Darcy J. Broody and Kenneth M. Klemow 1988. SEED PRODUCTION AND EARLY SEEDLING SURVIVAL IN ECHIUM VULGARE L. (BLUEWEED). Contributed paper: Pennsylvania Academy of Science meeting. Abstract: Journal of the Pennsylvania Academy of Science 62:41.
Size variability among individuals in a population has been attributed to variability in age and to environmental heterogeneity. In this study, we seek to determine whether phenomena associated with seed formation, especially position on the parent plant, create variability in the size of the seedlings. Mature individuals of Echium vulgare growing along an abandoned railroad bed near Wilkes-Barre, PA, were collected in September, 1986. The number and position of flowers on each plant, and the number of seeds (nutlets) per flower were determined. Seeds were harvested, with their position on the plant being noted. After weighing, the seeds were sown on sterilized soil and watered daily. The date of emergence and rate of growth of each seedling was recorded. There was considerable variability in the weight of seeds, their rate of emergence and rate of seedling growth. Correlations between seed size, location, germination and seedling growth will be discussed.