Zanthoxylum thorncroftii (I.Verd.) P.G.Waterman

Branches glabrous, armed with straight spines 4-6 mm long; bark dark brown. Leaves petioled, 3-5-jugate, 3-5 cm long; petiole 3-5 mm long, channelled on the upper surface, pubescent; rachis channelled and slightly pubescent above, usually glabrous beneath; leaflets sessile, 0.6-3 cm long, 0.4-2 cm broad, obliquely elliptic, mostly subacuminate, usually retuse at the apex, rounded or slightly narrowed at the base and usually eared, glabrous, with a prominent mid-rib beneath, distinct above, and 3-7 lateral veins, slightly darker on the upper surface; margins serrated with a single gland at the base of each sinus; terminal leaflet obovate. Inflorescence an axillary or terminal panicle bearing male and female flowers; peduncle and branches minutely pubescent and with the peduncle much longer than the petiole of the subtending leaf. Flowers unisexual. Sepals 1.5 mm long, elliptic, obtuse, ciliated. Petals 3.5 mm long, elliptic, obtuse. Stamens absent or rudimentary in female flowers. In male flowers filaments 3 mm long, linear; anthers globose. Ovary rudimentary in male flowers. In female flowers 3 mm long, globose, hardly unequal-sided, uni-locular, 2-ovuled, glandular; style 1 mm long, terete, stigma capitate. Fruit not seen.