Kenneth G. Wilson (1923). The Columbia Guide to Standard American English. 1993.
stamen, stamina (nn.)
The regular -s plural for stamen, the pollen-producing part of a flower, is stamens. Stamina, the Latin plural of stamen, meaning a thread in the warp of human life spun by the Fates, is a singular English noun, meaning endurance. Both words are Standard, from the same etymon. See FOREIGN PLURALS.