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Ka'a He'ê is a phanerogamic plant, dicotyledonous,
and belongs to the campanile order of the compositae family
and was first classified in 1899 by the Swiss Botanist Moisés
S. Bertoni who, starting off from a small deficient and
incomplete flowering sample, completed the first systematic
study of the plant denominated as "Empatorium Rebaudianum
Bert."(1)
This name was given in homage to the Paraguayan chemist
Ovidio Rebaudi who had undertaken the first chemical analysis
in 1905 from a live plant that had bloomed. Bertoni later
undertook a revision of his first studies and realised that
it was an Eupatorium plant, but of the Stevia gender, and
published it as such (2). Since then it is known with the
name of Stevia Rebaudiana Bertoni.
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