corymb: flat-topped or convex inflorescence in which the individual flower stalks grow upward from various points on the main stem to approximately the same height; outer flowers open first
inflorescence: the flowering part of a plant or arrangement of flowers on a stalk
starch: a complex carbohydrate found chiefly in seeds, fruits, tubers, roots and stem pith of plants, notably in corn, potatoes, wheat, and rice; an important foodstuff and used otherwise especially in adhesives and as fillers and stiffeners for paper and textiles