BIOLOGISCHE UND SYSTEMATISCHE BEDEUTUNG VON CHEMISCHEN RASSEN

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Abstract
The concept of chemical races (or chemodemes) is discussed from the botanical point of view. Chemodemes are defined as chemically distinct populations within a species. Chemodemes may – but need not – be simultaneously morphologically and (or) cytologically distinct. Very often chemodemes represent ecodemes ( = ecotypes) or topodemes (= topotypes). If we are predominantly interested in plant constituents chemically distinct populations within a species or aggregate species may adequately be called „chemical races” (or chemodemes). The race concept, however, is distinct from local polymorphism, i.e. genetically controlled chemical variation within a local population. The importance of chemical polymorphism for plant breeding and biological and taxonomic aspects of chemical polytypism (species with several chemodemes) are discussed and illustrated by a number of examples.

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