dichotomous sympodium二叉状假轴分枝
monopodial sympodium单轴型合轴
uninodal sympodium单节合轴
N（名词） the main axis of growth in the grapevine and similar plants: a lateral branch that arises from just behind the apex of the main stem, which ceases to grow, and continues growing in the same direction as the main stem 合轴 → compare monopodium