2-rowed phyllotaxy

With 2-rowed phyllotaxy, each node has only 1 leaf (alternate phyllotaxy) and the leaves are arranged in 2 rows and often protrude +/- horizontally from the stem (e. g. in Taxus – Yew). In many woody plants, a 2-rowed phyllotaxy can be found at branches growing in shadow, while a spiral phyllotaxy is developed at the more exposed branches.