What do you call many flowers on one stem?
A florist calls many flowers on one stem a "spray"; for example
spray mums or spray roses.
A botanist would call a number of flowers on one stem an
"inflorescence" and then use other words to describe how exactly
the flowers are arranged on the stem, such as "spike" (ex.
snapdragons), "panicle" (ex. blue flax) or "umbel" (ex.