Abstract
When seed production following selfand cross-pollination is similar, a species is usually regarded as self-compatible. On this basis, Ray and Chisaki (1957a) reported that the distylous species of Amsinckia (Boraginaceae) are either fully or partly self-fertile. The combination of floral heteromorphism and self-compatibility is unusual, since most heteromorphic species that have been studied are selfincompatible (Vuilleumier, 1967). Recent pollen flow studies of Amsinckia grandiflora Kleeb. indicate that pollinations of this species include a large proportion of intramorph pollination (Ornduff, 1976). However, in two out of three years, samples in a population revealed that the two morphs occurred in equal numbers, which in a selfcompatible distylous species would suggest a high rate of outcrossing. These observations led us to investigate the possibility that this species possesses a cryptic incompatibility system. This possibility was investigated by studies of progeny resulting from natural and artificial pollinations, pollen competition studies, and pollen tube growth studies.
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