Tree to 26 m tall; trunk buttressed and fluted, to 75 cm d.b.h.; wood durable; bark thin; branchlets acutely tetragonal varying to terete or compressed, grayish or brunneous, glabrescent densely fulvous puberulent when young. Leaves 3-folio-late; leaflets unequal in size, the lateral pair much smaller, thin-chartaceous or submembranous, the central leaflet broadly elliptic, 4.5-22 cm long and 2.5-10.5 cm wide, entire, apically rounded and short-acuminate or abruptly acuminate, the tip obtuse and apiculate, basally acute to acuminate, dark-or bright-green above, lighter beneath, shiny, glabrous above, finely puberulent beneath when young, especially on the larger venation, glabrescent, the lateral leaflets similar but smaller and narrower, petioles 1.3-9.5 cm long, finely appressed-puberulent, petio-lules 1-8 mm long, the central one longest, stout, finely puberulent, flattened, and decidedly margined. Inflorescences axillary, solitary, cymose, blooming after the leaves have matured, 3.5-14 cm long and 4-6 cm wide, ca. 4 times dichotomously branched, many-flowered, usually loose and divergent, finely puberulent through-out; peduncles conspicuously flattened, 4.5-7.5 cm long; pedicels slender, 1-3 mm long; foliaceous bracts few, ca. 1.5 cm long and 4 mm wide, simple, long-stipitate; bractlets and prophylls linear, 1-3 mm long. Flowers fragrant, corolla blue or lavender.
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