Leaves
Leaf or leaflet base shape
The lower portion of a two-dimensional structure which is usually bounded by the lower 5-10% of the margins; or the bottom of three-dimensional structure.
acute | Margins straight to convex forming a terminal angle 45 -90 . |  |
attenuate | Acuminate with concave margins. |  |
cuneate | Margins straight to convex forming a terminal angle 45 -90 . |  |
hastate | Margins variable; lobe pointed; oriented outward or divergently in relation to petiole or midrib. |  |
narrowly cuneate | Margins straight to convex forming a terminal angle of less than 45 . | |
oblique | Having an asymmetrical base. |  |
obtuse | Margins straight to convex, forming a terminal angle more than 90 . |  |
rounded | Margins and apex forming a smooth arc. |  |
truncate | Cut straight across; ending abruptly almost at right angles to midrib or midvein. |  |