形容詞 basipetal:

1. of leaves or flowers; developing or opening in succession from apex to base

ba.sip.e.tal

adj.Botany （形容詞）【植物學】
Of or relating to the development or maturation of tissues or organs or the movement of substances, such as hormones, from the apex downward toward the base.
向基的：與組織或器官的形成發(fā)展或與如荷爾蒙類物質運動有關的，從頂部向下往基部運動

【引伸】
basip.etally
adv.（副詞）