Northern Ontario Plant Database
- Attenuate - a tapering base with concave margins that form an angle less than (<) 45 degrees.
- Narrowly cuneate - a narrow base with straight or convex margins that form an angle less than (<) 45 degrees.
- Truncate - a broad straight base, abruptly ending at right angles to the midvein.
- Oblique - an asymmetrical base with unequal size lobes, attached to the midvein at different levels.
- Cuneate - a wedge-shaped base with margins that form an angle less than (<) 90 degrees, but greater than (>) 45 degrees.
- Obtuse - a blunt base with margins that form an angle greater than (>) 90 degrees.
- Rounded - a curved base with margins that form a smooth arc.
- Cordate - a base with prominent, rounded lobes, cut ½ to ¼ of the distance to the centre of the leaf blade.
- Auriculate - a base with small rounded (ear-like) lobes.
- Hastate - a base with pointed lobes directed outwards.
- Sagittate - a base with pointed lobes directed downwards.
- Divergent - a base with short, straight-sided lobes directed outward.