What is the fine-grained topic of the following text: Leaves alternate, 10-30 mm mm long, 12-30 mm mm wide, hairy, on the abaxial surface, the hairs straight; lamina flat, clearly widest above the middle, once divided, tripartitely divided or divided only at the apex, shallowly divided or divided to the midrib; lobes 7-15 mm long, 1-1.5 mm wide, the margins recurved. Only return the topic.
Leaf characteristics and morphology