Lijndenia, Stone & Luke, 2015

Stone, Robert Douglas & Luke, Quentin, 2015, Lijndenia udzungwarum (Melastomataceae-Olisbeoideae): a new, endemic species from the Udzungwa Mountains of southern Tanzania, Phytotaxa 226 (2), pp. 169-176 : 174

Key to the species of Lijndenia in Tanzania

The identification key provided below includes the new species L. udzungwarum described in the present work, as well as the two other currently recognized Tanzanian species of Lijndenia . In the Flora of Tropical East Africa ( Wickens 1975), the latter two species were treated in Memecylon sensu lato (see Introduction). Plants resembling L. brenanii and L. procteri from southern Tanzania (including the Udzungwa Mountains) are not yet fully described (see Discussion), so they are not included in this key.

1. Leaf bases cordate; inflorescences 3-flowered; peduncles slender, 10–20 (–27) mm long; secondary inforescence axes and pedicels absent. Udzungwa Mountains ................................................................................................................................... L. udzungwarum

- Leaf bases cuneate to rounded (not cordate); inflorescences with up to 11 or more flowers; peduncles quadrangular, to 11 mm long; secondary inflorescence axes to 9 mm long; pedicels distinct, to 4 mm long....................................................................................2

2. Habit arboreal (to 18 m high); leaves up to 7.5 cm long × 4 cm wide; cymes once or twice branched, 3–11-flowered, up to 3 cm long; peduncles 5 − 11 mm long. East Usambara Mountains .............................................................................................. L. brenanii

- Habit fruticose (to 5 m high); leaves up to 4.5 cm long × 3 cm wide; cymes simple (occasionally with an additional axis 1–2 mm long above the peduncle), 1–3-flowered, up to 1.5 cm long; peduncles 2–7 mm long. West Usambara and South Pare mountains.. ............................................................................................................................................................................................. L. procteri