Viola subgen. Viola sect. Adnatae (Becker, 1925) Wang, 1991

Chen, You-Sheng & Jin, Xiao-Hua, 2015, Viola nujiangensis (Violaceae), a new species of from northwestern Yunnan, China, Phytotaxa 230 (2), pp. 193-197 : 196

Key to species of Viola subgen. Viola sect. Adnatae in Yunnan, China

1. Spur more than 4 mm long.................................................................................................................................................................2

- Spur less than 3 mm long...................................................................................................................................................................5

2. Leaf blade lanceolate, margin shallowly crenate, base distinctly decurrent to petioles................................................... V. philippica

- Leaf blade ovate, margin serrate or deeply crenate, base not decurrent to petiole.............................................................................3

3. Lateral petals glabrous or sparsely bearded..................................................................................................................... V. belophylla

- Lateral petals distinctly bearded.........................................................................................................................................................4

4. Petals violet ................................................................................................................................................................. V. tienschiensis

- Petals white................................................................................................................................................................. V. sphaerocarpa

5. Leaf blade orbicular to suborbicular; rhizome densely noded .......................................................................................... V. striatella

- Leaf blade ovate, oblong, elliptic, triangular or cordate; rhizome sparsely noded............................................................................6

6. Leaf blade ovate or cordate ....................................................................................................................................... V. yunnanfuensis

- Leaf blade elliptic, oblong or triangular.............................................................................................................................................7

7. Leaf blade base truncate or cordate; stipules brownish......................................................................................................................8

- Leaf blade base rounded or cuneate; stipules whitish........................................................................................................................9

8. Leaves triangular-lanceolate, base truncate, usually distinctly decurrent to petiole; spur short .................................. V. betonicifolia

- Leaves triangular-ovate, base cordate or truncate, slightly or not decurrent to petiole; sepal auricles usually distinct, spur slender. ...................................................................................................................................................................................... V. inconspicua

9. Lateral petals bearded................................................................................................................................................... V. trichopetala

- Lateral petals glabrous......................................................................................................................................................................10

10. Rhizome and root slender, spur ca. 2 mm long, stipules whitish and membranous, leaf blade adaxially pubescent....... V. perpusilla

- Rhizome and root stout, spur ca. 4 mm long, stipules and petiole purplish, leaf blade glabrous on both surfaces ..... V. nujiangensis