1	Bracts and sepal margins fimbriate-dentate; plant a squashy annual; stems weak, sharply angular or winged (D. sect. Minicalcara (Khanh) Lidén)		(2)
+	Bracts entire, sepals subentire; leaves (tendril excepted) with 2 primary leaflets (rarely 4, but then opposite); plant a perennial; stems terete to sulcate, but not winged (D. sect. Dactylicapnos)		(5)
2 (1)	Flowers sharply keeled, 8-13 mm wide; stems conspicuously winged-ridged.		7 D. roylei
+	Flowers not keeled, 4-6 mm wide; stems with narrow ridges		(3)
3 (2)	Capsule constricted between seeds; seeds shiny, radially reticulate-striate; first flowers 1-2 m up stem.		8 D. torulosa
+	Capsule smooth; seeds smooth or densely echinulate; first flowers usually 0.1-1 m up stem		(4)
4 (3)	Seeds echinulate; sinus between basal pouches to 1 mm deep.		9 D. lichiangensis
+	Seeds smooth; sinus between basal pouches ca. 2 mm deep.		10 D. leiosperma
5 (1)	Primary leaflets 2, alternate; nectary even or tapering toward apex		(6)
+	Primary leaflets 2 or 4, opposite; nectary much thicker toward apex		(7)
6 (5)	Capsule very fleshy, not dehiscing by regular valves; nectary sigmoid, even or apex shortly acute.		1 D. scandens
+	Capsule membranous with thin marginal wing, dehiscing with valves; nectary sharply geniculate, apex long and thin.		2 D. macrocapnos
7 (5)	Primary leaflets bi- to triternate, each with 8-16 ultimate leaflets; seeds with small elaiosomes; fruit 3-6 × as long as wide		(8)
+	Primary leaflets each with 2-8 ultimate leaflets; seeds with large deeply dissected elaiosomes that keep them together in a clump after valves open; fruit 1.7-2.5 × as long as wide (longer in D. ventii)		(9)
8 (7)	Most leaves with 2 pairs of lateral leaflets; stems 2-4 mm in diam.; nectary not T-shaped; stigma broader than long with large basal papillae; crests of inner petals overtopping apex by 2 mm.		3 D. schneideri
+	Leaves with 1 pair of lateral leaflets; stems 1-2 mm in diam.; nectary T- or Y-shaped; stigma longer than broad with small basal papillae; crests of inner petals overtopping apex by 4 mm.		4 D. burmanica
9 (7)	Primary leaflets each with 4-8 obtuse to subacute ultimate leaflets; fruit with 15-30 seeds.		5 D. gaoligongshanensis
+	Primary leaflets each with 3-5 acute to subacute ultimate leaflets; fruit with 30-50 seeds		(10)
10 (10)	Fruit thin-walled, lanceolate; seeds colliculate. ..... D. ventii (see note above)		(10)
+	Fruit thick-walled, broadly elliptic; seeds echinulate.		6 D. grandifoliolata