Lindera is a genus of roughly 94 accepted species of evergreen and deciduous shrubs and small trees in the laurel family, Lauraceae. The genus was formally described by Carl Peter Thunberg in 1783 (with the name conserved) and commemorates the Swedish physician Johan Linder (1676–1724). Most species are concentrated in eastern and Southeast Asia, with the range extending from China and Japan south to Queensland, Australia and west into India; three relict species occur in eastern North America, where they are interpreted as remnants of a once more humid forest flora.
Plants in the genus carry alternate leaves that are entire or, in several species, distinctively three-lobed. Crushed foliage, twigs, and fruits release a strong spicy, aromatic scent — the source of the common name "spicebush" applied to several members of the group. Flowers are small and yellow and appear in compact umbel-like clusters, typically on bare branches in late winter or early spring. Lindera species are dioecious, so male and female flowers occur on separate individuals, and only female plants set fruit: small one-seeded drupes that ripen red, purple, or black and are attractive to birds.
Ecologically, Lindera occupies understory and forest-margin habitats with adequate moisture, ranging from light shade beneath closed canopies to open clearings. The genus has notable wildlife associations: in North America, Lindera benzoin is a larval host for the spicebush swallowtail butterfly and the promethea silkmoth, and its drupes are dispersed by migrating thrushes and other songbirds. Dioecy makes Lindera populations sensitive to fragmentation, a factor that has helped push the southeastern U.S. Lindera melissifolia (pondberry) onto the U.S. Endangered Species list.
Several Lindera species have a long record of human use. Lindera benzoin — used medicinally by Cherokee, Creek, and Iroquois peoples and consulted by early American land surveyors as an indicator of fertile bottomland — yields a citrus-spicy tea from its leaves and twigs and dried fruits that have been used as a substitute for allspice. Asian species such as L. obtusiloba (Japanese spicebush) are valued ornamentally for fragrant early-spring flowers and bright yellow autumn foliage. Several members of the genus produce alkaloids and essential oils that have drawn pharmacological interest.
Etymology
The genus name Lindera was published by Carl Peter Thunberg in 1783 and honors the Swedish physician Johan Linder (1676–1724). The name has been formally conserved (nom. cons.) under the rules of botanical nomenclature, preserving it against earlier competing names. Several of the synonyms now subsumed under Lindera — including Benzoin, Benzoe, and Parabenzoin — preserve a separate naming tradition tied to the aromatic resin "benzoin" once associated with these plants, which survives in the species epithet of Lindera benzoin and in the common name "Benjamin bush."
Distribution
Lindera is centered in temperate and subtropical East and Southeast Asia. Its native range, as recorded by Plants of the World Online, extends across Asia to Queensland in northeastern Australia and from southeastern Canada through the central and eastern United States. China, Japan, Korea, the Himalayan region, and the forests of Southeast Asia together account for the bulk of the species. Only three species are native to eastern North America — L. benzoin, L. melissifolia, and L. subcoriacea — and these are commonly interpreted as relicts of a Tertiary forest flora that was once more widely distributed when the continent's climate was more humid.
Ecology
Lindera species are characteristic understory and forest-margin plants, occupying habitats from light shade beneath closed canopies to open clearings, but consistently requiring adequate moisture. Lindera benzoin grows in the understory of moist, rich woods in eastern North America, particularly over limestone-influenced soils, while L. melissifolia is restricted to seasonally inundated wetlands — shallow depression ponds, margins of cypress ponds, and low areas in bottomland hardwood forests. Because the genus is dioecious, pollination depends on male and female plants growing within range of insect pollinators; habitat fragmentation that isolates the sexes is a recurring conservation concern. Birds, including hermit thrush, disperse the drupes. In North America, Lindera foliage supports the larvae of the spicebush swallowtail, promethea silkmoth, eastern tiger swallowtail, and engrailed moth.
Cultivation
Several Lindera species are cultivated as ornamental shrubs for their fragrant early-spring flowers, glossy or lobed summer foliage, and yellow autumn color. Lindera benzoin, the most widely grown North American species, is hardy in USDA zones 4–9 and tolerates considerable shade — though plants in full sun grow denser and produce more abundant fruit. As with all dioecious genera, fruit set requires both male and female plants. Pondberry (L. melissifolia) is rarely cultivated and is threatened in part by laurel wilt disease (caused by the fungus Raffaelea lauricola, vectored by the redbay ambrosia beetle), which Lindera growers in the southeastern United States should be aware of.
Conservation
Conservation status varies sharply across the genus. Lindera melissifolia (pondberry) is listed as Endangered under the U.S. Endangered Species Act (since 1986) and ranked G3 (Vulnerable) by NatureServe; it is restricted to roughly 36 populations across the southeastern United States and has been extirpated from Louisiana and probably Florida. Major threats are wetland drainage for agriculture and forestry, habitat fragmentation preventing pollen flow between male and female plants, and laurel wilt disease. Despite producing fruit, pondberry populations show virtually no observed seedling recruitment, raising long-term genetic-diversity concerns. No Lindera species is currently listed in the Global Invasive Species Database.
Cultural uses
Lindera benzoin has the deepest documented record of human use in the genus. Cherokee, Creek, and Iroquois peoples used it medicinally, and early American land surveyors took its presence as a sign of fertile agricultural land. Modern foragers and cooks brew the leaves and buds into a citrus-spicy tea and use the dried fruits as an allspice substitute. Across the genus, dried Lindera fruits have been used as a spice, and several species contain dicentrine — an alkaloid that modulates TRP ion channels and has drawn pharmacological attention.
Taxonomy notes
Lindera sits in the laurel family, Lauraceae. The accepted name as recognized by POWO is Lindera Thunb., published in Nova Genera Plantarum 3: 44 (1783) and conserved; GBIF cites the authorship as "(Adans.) Thunb." reflecting Thunberg's reuse of Adanson's earlier name. POWO accepts 94 species in the genus and lists 11 heterotypic synonyms: Aperula, Benzoe, Benzoin, Calosmon, Daphnidium, Evelyna, Omphalodaphne, Ozanthes, Parabenzoin, Polyadenia, and Sinosassafras. The type species is Lindera umbellata. Wikipedia gives a broader estimate of 80–100 species depending on circumscription.
