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Trees. Leaves 1-foliolate, petiolate, thickened at basal end; petiolules very short, wrinkled. Stipules minute, linear, caducous. Inflorescences axillary, fascicled short thyrses. Stamens 5(-7), all fertile, rarely 1-3 smaller; filaments free; anthers basifixed, uniform, ovoid, dehiscing lengthwise. Ovary stipitate, terete or slightly ellipsoid, slightly hairy, 1-ovuled; style filiform, slightly hairy; stigma obscure.


West Malesia present
Only 1 species known, in West Malesia.


The present genus was reduced to Dialium as a subgenus by Steyaert (l.c.). Rojo (l.c.), after a comprehensive study of the genus Dialium, excluded the genus Uittienia from Dialium and reinstated it as a monotypic genus within the same subtribe (i.e. tribe Cassieae subtribe Dialiinae Irwin & Barneby).

According to Rojo (l.c.: 100) the fruit of Dialium "has a thin crustaceous exocarp which is usually hairy and easily crushed or sometimes detached from the adjacent meso- carp," while the fruit of Uittienia "does not have a crustaceous exocarp but instead has a thick (c. 4-5 mm) and hard pericarp which when dry is uncrushable by hardest press between two hands." See Rojo's figures 2.18b and 3.1 f/g.


Watson & Dallwitz 1983: Gen. Leg.-Caesalp. p 58
Hutch. 1964: Gen. Flow. pl. p 237
Rojo 1982: Unpubl. Thesis Oxford. 99, 248
Irwin & Barneby 1981 – In: Polhill & Raven, Adv. Leg. Syst. 1. p 101