Dorstenia, Linnaeus, 1753

Fischer, Eberhard & Killmann, Dorothee, 2015, A new species and new records of Dorstenia (Moraceae, Dorstenieae) from Rwanda, East Africa, Phytotaxa 212 (3), pp. 213-220 : 217

Key to the species of Dorstenia from Rwanda

1. Stems non-succulent, with elongated slender rhizomes. Plants of rainforests...................................................................................2

- Stems succulent, with tubers or tuberous rhizomes. Plants of savanna or dry forests.......................................................................6

2. Lamina with long hairs above............................................................................................................................................................3

- Lamina glabrous or scabrous above...................................................................................................................................................4

3. Receptacle actinomorphic, funnel-shaped.......................................................................................................................... D. brownii

- Receptacle zygomorphic, naviculate, ± vertical................................................................................................................ D. psilurus

4. Receptacle naviculate, vertical, at apex a long and at the base a short appendage, margin of receptacle entire or occasionally with 1–5 lateral appendages ...................................................................................................................................................... D. psilurus

- Receptacle different, discoid or flattened to navicular.......................................................................................................................5

5. Receptacle discoid, with dark purple flowering face, margin light purple, primary appendages greenish-purple, secondary appendages purple-tinged, lower surface of leaves with purple veins and dense tomentose indumentum ...................... D. marijanmatoki i

- Receptacle flattened to navicular, with blackish-purple flowering face, margin green, primary appendages green, secondary appendages green, lower surface of leaves entirely green and tomentose mainly on the veins.................................... D. nyungwensis

6. Plants with a discoid to subglobose or irregularly shaped tuber or tuber-like rhizome ........................................... D. benguellensis

- Plants with stout or tuberous rhizomes...............................................................................................................................................7

7. Fringe of receptacle indistinct or lacking, appendages at anthesis in 2 distinct rows............................................... D. hildebrandtii

- Fringe of receptacle distinct, c. 1–2.5 mm wide, appendages almost in 1 row at anthesis (basically in 2 rows) .......... D. warneckei