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MATING SYSTEM VARIATION IN FESTUCA MICROSTACHYS

Festuca microstachys Nutt. (small fescue) is a small annual grass endemic to western North America and found most commonly on dry, rocky, exposed sites at elevations ranging from sea level to 1,830 m. Based on a study of nine northern California populations, Kannenberg and Allard (1967) concluded that small fescue is a highly self-fertilized species, with less than one fertilization in 1,000 likely to be the result of outcrossing. Despite this high level of inbreeding, F. microstachys appears to be little if any less variable genetically (both within and between populations) than other annual plant species with much higher outcrossing rates (Kannenberg and Allard, 1967; Adams, 1974; Adams and Allard, 1977). Since a great deal of variability has been reported in the mating systems of other annual species (see reviews of Brown [1979] and Clegg [1980]), it was of interest to determine whether variations in the mating system might contribute to the genetic variability in small fescue. This paper reports the results of a study of mating system variation in this species as based on phosphoglucose isomerase (PGI) allozymes.