Small liana or subscandent shrublet to 3 m, glabrous, with perennial rootstock; older stem corky, shoots often lenticellate; tendrils 3-10 (-15) cm. Leaves simple, variable (heterophyllous), elliptic to lanceolate (to linear), apex acute to (long) acuminate, base acute to attenuate, margin entire or regularly to irregularly dentate, or leaves pinnately lobed to various depth, the lobes acute to rounded, 2,5-13 x 0,7-4,5 cm; leaves in sapling-, or sterile- or juvenile shoots often lanceolate to linear, (deeply) pinnately lobed, the lobes broad or narrow, 10-30 x 0,2-2 cm; petioles 4-12 mm, in juvenile leaf-forms 0-4 mm; glands on petiole absent, or 1 (or 2) pair(s) at the apex; glands on blade-margin several, minute, mostly at the tips of the teeth; stipules subtriangular-linear, c. 0,5 mm. Inflorescences 1-3-flowered, often arranged in short shoots from the supra-axillary bud; bracts subtriangular, 0,5-1 mm. Flowers glabrous, stipe 6-25 mm; hypanthium small, shallowly cup-shaped, c. 3-4,5 mm wide; sepals 3 or 4, elliptic to oblong, obtuse, 6-11 X 3-6 mm; petals 2-4, elliptic to oblong, obtuse, 5-10 mm long; corona single 5-
