Priogymnanthus, P. S. Green, 1994

Fernández-Alonso, José Luis & Morales, Paula Andrea Morales, 2019, Priogymnanthus colombianus (Oleaceae), a new species and first record of genus to Colombia, Phytotaxa 399 (3), pp. 195-202 : 201

Key to the species of Priogymnanthus

1. Leaves (4.5) 5–10 cm wide, coriaceous, broadly elliptic-ovate, apex obtuse to rounded; anthers 4 mm long............ P. hasslerianus

- Leaves always less than 5 cm wide, chartaceous, oblong to oblong-elliptic, apex acute or acuminate; anthers 2.5–3.5(4) mm long ............................................................................................................................................................................................................ 2

2. Abaxial blades villose; inflorescence about 7 mm; anthers 2.5 mm long........................................................................ P. saxicolus

- Abaxial blades glabrous; inflorescence longer than 7mm; anthers 3–4 mm long.............................................................................. 3

3. Leaves with petioles 5–10 mm long, inflorescences 15–19 mm long, 5–9 flowered; petals 2 mm long, narrowly elliptic; anthers 3–4 mm long, stigma subglobose, 0, 5 mm long; fruit obpyriform, 20–25 x 17–20 mm ..................................................... P. apertus

- Leaves with petioles 10–19 mm long, inflorescences (15) 18–25 mm long, 7–11 flowered; petals 4–5 mm long, linear-lanceolate; anthers 3 mm long; stigma deltoid, 0,8– 1 mm long; fruit globose, 10–15 x 11–14 mm ............................................ P. colombianus