Casasia is a genus of flowering plants in the family Rubiaceae (order Gentianales), placed in subfamily Ixoroideae and tribe Gardenieae. The genus was described by French botanist Achille Richard (A.Rich.), with Casasia calophylla designated as the type species. It is also known by the synonym Buttneria P.Browne.
These shrubs or small trees comprise ten accepted species native to the Caribbean region. The best-known member is the Seven-year Apple (Casasia clusiifolia), which is the only species whose range extends beyond the Caribbean into Florida, Bermuda, the Bahamas, and the Turks and Caicos Islands. Most other species are endemic to individual islands: several are restricted to Cuba (C. acunae, C. calophylla, C. jacquinioides, C. nigrescens), while others are found only in Hispaniola (C. domingensis, C. ekmanii, C. haitensis, C. samuelssonii) and Jamaica (C. longipes).
Taxonomically, some species now recognized in Casasia were formerly placed in related genera, including Genipa, Gardenia, and Randia, reflecting the complexity of Rubiaceae classification.
Distribution
The genus Casasia is native to the Caribbean region. Its ten accepted species are distributed across Cuba, Hispaniola (Dominican Republic and Haiti), and Jamaica, with one species — the Seven-year Apple (Casasia clusiifolia) — extending northward to Florida, Bermuda, the Bahamas, and the Turks and Caicos Islands. Most species are narrow endemics confined to a single island.
Taxonomy
Casasia belongs to the coffee family Rubiaceae (order Gentianales), within subfamily Ixoroideae and tribe Gardenieae. The genus was described by Achille Richard (A.Rich.), with Casasia calophylla as the type species. It is also known under the synonym Buttneria P.Browne. Several of its ten accepted species were historically classified under related genera — Genipa, Gardenia, and Randia — before being re-assigned to Casasia, reflecting the historical difficulty of generic delimitation within the Gardenieae tribe.
