Gardens’ Bulletin Singapore 71 (1): 185–241. 2019 185 doi: 10.26492/gbs71(1).2019-12 A taxonomic revision of Macrolenes (Melastomataceae) A. Kartonegoro1,2, P. Hovenkamp1, P.C. van Welzen1,3 1Naturalis Biodiversity Center, P.O. Box 9517, 2300 RA Leiden, The Netherlands
[email protected]. 2Research Center for Biology, Indonesian Institute of Sciences (LIPI), Jl. Jakarta-Bogor KM.46, Cibinong 16911, Indonesia. 3Institute of Biology Leiden (IBL), Leiden University, P.O. Box 9505, 2300 RA Leiden, The Netherlands. ABSTRACT. Macrolenes (Melastomataceae: Dissochaeteae), a genus of woody climbers in Malesia, is taxonomically revised. Seventeen species are recognised, of which three are new to science. The genus is characterised by its scrambling habit, a pair of hair cushion domatia on the base of the leaves, axillary inflorescences, and fimbriate connective appendages on the alternipetalous stamens. An identification key, nomenclature, descriptions, typification, geographic distributions and taxonomic notes are provided. The affinities with Dissochaeta, also woody climbers, are discussed. Keywords. Dissochaeta, Dissochaeteae, Macrolenes, Malesia, Melastomataceae, revision, taxonomy Introduction Macrolenes Naudin is a genus of woody climbers distributed strictly in the Malesian region. The genus is allied to Dissochaeta Blume; both are characterised by a scrambling growth habit, opposite phyllotaxy sometimes with interpetiolar outgrowths, flowers 4-merous, 2 whorls of dimorphic stamens and berry-like fruits. Macrolenes and Dissochaeta are classified in tribe Dissochaeteae (Naudin) Triana (Bakhuizen van den Brink, 1943; Maxwell, 1984; Clausing & Renner, 2001), but are sometimes also considered to be part of tribe Miconieae (Naudin, 1851; Miquel, 1855; Renner, 1993). The last complete revision of Macrolenes was by Bakhuizen van den Brink (1943) and some notes were published by Nayar (1980).