Provided by "Sharon Yiesla, Horticultural Services"
Umbel: An inflorescence (often flat-topped) with the flower stalks arising from a single point on the peduncle (inflorescence stalk) and resembling the spokes of an umbrella. Example: dill, Queen Anne’s lace.
Valvate: for buds, the scales meeting by the edges without overlapping
Whorl: Arrangement of three or more leaves at a node. Also a ring of floral structures.