Sunflower Production - NDSU Agriculture - North Dakota State ...

Petiole — The stalk of the leaf.pH — Expression of acidity or alkalinity of soil orwater.Physiological Maturity — Stage at which a seedhas reached its maximum dry weight.Pollinator — Insect that carries pollen from plantto plant.Pupa (pl. pupae) — The stage between larva andadult in some insects.Ray Flower — Flattened, ray shaped flowers onmargins of sunflower head. Commonly referred toas the petals. These are sterile and do not produceachenes.Receptacle — Fleshy, thickened part of sunflowerhead just above the stem that bears the flowerparts.Sclerotium (pl. sclerotia) — The hard, restingbodies of certain fungi.“Seed” — True seed in sunflower is the kernel;however, “seed” commonly is used to describethe kernel plus hull, which is equivalent to theachene.Self Compatability — Production of fruits andnormal seeds following self pollination.Sporea — Reproductive structure of fungi.Sunflower — The preferred term, equivalent tosunflowers.Sun Oil — The preferred term, equivalent tosunflower oil, sunflower seed oil.Variety — A subdivision of a species; a distinctgroup of organisms.Volunteer Plant — Plant arising from seeddispersed from a previous crop.116