
Northern Ontario Plant Database
Leaf Bases
 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 wedgeshaped 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 (earlike) lobes.
 Hastate  a base with pointed lobes directed outwards.
 Sagittate  a base with pointed lobes directed downwards.
 Divergent  a base with short, straightsided lobes directed outward.
