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Tieghemopanax (family Araliaceae) A genus of trees and shrubs with alternate, pinnate leaves which are almost or completely sessile, and often toothed. The flowers are regular, small, and unisexual, held in umbels. The calyx is very small, often without distinct teeth. There are 5 petals, occasionally only 4, and the same number of stamens. The ovary is of 5 fused carpels. The fruit is a drupe with 5 seeds. There are 35 species, found only in Australia and Vanuatu.