溪桫 xi suo

Chisocheton balansae C. Candolle, Bull. Herb. Boissier 2: 578. 1894; C. paniculatus Hiern, nom. illeg. superfl.; Dysoxylum multijugum Arnott (1834), not C. multijugis C. Candolle (1910); Guarea paniculata Roxburgh (not before 14 Jan 1832), not Buchanan-Hamilton (1 Jan 1832).

Trees to 16 m tall. Young branches and inflorescences covered with brown trichomes. Leaves 30-100 cm or more, even-pinnate; leaflets 10-12 pairs; petiole and rachis covered with appressed trichomes; leaflet blades oblong to oblong-lanceolate, 13-30 × 4-6 cm, papery to leathery, both surfaces glabrous or abaxially appressed pubescent along veins, secondary veins 9-12(-15) on each side of midvein, abaxially conspicuously prominent and adaxially flat, base broadly oblique with one side cuneate and other side cuneate to rounded, apex acuminate. Thyrses axillary, usually as long as or longer than leaves, basally to 20 cm, sparsely branching, spreading, covered with short thick trichomes. Pedicel 3-5 mm, covered with brown tr i- chomes, with nodes below calyx. Calyx tubular, ca. 1.5 mm, outside puberulent or glabrous, truncate or inconspicuously 4-dentate. Petals 4, linear to spatulate, 1.4-1.8 cm × ca. 1.5 mm, narrowing toward base, glabrous except puberulent on apex, apex rounded or mucronate. Staminal tube long cylindric, outside apically densely puberulent, inside basally sparsely pilose, apical margin 7- or 8-lobed, lobes oblong and glabrous; anthers opposite to filament tube lobes, abaxially puberulent. Disk annular to shallowly cup-shaped, glabrous. Ovary 4-locular, hispid; style slender, basal part densely villous, apically ± sparsely villous; stigma capitate. Capsule salmon-colored when mature, pyriform-globose, brown pubescent when young but glabrescent. Fl. Jun-Jul, fr. Oct.

Dense forests in ravines and on hills. Guangdong, S Guangxi, S Yunnan [Bhutan, India, Laos, Myanmar, Thailand, Vietnam].

Chisocheton cumingianus includes three subspecies, with subsp. balansae restricted to continental Asia and the other two, subsp. cumingianus and subsp. kinabaluensis (Merrill) Mabberley, occuring in Indonesia, Malaysia, Papua New Guinea, and Philippines. See D. J. Mabberley (Taxon 26: 528. 1977) for a detailed explanation of why the name C. cumingianus must be used for this species.