Atalantia is a genus of flowering plants in the family Rutaceae (the citrus or rue family), order Sapindales. It belongs to the subfamily Aurantioideae — the same subfamily that contains the economically important genus Citrus — and is placed within the tribe Aurantieae, subtribe Citrinae. Together with the related genus Citropsis, Atalantia is sometimes grouped informally as "near-citrus fruit trees," reflecting its close evolutionary relationship to true citrus species.
The genus comprises shrubs and small trees with simple or unifoliolate leaves, fragrant flowers, and small citrus-like fruits. Its members are native primarily to tropical and subtropical Asia, with species recorded from South India, Sri Lanka, and Southeast Asia.
Atalantia has ecological significance as a host plant for several insects. The citrus leafminer moth (Phyllocnistis citrella), a serious agricultural pest of citrus crops, uses Atalantia as a larval host. The Noctuidae moth Macaldenia palumba also feeds on Atalantia as larvae. The blue Mormon butterfly (Papilio polymnestor), a large swallowtail found across South India and Sri Lanka, is associated with Atalantia as a larval food plant.
Notable species include Atalantia monophylla, a small thorny tree of southern India and Sri Lanka, and Atalantia buxifolia, native to coastal East and Southeast Asia.
Distribution
Atalantia is native to tropical and subtropical Asia, with its centre of diversity in South Asia and Southeast Asia. Species are recorded from South India, Sri Lanka, and coastal regions extending into Southeast Asia. Atalantia monophylla is characteristic of the Indian subcontinent and Sri Lanka; Atalantia buxifolia occurs in coastal East and Southeast Asia.
Ecology
Atalantia species serve as larval host plants for several insects. The citrus leafminer moth (Phyllocnistis citrella, family Gracillariidae) — a serious agricultural pest of commercial citrus — uses Atalantia as a host. The noctuid moth Macaldenia palumba also feeds on Atalantia in its larval stage. The blue Mormon butterfly (Papilio polymnestor), a large swallowtail native to South India and Sri Lanka, is found in association with Atalantia and uses it as a larval food plant.
Taxonomy Notes
Atalantia is placed in the subfamily Aurantioideae of Rutaceae, within tribe Aurantieae and subtribe Citrinae — the grouping that contains all true citrus fruit trees. It is considered a "near-citrus" genus alongside Citropsis, meaning it is phylogenetically close to but distinct from Citrus. The circumscription of Atalantia has shifted over time; several species formerly included in the genus have been moved to related genera as molecular systematics has refined the boundaries of the citrus subtribe.
