Uvariopsis, Engl. & Diels, 1899

Gosline, George, Cheek, Martin, Onana, Jean Michel, Ngansop Tchatchouang, Eric, van der Burgt, Xander M., MacKinnon, Lorna & Dagallier, Léo-Paul M. J., 2022, Uvariopsis dicaprio (Annonaceae) a new tree species with notes on its pollination biology, and the Critically Endangered narrowly endemic plant species of the Ebo Forest, Cameroon, PeerJ (e 12614) 9, pp. 1-21 : 8

Key to the species of Uvariopsis (and Dennettia ) in Cameroon

1. - Crushed leaves emitting a strong citrus scent...................................................... U. citrata

- Crushed leaves without citrus scent............................................................................................2

2. - Leaf blades 7.2 – 15.5(– 18) cm long; pedicel 0 – 7(– 9) mm long..............................3

- Leaf blades (11.1 –)16.3 – 38(– 61.5) cm long, pedicel (3 –)8 – 60(– 450)mm long 6

3. - Flowers cauliflorous, pedicel 0 – 2 mm long................................................. U. sessiliflora

- Flowers ramiflorous, pedicel (0 – 2)3 – 11 mm long, sometimes cauliflorous.................4

4. - Flowers bisexual, petals 3 (– 4).............................................................. Dennettia tripetala

- Flowers unisexual, petals 4............................................................................................................5

5. - Young branches glabrous or very sparsely pubescent, petals free ............... U. congensis

- Young branches densely to sparsely pubescent, petals basally fused................. U. zenkeri

6. - Petals basally fused......................................................................................................................7

- Petals free.........................................................................................................................................10

7. - Petals 3..................................................................................................................... U. congolana

- Petals 4...............................................................................................................................................8

8. - Flower buds globose, monocarps verrucose................................................ U. pedunculosa

- Flower buds conical to pyramidal, monocarps smooth..........................................................9

9. - Sepals 5 – 10 mm long, flowers completely covering base of trunk, generally occurring above 800 m a.s.l....................................................................................................... U. submontana

- Sepals 2 – 4 mm long, flowers partially covering base of trunk, generally occurring below 800 m a.s.l...................................................................................................................... U. korupensis

10. - Flowering pedicels 3 – 8 mm long......................................................................................11

- Flowering pedicels 10 – 160 mm long......................................................................................12

11. - Petals linear, 25 – 45 mm long, more than 6 times longer than wide........................... ........................................................................................................................................... U. bakeriana

- Petals elliptic to ovate, 10 – 14 mm long, less than 6 times longer than wide................... .............................................................................................................................................. U. etugiana

12. - Flower buds globose .................................................................................................. U. dioica

- Flower buds conical or narrowly ovoid to pyramidal...........................................................13

13. - Stems and petioles tomentose, lateral nerves 8 – 13 on each side of the midrib; flowers wine brown........................................................................................................................ U. solheidii

- Stems and petioles glabrous; lateral nerves 5 – 8(– 9) on each side of the midrib; flowers green-yellow ....................................................................................................................... U. dicaprio