (female flowers), carpels joined (when more than one), locules 1 (because incomplete septum separating 2 locules); styles free, 3.

Fruits: Infrutescence arranged on unbranched axis, fruit ca 3.0 mm long, brown (fused with base of wing-like bract), not spiny, non-fleshy, simple, indehiscent, nut; seeds 1, barely visible (to 1 mm long) (1-2 mm long), not winged, broad (as wide as long), seed 1-10 mm diam. (c. 1 mm diam.).

Distribution: West Sepik, East Sepik, Madang, Morobe, Western Highlands, Eastern Highlands, Southern Highlands, Western, Gulf, Central, Northern, Milne Bay & Papuan Islands.

Engelhardtia rigida
Botanical records
in PNGplants database

Map details