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Complete survivorship and fecundity schedules were constructed from observations of a natural population of the winter annual Phlox drummondii. The data were collected through the complete generation of a cohort of individuals, including the dormant seed phase of the life cycle. Survivorship is shown to approach type II during the period of seed dormancy and to approach type I for the population after germination. Reproduction was found to be unevenly distributed among individuals, the majority of offspring being produced by a small fraction of the cohort. Estimates of the net reproductive rate R0 and the intrinsic rate of increase r are compared with those of other organisms. The rates are lower than those expected of colonizing or r-selected species. It is suggested that certain annual plants like P. drummondii may have acquired a shortened generation length, but lack the further demographic specialization of many annuals as fugitives or weeds.

Age-Specific Survivorship and Reproduction in Phlox drummondii