Pinnate-leafed plants have leaves that are arranged in a feather-like formation along a central stem. To describe these plants, you can use synonyms such as feather-leaved, fern-like, frondescent, or feathery. Another way to describe these plants could be to use different terms for the shape or arrangement of their leaves. For example, you could say they have "striated" or "serrated" leaves, which refer to the presence of ridges or serrations along the edges of the leaves. Alternatively, you might describe them as having "compound" leaves, which refers to the structure of leaves composed of multiple smaller leaflets.