Hoya australis
A variable twining climber of rainforest margins, vine thickets, open forest and rock outcrops from north-eastern New South Wales around northern Australia, and north to New Guinea, the south-west Pacific, Sulawesi and Sabah. The measured sites, almost all in eastern Australia, are subtropical, with a warm wet summer and a cool, fairly dry winter. It is tougher and more sun-tolerant than most hoyas: give it strong light, a cooler, drier winter and sharp drainage.
Where it grows wild
In Australia it grows in rainforest and rainforest margins, open forest and vine thicket, typically scrambling over granite boulders and sometimes on old sand dunes. It twines through shrubs and trees and roots onto rocks rather than sitting high in a closed canopy. The subspecies differ in habitat: subsp. rupicola is an erect, non-twining plant of sandstone outcrops in the Kimberley and Top End, and subsp. sanae grows in foreshore vine thickets on Cape York.
Subsp. australis runs from near sea level to about 600 m in north Queensland. The wild records span 5–950 m with a median of about 180 m.
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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.