Sunflower Seeds A sunflower seed is the seed of a sunflower (Helianthus annuus). There are three commonly used types of sunflower seeds: linoleic (the most common), high oleic, and sunflower oil seeds. Related Articles: Redpoll (Acanthis SPP) Species Guide: Appearance, Diet, Habitat, Behavior, Stats, And Conservation StatusGlossary: Nyjer SeedGlossary: Coal TitGlossary: Bird Feeder