1	Leaves simple, rarely 3-foliolate on lower 2-4 short shoots		(2)
+	Leaves palmately compound, 3-foliolate or simple on long branches		(3)
2 (1)	Old branches without woody wings; branchlets glabrous or with sparse, soft hairs; petioles and leaves glabrous or only veins abaxially sparsely pubescent.		4 P. tricuspidata
+	Old branches mostly with woody wings; branchlets, petioles, and abaxial leaf surface densely ferruginous pilose, adaxially pubescent.		5 P. suberosa
3 (1)	Leaves palmately 5-foliolate; inflorescence a paniculate-polychasium, typically with a well-developed main axis		(4)
+	Leaves 3-foliolate, or simple on long branches; inflorescence a panicle or corymbose polychasium		(6)
4 (3)	Young tendrils with slender, slightly curving apex, but not conspicuously expanded at tip.		9 P. quinquefolia
+	Young tendrils with apex expanded as tubercles		(5)
5 (4)	Stem oblate, or with conspicuous 6 or 7 ridges; leaflet adaxial surface conspicuously bullate.		7 P. laetevirens
+	Stem with 4 ridges; leaflet surfaces not bullate.		8 P. henryana
6 (3)	Inflorescence a racemose polychasium, relatively compact, main axis well developed, nearly as thick as branch subtending it; young apex of tendril slightly expanded as fist-shaped adhesive disks.		1 P. feddei
+	Inflorescence a corymbose polychasium, loose, main axis slender; young apex of tendril slender and curving or expanded as ball-shaped adhesive disks		(7)
7 (6)	Leaves of 2 types, 3-foliolate and simple; young apex of tendril expanded to ball-like structures.		6 P. dalzielii
+	Leaves mostly 3-foliolate, rarely mixed with 3-lobed, simple leaves; young apex of tendril slender, curving		(8)
8 (7)	Branchlets, petioles, and leaflet veins abaxially sparsely pilose; central leaflet 5-13 × 3-6.5 cm, margin with 6-11 teeth on each side.		2 P. semicordata
+	Branchlets, petioles, and leaflets abaxially glabrous or only veins abaxially sparsely pubescent; central leaflet 2.5-5 × 1.5-3 cm, margin with 3-5 teeth on each side.		3 P. chinensis