A B S T RAe T Serological techniques of double diffusion (Ouchterlony) and nephelometry (Boyden Procedure) were employed to analyze the serological correspondence of taxa belonging to the Caprifoliaceae with selected taxa belonging to the Rubiaceae and the Cornaceae. Comus (Cornaceae) exhibited relatively high correspondence with most representatives of the Caprifoliaceae, especially with Sambucus. The correspondence of Viburnum with Comus was low. The serological correspondence of genera of the Caprifoliaceae with three genera of the Rubiaceae was relatively low indicating that these two families are serologically distinct. The correspondence between the Caprifoliaceae and the Cornaeeae suggests a closer relationship between these two families than between the Caprifoliaceae and the tested. genera of the Rubiaceae. These limited data suggest that the Rubiaceae and the Caprifoliaceae should not be placed in one taxonomic order. However, the serological variation for additional taxa within the Rubiaceae must be ascertained before more conclusive statements can be made relative to the degree of serological similarity between the two families.
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