Hoya australis
A variable climber from Australia, New Guinea and the Pacific with fleshy, round to elliptic, often hairy leaves and clusters of fragrant white flowers with red centers.
Common names: native hoya [1], wax flower [2], common hoya [2], common wax flower [4]Trade labels: Hoya australis 'Lisa' [4]
Traits at a glance
| Leaf shape | Elliptic (oval, widest in the middle); Ovate (egg-shaped, widest below the middle); Orbicular (nearly round) |
|---|---|
| Leaf length | 3–6 cm [1] |
| Leaf width | 2–5 cm [1] |
| Texture | Thick and succulent; Leathery; Hairy; Smooth (hairless) |
| Veins | Veins not visible |
| Leaf markings | Plain green; Variegated forms (cultivars) documented |
| Leaf notes | Flora of Australia describes the blade as elliptic, oblong, narrowly ovate, ovate or orbicular, fleshy or leathery, and anywhere from hairless to densely hairy [2]. In subsp. australis the secondary veins are obscure [3]. |
| Growth habit | Climbing, twining vine; Trailing or pendent |
| Flower colour | White, Cream, Red |
| Flower diameter | 1–2.5 cm [2] |
| Flowers per umbel | 12–30 [1] |
| Fragrance | Fragrant [1] |
| Flower notes | Corolla fleshy, cream to white, red under the corona; corona lobes cream or white [2, 1]. Peduncle 5–25 mm and pedicels 15–25 mm in New South Wales plants [1]. |
Identification
Hoya australis is a twining climber, or occasionally a sub-shrub, with copious latex [2, 1]. In New South Wales it is a hairy climber with stems to 6 m that often scrambles over rocks [1].
The species is very variable. Flora of Australia notes that leaf shape, leaf succulence and flowering time are used to separate its subspecies, while the flowers vary little [2]. Across the species, the blade can be elliptic, oblong, narrowly ovate, ovate or round, up to 15 cm long and 12 cm wide, and fleshy or leathery. The surface ranges from hairless to densely hairy [2]. The New South Wales plants, all subsp. australis, are smaller: broad-elliptic to ovate or almost circular, 3–6 cm long and 2–5 cm wide. Their tips are rounded with a short point, the upper side is thinly hairy or nearly hairless, and the underside is densely hairy [1]. In subsp. australis the secondary veins are obscure [3].
The flowers are 10–25 mm across, with a fleshy, cream corolla that is red under the corona, and cream corona lobes [2]. PlantNET describes New South Wales flowers as white with red centers and fragrant, in umbels of mostly 12–30 [1]. The seed pods are spindle-shaped, 9–15 cm long [2, 1].
Look-alikes. Hoya carnosa is hairless except for its flower clusters [9], whereas many H. australis plants have hairy leaves [2]. Round-leaved plants can suggest Hoya kerrii, but H. kerrii leaves are notched at the tip [10].
Naming and trade labels
The accepted name is Hoya australis R.Br. ex J.Traill [11]. WCVP recognizes seven subspecies: australis, melanesica, nathalieae, oramicola, rupicola, sana and tenuipes [5]. Flora of Australia refers to five subspecies [2]. Plants in the trade may therefore carry a subspecies name, or an older name now placed in a subspecies. NC State lists Hoya oligotricha subsp. tenuipes, Hoya rupicola and Hoya tsiangiana as earlier names [4].
Several names are treated as synonyms of subsp. australis: H. barracki, H. dalrympliana, H. keysii, H. oligotricha, H. tsiangiana and Hoya retusa Warb. [6]. The last one is confusing. Hoya retusa Warb. (1907) belongs here, but Hoya retusa Dalzell is a different, accepted species from India and the eastern Himalaya [7, 11]. Dalzell’s species has its own Hoya retusa page. Because both names exist, check the author name when comparing labels or records.
NC State lists the cultivar ‘Lisa’, whose new leaves are pinkish and whose mature leaves are mottled pale green and cream [4].
Growing it
NC State gives brief care notes for this species; they are supplemented here with general Hoya guidance where noted.
- Light. Bright light gives the best flowering. NC State notes that the leaves darken in low light and turn yellowish in too much light, which is a useful sign when choosing a spot [4]. See the light guide.
- Water and mix. Use a well-drained mix and do not overwater. NC State says the plant likes to be pot-bound and links overwatering to root rot [4]. That fits its wild habitats, which include rock outcrops, vine thickets and dry rainforest [3, 1]. See the watering guide and root rot.
- Humidity. No species-specific advice was found. As general Hoya guidance, RHS suggests raising humidity in the growing season by standing the pot on damp gravel [8]. See the humidity guide.
- Temperature. NC State says the plant can spend summer outdoors but should come inside when the weather cools [4]. No institutional source gives a minimum temperature, so none is stated here.
- Pests. NC State names aphids, mealybugs, scale and spider mites [4]. See hoya pests.
