Abstract
The Mallotus wrayi King ex Hook.f. complex on the Sunda Shelf of the Malay Archipelago (Malay Peninsula, Sumatra, Java, Borneo) appeared to comprise four species instead of a single, very heterogeneous one. Two synonyms (M. caudatus Merr. and M. lancifolius Hook.f.) are resurrected and a new species, M. spinifructus, is described. Important characters can be found in the density of the hairs (glandular scale-like, simple or stellate), type of stellately bundled hairs, lengths of inflorescences, bracts, and bracts of the terminal bud, and in the stigma width and hairiness.
Highlights
Mallotus wrayi King ex Hook.f. is usually identified by one pair of large extrafloral nectaries on the upper surface near the petiole insertion of the blade and an apically very distinctly pulvinate petiole with the blade diagonally attached to it
Several names are usually synonymised with M. wrayi: Mallotus caudatus Merr. (Borneo), M. lancifolius Hook.f. (Malay Peninsula), and M. laevigatus
The leaf margins are entire to laxly dentate/serrate; the density and type of indumentum is extremely variable, from distinctly present to seemingly absent; the presence of extrafloral nectaries is variable, the amount of glandular scale hairs per leaf varies from conspicuous to almost absent, and the lengths and hairiness of the inflorescences, bracts, and scales of the terminal buds vary from short to long, and from subglabrous to densely hairy
Summary
The Mallotus wrayi King ex Hook.f. complex on the Sunda Shelf of the Malay Archipelago (Malay Peninsula, Sumatra, Java, Borneo) appeared to comprise four species instead of a single, very hetero geneous one. M. lancifolius Hook.f.) are resurrected and a new species, M. spinifructus, is described. Important characters can be found in the density of the hairs (glandular scale-like, simple or stellate), type of stellately bundled hairs, lengths of inflorescences, bracts, and bracts of the terminal bud, and in the stigma width and hairiness
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