Enkianthus is a genus of 12–15 species of deciduous shrubs and small trees belonging to the heath family Ericaceae, order Ericales. The genus holds a distinctive place in botanical science as the most phylogenetically basal member of Ericaceae — meaning it represents the lineage that diverged earliest from the common ancestor of the entire family. This position has led to its placement as the sole genus of the subfamily Enkianthoideae.
The genus is native to Asia, ranging from the eastern Himalayas in the west across Indochina in the south to China and Japan in the north and east. Plants typically display pendant clusters of small, urn-shaped or bell-shaped flowers, and many species produce outstanding autumn foliage colour in shades of red, orange, and yellow, which makes them highly valued ornamental plants in temperate gardens worldwide.
Several species are cultivated widely, including Enkianthus campanulatus (redvein enkianthus), Enkianthus cernuus, and Enkianthus perulatus. The form E. cernuus f. rubens (drooping red enkianthus) has received the Royal Horticultural Society's Award of Garden Merit in recognition of its garden value.
Distribution
Enkianthus is native to Asia, with a range extending from the eastern Himalayas in the west through Indochina in the south to China and Japan in the north and east. The genus is absent from the Indian subcontinent west of the Himalayas and from the rest of the world.
Taxonomy Notes
Enkianthus is classified as the sole genus of the subfamily Enkianthoideae within Ericaceae. Phylogenetically it is considered the most basal member of the family — the lineage that separated first from the common ancestor of all Ericaceae — a position supported by molecular cladistic analyses. Twelve to fifteen species are recognised depending on the taxonomic authority consulted.
Cultivation
Several species of Enkianthus are popular in temperate ornamental gardens, grown for their pendant bell- or urn-shaped flowers in spring and for spectacular autumn leaf colour. Enkianthus campanulatus, E. cernuus, and E. perulatus are the most commonly cultivated. The selection E. cernuus f. rubens (drooping red enkianthus) has been awarded the Royal Horticultural Society's Award of Garden Merit.
