Primulina, Hance, 1883

Ding, Cong, Liu, Ang, Yu, Xun-Lin & Zhang, Chun-Ping, 2021, Primulina cataractarum sp. nov. (Gesneriaceae) from limestone landform in Southern Hunan, China, Phytotaxa 511 (1), pp. 51-64 : 59

Key to similar species of Primulina in southern Hunan

1. Bracts lanceolate, shoter than 1.5 cm .................................................................................................................................................2

- Bracts broadly ovate or ovate to elliptic, longer than 1.5 cm .............................................................................................................3

2. Leaf blade nearly rounded, abaxial leaf surface purple, leaf margins entire................................................................... P. porphyrea

- Leaf blade, elliptic to broadly elliptic, abaxial leaf surface green, leaf margins conspicuously serrate ...................... P. jiuyishanica

3. Leaf margin entire, corolla yellow ........................................................................................................................... P. jiangyongensis

- Leaf margins entire or denticulate, corollapurple...............................................................................................................................4

4. Leaves small (shorter than 6cm), ovate to rounded, shorter than 8 cm, bracts shorter than 3 cm ............................. P. cataractarum

- Leaves large (7–25cm),, broadly ovate, longer than 10 cm, bracts longer than 3 cm ........................................................................5

5. Leaf bases oblique, margins repand to denticulate, veins conspicuous.................................................................... P. hengshanensis

- Leaf bases rounded or cordate, margins entire or shallowly serrate, veins unconspicuous ...............................................................6

6. Petioles longer than 9 cm, leaf blades cordate or deeply cordate at base...................................................................... P. hunanensis

- Petioles shorter than 9 cm, leaf blades rounded or shallowly cordate, adaxially dark green, abaxially dark purple........................... .................................................................................................................................................................................. P. rubribracteata