复伞房花序;
This genus' evolutionary direction: the number of winter bud scale is from many to two, inflorescence: compound raceme → compound corymb → corymb → umbel.
本属的进化趋势为冬芽芽鳞由数枚减少到2枚,花序由总状圆锥花序→复伞房花序→伞房花序→伞形花序。
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