Polyscias is a genus of tropical evergreen (rarely deciduous) shrubs, small trees, and occasional lianes in the ginseng family, Araliaceae. The genus was erected in 1776 by Johann Reinhold Forster and Georg Forster, and its name comes from the Greek polys, "many," and skias, "shade" or "umbrella," a reference to the layered, often divided foliage. Plants of the World Online accepts 181 species, while general references put the total at roughly 180 species as of early 2026.
Members of the genus are best recognised by their highly variable, alternate leaves. A single plant may carry undivided leaves or compound leaves that are pinnate, bipinnate, or even tripinnate, with margins that range from entire to toothed or deeply lobed. This foliar diversity is one reason the cultivated species are so widely grown as ornamentals — leaf shape alone can mimic ferns, parsley, or coffee. Inflorescences are similarly variable, formed as panicles, umbels, racemes, or whorls of small flowers.
In cultivation the genus is represented by woody shrubs and small trees with slender, upright branches and a dense, erect habit, typically reaching 6–8 ft (1.8–2.4 m) tall and 2–3 ft (0.6–0.9 m) wide. Outdoors, plants thrive only in frost-free tropical climates (USDA zones 11–12); in temperate regions they are grown as warm-loving houseplants that demand bright indirect light, high humidity, and minimum temperatures around 60°F (16°C). All parts contain saponins and are considered toxic to humans and pets if ingested, and the sap can cause contact dermatitis.
The genus has a long taxonomic history. In 2010 Lowry and Plunkett recircumscribed Polyscias to absorb six related genera, producing the broader, infragenerically structured concept used today. The accepted name remains Polyscias J.R.Forst. & G.Forst., and the genus sits firmly within the family Araliaceae and the order Apiales.
Etymology
The genus name combines the Greek polys, meaning "many," with skias, meaning "shade" or "umbrella" — a nod to the multiply divided, layered foliage that characterises many species in the group.
Distribution
Polyscias is a pantropical Old World genus. Its native range stretches from tropical Africa east through Madagascar and the Seychelles, across South and Southeast Asia, into New Guinea and northern Australia, and out across the Pacific to Fiji, Hawaii, and numerous island archipelagos. Country-level records from horticultural references include Angola, Cameroon, Ghana, Kenya, India, Cambodia, Vietnam, Thailand, the Philippines, and Borneo. Through long cultivation as ornamentals and food plants, several species are now established beyond this native range, with introduced populations in the Caribbean (Bahamas, Dominican Republic, Puerto Rico, Trinidad and Tobago), Central America, Bangladesh, Myanmar, China, and additional Pacific islands.
Ecology
Species of Polyscias typically inhabit primary and secondary tropical forests across the genus's broad Old World range, where they grow as understorey or canopy shrubs and small trees.
Cultivation
Only about six species of Polyscias are widely cultivated, almost all as ornamentals valued for their finely divided or boldly variegated foliage. In tropical climates (USDA zones 11–12) they can be grown outdoors as hedging or specimen shrubs; everywhere else they are kept as houseplants. Indoors they want bright indirect light or partial shade, steady warmth (never below about 60°F / 16°C), and high humidity. The growing medium should be moist, well-drained, organically rich, and slightly acidic, allowed to dry somewhat between deep waterings — both prolonged sogginess and bone-dry soil cause trouble. Common problems include root rot in overwatered plants, spider mites in dry air, leaf drop from low humidity, and infestations of aphids, scale, mealybugs, whiteflies, and nematodes. All parts contain saponins and are poisonous to humans and pets if ingested, and sap contact can trigger dermatitis.
Propagation
The standard propagation method is stem cuttings, which root readily under warm, humid conditions. For Polyscias fruticosa specifically, the wider toolkit includes fresh seed, ~10 cm stem cuttings with bottom heat at 21–23°C, root cuttings of around 25 mm segments, air layering, and division of root suckers.
Conservation
A substantial number of Polyscias species are threatened in the wild. Multiple species — predominantly Hawaiian, Mauritian (Mascarene), and New Caledonian island endemics — are listed as Endangered or Critically Endangered, reflecting the genus's heavy radiation into vulnerable insular floras.
Cultural uses
Beyond their ornamental role, several Polyscias species have culinary and medicinal traditions. Polyscias fruticosa (Ming aralia), in particular, has a centuries-long history in Southeast Asian traditional medicine, where it is regarded as analgesic, febrifuge, and diuretic. Its young leaves and shoots are cooked — steamed as greens or added to soups — for a parsley-like aromatic flavouring. In parts of Polynesia, including Tonga, cultivated polyscias (locally called tanetane) are commonly clipped into ornamental hedges.
Taxonomy notes
Polyscias J.R.Forst. & G.Forst. is an accepted genus of Araliaceae (order Apiales) with 181 species accepted by Plants of the World Online and roughly 180 by other current references. The genus as understood today reflects the 2010 recircumscription by Lowry and Plunkett, who absorbed six previously distinct genera into Polyscias and introduced a new infrageneric classification (sections and subgenera, including the autonyms Polyscias sect. Polyscias and Polyscias subgen. Polyscias). The original protologue is Forster & Forster, Characteres Generum Plantarum 63, t. 32 (1775).
History
Polyscias was formally erected in 1775–1776 by Johann Reinhold Forster and his son Georg Forster — naturalists who sailed with James Cook's second Pacific voyage — and was published in their Characteres Generum Plantarum. The modern concept of the genus, however, dates to 2010, when Lowry and Plunkett's "Recircumscription of Polyscias (Araliaceae) to include six related genera, with a new infrageneric classification" consolidated several related Araliaceae genera under the Polyscias name.
