Abstract
Fourteen common southern Spanish species in theCistaceae were examined for quantitative variations in floral traits. These included the diameter of the corolla, number and size of anthers, number of ovules, and the size and shape of the gynoecium. The variables were in most instances positively correlated, species with larger flowers having more and larger anthers, more ovules, etc. Shrubs were observed to possess the largest, annuals the smallest, and subshrubs medium-sized flowers. Detailed observations of flower structure and function in a shrub (Cistus salvifolius), a spring-annual (Tuberaria guttata) and a winter-annual (T. inconspicua), revealed substantial variations in the breeding system. WhileC. salvifolius (and probably most woody species in this family) presents self-incompatibility, annual species ofTuberaria are self-compatible. In the studied population,T. inconspicua plants bore only reduced, cleistogamous flowers with no sign of a corolla.T. guttata has chasmogamous flowers that can facultatively self-pollinate.
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