Woody climbers. Young branchlets pale reddish brown, glabrous. Stems, branches, and leaf rachises with prickles. Leaves 19-51-foliolate; leaflet blades subsessile, subopposite to alternate, lanceolate, elliptic, or ovate, asymmetric, 1.5-5 × 0.5-2 cm, oil glands numerous and pellucid, midvein puberulent when young and adaxially slightly ridged to plane, margin crenate, apex blunt, rounded, or mucronate with a blunt tip. Inflorescences axillary. Flowers 4(or 5)-merous. Perianth in 2 series. Sepals ovate, to 1 mm, apex blunt to rounded. Petals pale yellowish green, oblong, ca. 2 mm. Male flowers: stamens 4; anthers broadly ovate; connective with an oil gland at apex; rudimentary gynoecium long conic. Female flowers: pedicel 2-5 mm, to 1 cm in fruit. Fruit follicles brownish red, ca. 5 mm in diam., apex beaked. Seeds 4-4.5 mm in diam. Fl. May-Jun, fr. Oct-Nov.
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