1	Corolla interior glabrous.		(2)
+	Corolla interior hairy.		(5)
2 (1)	Leaf blade 1-1.5 mm wide; corolla ca. 2 mm		8 Biondia longipes
+	Leaf blade 7-15 mm wide; corolla 3-4.5 mm.		(3)
3 (2)	Corolla lobes 1/3-1/2 as long as tube; leaves 3-6 × 0.7-1 cm		1 Biondia chinensis
+	Corolla lobes less than 1/4 as long as tube; leaves 5-9 × 1-1.5 cm.		(4)
4 (3)	Inflorescences including flowers 1.5-2.5 cm; corolla broadly cylindric, ca. 2 mm wide		2 Biondia hemsleyana
+	Inflorescences including flowers less than 1 cm; corolla urceolate, ca. 1 mm wide at throat, broader below		3 Biondia parviurnula
5 (1)	Corolla tube clearly shorter than lobes.		(6)
+	Corolla tube as long as or longer than lobes.		(8)
6 (5)	Pedicel 2-5 mm; internodes uniformly minutely puberulent when young, later glabrescent; leaf veins mostly obscure, never pale and reticulate		11 Biondia henryi
+	Pedicel 10-15 mm; internodes with distinct lines of hairs; veins of older leaves becoming prominently pale and reticulate.		(7)
7 (6)	Abaxial leaf surface with 2 or 3 main lateral vein pairs at acute angles to midrib plus up to 6 minor lateral veins at ca. 90º to midrib		12 Biondia insignis
+	Abaxial leaf surface with lateral veins 5-7 pairs at ca. 45º to midrib, all similar		13 Biondia laxa
8 (5)	Corolla tube urceolate, clearly widest below throat.		(9)
+	Corolla tube cylindric or campanulate, widest at throat or with parallel sides.		(10)
9 (8)	Internodes puberulent along 1 side only; petiole 5-10 mm		4 Biondia microcentra
+	Internodes uniformly puberulent; petiole 1-2 mm		5 Biondia yunnanensis
10 (8)	Leaves to 13 mm wide; inflorescences with an umbel-like cyme; sepals glabrous		6 Biondia tsiukowensis
+	Leaves to 5 mm wide; inflorescences often with 2 cymules separated by a distinct rachis; sepals sparsely puberulent.		(11)
11 (10)	Corolla tube longer than lobes; cymules racemelike with short but distinct rachis		7 Biondia crassipes
+	Corolla tube as long as lobes; cymules umbel-like with rachis completely suppressed.		(12)
12 (11)	Stems hairy along 1 side only; pedicel 4-6 mm		9 Biondia pilosa
+	Stems minutely hairy along 2 sides; pedicel 7-9 mm		10 Biondia revoluta