Begonia amphioxus
A rare, upright (caulescent) limestone-associated begonia from Sabah, Borneo with narrowly lanceolate, peltate, spotted leaves; reproduce by giving warm, very humid, consistently moist conditions in bright-filtered to dappled light and an open, humus-rich but free-draining calcareous substrate. The species is known from a few steep limestone hills (Batu Punggul / Batu Tinahas) and appears to experience little seasonal temperature or humidity variation, so growers should avoid strong dry or cool rest periods.
Where it grows wild
Recorded from the bases and light-shaded tops of small limestone outcrops in the Pensiangan / Sapulut area of Sabah (Batu Punggul and Batu Tinahas). Plants grow in humus-rich pockets and shallow soils at or near limestone, often in light shade below the forest canopy or in crevices on cliff faces. Populations are local and reportedly uncommon.
Type and collection localities are on small limestone hills in interior Sabah (published accounts and locality gazetteers place Batu Punggul/Tinahas broadly in the ~200–500 m elevation band, but exact elevations for individual plants are rarely reported).
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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app.