in·flo·res·cence 
(ĭn′flə-rĕsəns)
(ĭn′flə-rĕsəns)n.
1. A cluster of flowers arranged in a characteristic way on a stem.
2. The process of flowering.
[New Latin īnflōrēscentia, from Late Latin īnflōrēscēns, īnflōrēscent-, present participle of īnflōrēscere, to begin to flower : Latin in-, intensive pref.; see IN-2 + Latin flōrēscere, to begin to blossom; see FLORESCENCE.]
in′flo·rescent adj.
inflorescencetop left to right: umbel and corymb
bottom left to right: panicle and raceme