Ardisia, Swartz, 1788

Julius, Avelinah & Utteridge, Timothy M. A., 2021, Ardisia recurvisepala (Primulaceae-Myrsinoideae), a new species from Peninsular Malaysia, Phytotaxa 480 (1), pp. 79-84 : 83

Key to Ardisia subgenus Crispardisia in Peninsular Malaysia

1. Inflorescences strictly terminal on lateral leafy branches ..................................................................................................................2

- Inflorescences lateral (axillary) and/or terminal on main stem or lateral branches ...........................................................................5

2. Lamina coriaceous, rarely subcoriaceous, relatively small 2.5–6.5(–9) cm long, rarely up to c. 13 cm long................................................................................................................................. Ardisia rosea King & Gamble (1906: 150)

- Lamina chartaceous, rarely subcoriaceous, larger (7–)9–16(–18) cm long .......................................................................................3

3. Inflorescences much branched, peduncle longer (1.5–) 5 cm long ................................ Ardisia polysticta Miq. ( Miquel 1861: 576)

- Inflorescences usually unbranched, and if only 1–2 with peduncle(s) then these less than 1.5 cm long...........................................4

4. Leaf apex obtuse, sometimes acute, secondary veins closely spaced ....................................................................... Ardisia crenata

- Leaf apex long acuminate to acuminate-caudate, secondary veins laxly spaced ......... Ardisia ridleyi King & Gamble (1906: 148)

5. Inflorescence strictly lateral (axillary) on main stem .........................................................................................................................6

- Inflorescence lateral (axillary) and/or terminal on main stem or lateral branches .............................................................................7

6. Lamina oblong-lanceolate, subcoriaceous, apex usually shortly acuminate rarely long and slightly caudate, 0.5–1(–2) cm long; pedicels longer and slender ................................................................................... Ardisia sphenobasis Scheff. ( Scheffer 1867: 65)

- Lamina elliptic, coriaceous, apex long acuminate-caudate, 2–2.5 cm long; pedicels shorter and thicker................... Ardisia minor

7. Inflorescence lateral (axillary) and terminal on lateral branches ..................................................................... Ardisia lankawiensis

- Inflorescence lateral (axillary) on main stem and/or terminal on lateral branches ............................................................................8

8. Lamina oblanceolate-elliptic, apex acuminate, densely, villous-pilose hairs on both surfaces; inflorescences terminal on lateral branches; hairs white ................................................................................................................................................... Ardisia villosa

- Lamina narrowly elliptic to oblong-elliptic, apex acuminate-caudate, lamina soon glabrescent except the midrib; inflorescences lateral (axillary) on main stem and terminal on short lateral branch; hairs rust coloured............................... Ardisia recurvisepala