Aporosa tetrapleura

A. tetrapleura is in a clade with sisters Aporosa ficifolia, A. octandra, A. planchoniana, and A. villosa, separated from other species within the Appendiculatae section of the Aporosa genus.^[2]

The species was first described by Henry Fletcher Hance (1827-86), an English diplomat and botanist, who worked in Zhōngguó/China from 1844 to his death. He published the description in 1876 in the Journal of Botany, British and Foreign.^[3]

A. tetrapleura is a tree, usually small, but up to 12m in height, with a trunk some 10cm in diameter^[4] The petioles are some 9 to 21mm long. The leaves have large black basal glands; a (narrowly) elliptic leather and shiny blade, which when dry is often rather brittle; an acute to acuminate apex; and 6 to 8 pairs of nerves. Inflorescences occur axillary or just below the leaves. Laxly set flowers with 4 sepals and 2 stamens in the staminate flowers. The fruit are 11 to 14mm long, they are not stiped, and only the immature fruit are beaked, at the sutures there is ridging; the pericarp is 0.5-1.55mm thick. Flowering occurs in April and December, fruiting in March and June.

The species is found in Cambodia and in south and central Vietnam.^[1]

The tree occurs in forests, favouring granitic soils at about 300m altitude.^[4]

The primary forest adjacent to Khe Tran village (Phong Mỹ commune, Thừa Thiên Huế Province, central Vietnam) have Adinandra cf. hainanensis (Theaceae), A. tetrapleura and Aporosa octandra as the most abundant species.^[5]

A long mom pu xá, a long môt, mom are names used by Pahy and Vietnamese language speakers at Khe Tran village, Vietnam.^[5]