Premna, Ngumbau & Musili & Hu, 2021

Ngumbau, Veronicah Mutele, Musili, Paul Mutuku & Hu, Guang-Wan, 2021, Premna mwadimei (Lamiaceae), a new species from Cha Simba, a remnant of coastal forests of Kenya, East Africa, Phytotaxa 510 (2), pp. 155-162 : 161

Key to Kenyan species of Premna .

1. Moist forest trees up to 30 m tall........................................................................................................................................................2

- Dryland and coastal shrubs or climbers often less than 10 m tall ......................................................................................................3

2. Leaves glabrous, 4 whorled............................................................................................................................................. P. angolensis

- Leaves pubescent or at least on the midrib beneath, opposite or 3 whorled ....................................................................... P. maxima

3. Leaves glabrous or nearly so ..............................................................................................................................................................4

- Leaves always hairy ...........................................................................................................................................................................8

4. Leaves smaller up to 80 × 40 mm ......................................................................................................................................................5

- Leaves lager, up to 150 × 120 mm .....................................................................................................................................................7

5. Inflorescence very delicate and few flowered, often appearing lateral ........................................................................... P. gracillima

- Inflorescence coarser, more obviously terminal.................................................................................................................................6

6. Inflorescence generally smaller to shorter up to 55 mm long, leaves drying ± blackish ............................................... P. oligotricha

- Inflorescence usually longer up to 85 mm long, leaves not drying blackish ..................................................................... P. resinosa

7. Shrubs or trees, leaves not markedly discolorous .......................................................................................................... P. serratifolia

- Climbers or scandent shrubs, leaves distinctively discolorous ........................................................................................... P. discolor

8. Leaves with stellate hairs, inflorescence dense ..................................................................................................................................9

- Leaves with simple hairs,inflorescence lax ......................................................................................................................................10

9. Shrubs or small trees up to 6 m tall, older stems ridged or thinly corky...................................................................... P. chrysoclada

- Scandent shrubs or more often lianas up to 10 m long, older stems with persisting thorns not ridged or corky............ P. mwadimei

10. Leaves with petioles usually longer up to 50 mm long............................................................................................... P. hildebrandtii

- Leaves with petioles less than 35 mm long......................................................................................................................................11

11. Petioles short, 4–10 mm long, leaves discolorous very short acuminate. Inflorescence up to 40 mm long ....................... P. velutina

- Petioles longer up to 35 mm long, leaves not discolorous, distinctively long acuminate. Inflorescence often less than 10 mm long ............................................................................................................................................................................................ P. senensis