ASPCA does not list H. australis. Flora of Australia notes that subsp. australis is known to be poisonous to livestock, so do not assume this species is harmless to animals [3].
Flowering
NC State notes that, as a house plant, H. australis grows quickly and flowers sooner than many other hoyas. The flowers are borne in clusters on a long stalk and are strongly scented [4]. In New South Wales it flowers in the southern autumn and winter [1]. Flora of Australia gives March to May for subsp. australis, with fruit following three to four months later [3].
Leave the flower stalk in place, because new flowers form on it in later years [4]. See hoya peduncles and why a hoya is not blooming.
Care profile
Based on guidance published for this taxon by the institutions cited. About care basis
| In the wild | Subsp. australis grows on rock outcrops and in rainforest, vine forest and vine thickets from Torres Strait to north-eastern New South Wales [3]; in New South Wales mainly in dry rainforest of the subcoastal ranges, often scrambling over rocks [1]. |
|---|---|
| Light | Bright light for best flowering [4]. NC State notes that leaves darken in low light and turn yellowish in too much light [4]. |
| Watering | Do not overwater; NC State links overwatering to root rot and tags the species as tolerant of dry soil [4]. |
| Humidity | No species-specific guidance found. As general Hoya advice, RHS suggests raising humidity in the growing season with a tray of damp gravel [8]. |
| Potting mix | Well-drained mix; NC State says it likes to be pot-bound [4]. |
| Minimum temperature | Not published for this taxon |
| Difficulty | Easy (editorial rating). The leaves are succulent [2], and NC State covers it as a house plant that grows quickly and flowers sooner than many other hoyas [4]. |
Look-alikes
- Hoya carnosaChina South-Central, China Southeast, East Himalaya and 6 more regions
H. australis leaves range from hairless to densely hairy [2] and are hairy underneath in New South Wales plants [1]; H. carnosa is hairless except for its flower clusters [9].
- Hoya kerriiCambodia, Jawa, Laos and 3 more regions
Round-leaved forms of H. australis have a rounded leaf tip with a short point [1]; H. kerrii leaves are notched at the tip [10].
Related guides
Sources
- Hoya australis — New South Wales Flora Online. PlantNET, Royal Botanic Gardens and Domain Trust, Sydney. Description of New South Wales plants: leaf and flower measurements, flowers per umbel, scent, habitat, flowering season. Accessed 30 September 2026.
- Hoya australis — Flora of Australia (P.I. Forster & D.J. Liddle). Australian Biological Resources Study / Atlas of Living Australia. Species-wide description, leaf and flower ranges, distribution, subspecies note, common names. Accessed 30 September 2026.
- Hoya australis subsp. australis — Flora of Australia (P.I. Forster & D.J. Liddle). Australian Biological Resources Study / Atlas of Living Australia. Obscure secondary veins, habitat, flowering months, note on toxicity to livestock. Accessed 1 October 2026.
- Hoya australis — North Carolina Extension Gardener Plant Toolbox. NC State Extension. Species care notes, cultivar 'Lisa', pests, names used in the trade. Accessed 30 September 2026.
- Hoya australis: accepted subspecies (WCVP via GBIF API). Royal Botanic Gardens, Kew (WCVP) / GBIF. Seven accepted subspecies. Accessed 30 September 2026.
- Hoya australis subsp. australis: synonyms (WCVP via GBIF API). Royal Botanic Gardens, Kew (WCVP) / GBIF. Synonyms including Hoya retusa Warb. and Hoya oligotricha. Accessed 30 September 2026.
- Hoya retusa: name search in WCVP (GBIF API). Royal Botanic Gardens, Kew (WCVP) / GBIF. Hoya retusa Warb. is a synonym of H. australis subsp. australis; Hoya retusa Dalzell is accepted. Accessed 30 September 2026.
- How to grow hoya — RHS Growing Guide. Royal Horticultural Society. General Hoya humidity advice. Accessed 30 September 2026.
- Hoya carnosa — Flora of China Vol. 16. eFloras / Missouri Botanical Garden & Harvard University Herbaria. Hairlessness of H. carnosa, used for the look-alike comparison. Accessed 30 September 2026.
- Hoya kerrii — Flora of China Vol. 16. eFloras / Missouri Botanical Garden & Harvard University Herbaria. Notched leaf tip of H. kerrii, used for the look-alike comparison. Accessed 30 September 2026.
- Hoya australis R.Br. ex J.Traill — World Checklist of Vascular Plants record (via GBIF). Royal Botanic Gardens, Kew; dataset published 2026-06-04, CC BY 4.0. Accepted name, authority, synonyms and native range. Accessed 30 September 2026.
- Hoya australis — Plants of the World Online. Royal Botanic Gardens, Kew. Link built from the IPNI identifier 98382-1; POWO displays the same WCVP data. Accessed 30 September 2026.