Cinchona macrocalyx is a species of flowering plant in the family Rubiaceae. It is a tree with papery leaves, red flowers, and capsule fruits. The species is native to Bolivia, Ecuador, and Peru.
Cinchona macrocalyx was described in 1829, and is listed as of Least Concern by the IUCN.
Taxonomy The name Cinchona macrocalyx was first validly published by Augustin Pyramus de Candolle in 1829, following an earlier invalid publication by José Antonio Pavón Jiménez.
Distribution Cinchona macrocalyx is native to the wet tropical biome of Bolivia, Ecuador (Bolívar), and Peru (Cajamarca). It grows in the Andes, at elevations of .
Description Cinchona macrocalyx is a tree that grows up to high, and around wide. The leaf stems are long. The leaves are papery when dry, elliptic to almost circular in shape, long, and wide. The upper surface of the leaves is glossy. The leaves may have domatia.
The calyx is long, and has long lobes. The corolla is reddish, long, and has lobes.
The fruit is a dehiscent, more or less ellipsoid to roughly spherical capsule, measuring long and wide. The endocarp is woody. The seeds are long, and wide.
Conservation In 2018, the IUCN assessed Cinchona macrocalyx as of Least Concern. It has a large, stable population, and faces no major threats.
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