Macrosolen acunae

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Macrosolen acunae


Glabrous. Leaves opposite, sometimes seemingly superposed; lamina ovate, 20-30 (-50) by 7-10(-19) cm, truncate to cordate at the base, subsessile or with a petiole to 2 mm long, often bullate between the veins, acuminate and acute at the apex, lustrous above, dull below; venation pinnate with the midrib and the main laterals distinct on both sides. Inflorescences at the nodes and on the epicortical runners, a raceme of 2-6 opposite crowded pairs of flowers; axis 5-10 mm long, subtended at the base by an involucre of broad short bracts; pedicels 1-2 mm long; bracts erect, acuminate, 3-5 mm long.


Asia-Tropical: Malaya (Peninsular Malaysia present), Mindanao present, northern Borneo present
Malesia: Peninsular Malaysia, northern Borneo, Mindanao.


The holotype of Elytranthe acunae (PNH) is not extant. An isotype has been seen (US) and designated lectotype of the species name. Similar vegetatively to Macrosolen beccarii, differing in the longer corolla with different proportions, especially at the apex.