Sporoxeia, Smith, 1917

Thuy, Nguyen Thu, Zeng, Sijin, Hai, Do Van, Hoan, Duong Thi, Lin, Zheli & Deng, Yunfei, 2022, Sporoxeia vietnamensis (Melastomataceae), a new species from northern Vietnam, Phytotaxa 558 (3), pp. 283-290 : 289

Key to the species of Sporoxeia

1 Leaves of a pair highly unequal; petioles shorter, less than 1 cm ................................................................................. S. imparifolia

- Leaves of a pair equal or only slightly unequal; petioles longer, usually more than 2 cm long ........................................................ 2

2 L eaf blade orbicular, suborbicular or subobovate-orbicular......................................................................................... S. sciadophila

- Leaf blade oblong, ovate, ovate-lanceolate or ovate-oblong.............................................................................................................. 3

3 Leaf blade base cordate ........................................................................................................................................................... S. rosea

- Leaf blade base obtuse or broadly cuneate......................................................................................................................................... 4

4 Tertiary veins connecting with midvein less than 10 pairs, inconspicuous on adaxial leaf surface.................... S. ochthocharioides

- Tertiary veins connecting with midvein more than 10 pairs, conspicuous on adaxial leaf surface.................................................... 5

5 Stem quadrangular; secondary veins 3 on each side of midvein........................................................................................................ 6

- Stem obtusely quadrangular; secondary veins 2 on each side of midvein ......................................................................................... 7

6 Petioles densely puberulent; calyx lobes oblanceolate............................................................................................. S. clavicalcarata

- Petioles glabrous; calyx lobes broadly ovate to triangular-ovate....................................................................................... S. petelotii

7 Leaf blade ovate-lanceolate, papery; hypanthium ca. 3 mm long, sparsely verrucose ................................................... S. blastifolia

- Leaf blade oblong to ovate-oblong, or broadly ovate, stiffly papery; hypanthium ca. 10 mm long, densely horned.......................... .................................................................................................................................................................................... S. vietnamensis