Botanical description
— Genus, Macadamia, F.v.M., in Trans. Phil. Inst., Vict. ii, 72.
Flowers. — Hermaphrodite.
Perianth. — Regular or slightly irregular, the tube opening earlier on the under side, and the segments, at least the lower ones, less revolute than in Helicia.
Anthers. — On short filaments inserted a little below the laminae, the connective produced into a gland or very short appendage.
Hypogynous glands. — Equal, distinct or united in a ring or cup round the ovary.
Ovary. — Sessile, with a long straight style, ovoid or clavate at the end, with a small terminal stigma; ovules 2, descending, laterally attached at or near the top.
Fruit. — Globular, indehiscent, with a hard thick putamen, and rather thin fleshy exocarp.
Seeds. — Either solitary and globular, or two and hemispherical; testa membranous.
Cotyledons. — Thick and fleshy.
Trees or tall shrubs.
Leaves. — Verticillate, entire, or serrate.
Flowers. — Pedicellate in pairs, in terminal or axillary simple racemes, the pedicels not connate.
Bracts. — Very deciduous.