What plant containing single-seeded, blue-black drupes is part of the Manilkara zapota family?
Sideroxylon celastrinum Sideroxylon celastrinum is a species of flowering plant in the sapodilla family, Sapotaceae, that is native to Texas and Florida in the United States south through Central America to northern Venezuela and Colombia in South America. Common names include saffron plum and coma. It is a spiny shrub or small tree that reaches a height of 2 - . The dark green leaves are alternate or fascicled at the nodes and oblanceolate to obovate. Greenish-white flowers are present from May to November and are followed by single-seeded, blue-black drupes.
Commelina lukei Commelina lukei is a monocotyledonous, herbaceous plant in the dayflower family from East Africa. This blue-flowered herb has been recorded in lowland areas of Kenya, Tanzania (including Zanzibar), and Madagascar, where it is found in a variety of habitats ranging from forests to grasslands to roadsides. Described in 2008, the species was previously confused with "Commelina mascarenica" and "Commelina imberbis". Despite this misinterpretation, a third similar species, "Commelina kotschyi", is actually most closely related to "C. lukei". The plant's distinctive features include a scrambling habit, capsules with a rounded extension at the apex, appendaged seeds, clasping leaf bases throughout, and solely needle-like hairs along the upper side of the leaf's midrib. The species was named in honour of the botanist W. Q. R. Luke, whose collection of the plant served as the type specimen and allowed for a complete illustration and description.