A genus of flowering plants in the family Rubiaceae, native to tropical America.
From Greek 'exo-' (outside) + 'stema' (stem/covering), referring to the external structure of the plant's reproductive organs. Named and classified in botanical taxonomy during the 18th-19th century.
Exostema species are sometimes called 'horse sugarplum' or 'prince wood,' and they're used in traditional medicine throughout the Caribbean and Central America despite being relatively unknown outside the tropics.
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