Dactylanthus is a monotypic genus of fully parasitic (holoparasitic) flowering plant in the family Mystropetalaceae, order Santalales, containing the single species Dactylanthus taylorii — commonly known as wood rose, or in Māori as "te pua o te rēinga" ("flower of the underworld"). It is endemic to New Zealand's North Island, where it is the country's only fully parasitic native plant.
The plant itself is a round, warty, tuber-like stem or haustorium up to 50 cm wide, with no roots of its own; it draws all its nutrients from the roots of host trees. Its leaves do not photosynthesise and are reduced to small floral bracts, and individual plants can persist for more than 30 years. Rather than growing a visible stem or trunk, Dactylanthus attaches to the roots of about 30 species of native hardwood trees and shrubs — including patē/seven-finger, five-finger, lemonwood and putaputawētā — typically in damp soil near small streams in secondary forest bordering mature podocarp forest. The host root responds to the parasite's attachment by forming a distinctive burl-like swelling that resembles a fluted wooden rose, giving rise to the common name. Its flowers emerge at ground level and are pollinated by a ground-foraging native bat, an unusual pollination strategy among flowering plants.
Taxonomically, Dactylanthus's closest relative is Hachettea of New Caledonia; together with the South African genus Mystropetalon, the three genera form the Southern Hemisphere family Mystropetalaceae, all holoparasites descended from photosynthesising, hemiparasitic root-parasite ancestors.
The genus was first collected by Europeans in 1845 by Rev. Richard Taylor and formally described by Joseph Hooker in 1859. Today it is classified as Threatened – Nationally Vulnerable, with New Zealand's Department of Conservation running an active recovery programme against threats from collector harvesting, browsing mammals (possums, rats, pigs, deer), and habitat loss.
Etymology
The genus name comes from Greek δάκτυλος (dáktulos, "finger") and ἄνθος (ánthos, "flower"); the sole species' epithet, taylorii, honours Rev. Richard Taylor, who first collected it in 1845.
Distribution
Dactylanthus is endemic to New Zealand's North Island, ranging from Puketi Forest in Northland south to Mt Bruce and from Mt Taranaki to Te Araroa, with an outlying population on Little Barrier Island; fossil pollen shows it once occurred in the northern South Island as well. A previously unknown wild population was found near Wainuiomata in 2025, the first Wellington-region record since 1914.
Ecology
As a holoparasite, Dactylanthus lacks roots, chlorophyll and functional leaves, drawing all nutrients from the roots of roughly 30 native hardwood host species growing in damp soil near streams at the margins of podocarp forest. Its attachment causes the host root to swell into a distinctive rose-shaped burl, and its ground-level flowers are pollinated by a native ground-foraging bat.
Conservation
Dactylanthus taylorii has been classified Threatened – Nationally Vulnerable (as of 2012), and New Zealand's Department of Conservation has run a recovery plan since 1995. It is threatened by collector harvesting, browsing mammals (possums, rats, pigs, deer), habitat loss, and scarcity of its pollinators and seed dispersers; protective caging must be paired with hand-pollination since caging also excludes pollinators. Seed-based translocations to sites such as Zealandia, Otari-Wilton's Bush and Ngā Manu Nature Reserve have succeeded in establishing new populations.
Cultural Uses
In Māori the plant is called "te pua o te rēinga" — "flower of the underworld" (rendered by Joseph Hooker as "flower of Hades") — and its wood-rose-shaped host galls have commercial collector value. An alternate Māori name recorded regionally, "waewae atua" ("feet/toes of the spirits/gods"), has also been used for it.
History
Dactylanthus taylorii was first collected by Europeans in March 1845 by Rev. Richard Taylor near Raetihi. Taylor carried a specimen to England in 1856, and Joseph Hooker formally described the species in 1859.
Taxonomy Notes
Dactylanthus is monotypic. Its closest relative is Hachettea of New Caledonia, and together with the South African genus Mystropetalon the three form the Southern Hemisphere family Mystropetalaceae (order Santalales per GBIF) — a lineage of holoparasites descended from photosynthesising, hemiparasitic root-parasite ancestors.
