Memecylon ultramaficum R.D. Stone, 2022

Stone, Robert Douglas, 2022, Ten new species of Memecylon (Melastomataceae) from Madagascar, Candollea 77 (1), pp. 81-103 : 100

Memecylon ultramaficum R.D. Stone , sp. nov. ( Fig. 11).

Holotypus: MADAGASCAR. Reg. Alaotra-Mangoro [Prov. Toamasina]: Ambatovy forest, up to Berano village , 18°50'13"S 48°19'19"E, 1130 m, 17. I .2005, fl., Antilahimena & Andriambololona 3209 (CAS-1104896!; iso-: CAS- 1164683!, P [ P04802233 ]!) .

Affine Memecyloni eduliformi Aug. DC., sed ab eo ramulis juvenilibus quadrangularibus et anguste alatis (non teretibus), petiolis brevioribus 1–2 mm (non 2–3 mm) longis, laminis foliaribus minoribus 1–3 × 0.5–2 cm (non 6–7 × 2.5–3 cm), floribus minoribus hypantho-calyce 1.5 × 1.75 mm (non 2 × 2 mm), petalis 2 × 0.8 mm (non 3 × 1.5 mm), filamentis 1.5 mm (non 3–3.5 mm) longis, stylo 4 mm (non 8 mm) longo et fructus corona calycina absente (non prominente) differt.

Evergreen shrubs or trees 3.5–8 m tall; bark greyish brown to whitish, finely longitudinally fissured; young branchlets quadrangular-alate; nodes somewhat thickened; internodes 0.5–2.5(–4.7) cm long. Leaves subcoriaceous, petiolate, bright green on the upper surface, paler green beneath (drying brown and with texture granular-rugose); petioles 1 – 2 mm long; blades elliptic to obovate or suborbicular, 1–3 × 0.5–2 cm, base cuneate and confluent with the petiole, apex obtuse, rounded,