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Term	Definition
Leaf base obtuse	Blunt, referring to the the base of a leaf blade in which the two sides are straight and, when they meet, form an angle greater than 90°.
Leaf base rounded	Referring to a leaf blade base that is curved at the apex with an angle greater than 90 degrees at the point where the two sides meet.
Leaf base sagittate	The base of a leaf blade shaped like an arrowhead.
Leaf base truncate	Referring to the base of a leaf blade that terminates abruptly in a nearly straight horizontal edge.
Leaf blade	The expanded portion of a leaf, it and the petiole combined equal the leaf. Same as lamina.
Leaf flush	The expansion of new leaves.
Leaf flush	The expansion of new leaves.
Leaf gap	A region of parenchyma in the vascular tissue of a stem that is located above the level where a leaf trace diverges from the stem toward the leaf.
Leaf lamina	The expanded portion of a leaf, it and the petiole combined equal the leaf. Same as leaf blade.
Leaf margin crenate	Referring to a leaf blade margin with teeth rounded at the apex. Compare with serrate.
Leaf margin dentate	Referring to a leaf margin with sharp teeth oriented at right angles to the central axis of the leaf blade.
Leaf margin doubly serrate	Leaf blades with margins with sharp teeth oriented toward the apex with each touth in turn with a smaller tooth.
Leaf margin entire	Referring to leaf blade margins that are smooth, i.e., they have no serrations or crenations.
Leaf margin erose	Referring to leaf blade margin that is jagged, i.e., uneven but not with well-defined teeth.
Leaf margin lobed	Referring to rounded projections arising from the margins of a leaf blade that are cut less than one-half the distance to the midrib of the leaf blade, e.g., the leaves of the white oak group.
Leaf margin serrate	Leaf blades with margins with sharp teeth oriented toward the apex.
Leaf opposed	Referring to an inflorescence, infructescence, or tendril arising from the stem opposite a leaf.
Leaf scar	The scar left on a stem when a leaf falls.
Leaf sheath	Tubular, inrolled base of a leaf blade or petiole that surrounds the node and a portion of the internode; e.g., in the Cyperaceae, Poaceae, and many other monocotyledons as well as in some dicotyledons.
Leaf symmetrical	Referring to the form of a leaf with the blade equal on each side of the midrib.
Leaf symmetry	Referring to the form of a leaf in relation to the midrib, if the blade on each side of the midrib is equal the leaf is symmetrical and if the blades on each side of the midrib are not equal the leaf is asymmetrical.
Leaf venation acrodromous	Referring to a type of leaf venation in which two or more primary or strongly developed secondary veins arch upward from either the base or above it; perfect acrodromous is used when these veins converge near the apex; e.g., Strychnos (Loganiaceae); imperfect acrodromous is used when these veins do not converge at the apex. Based on Hickey, 1973. For more information about leaf venation see Ellis et al, 2009.
Leaf venation actinodromous	Referring to a type of leaf venation in which three or more primary veins diverge radially from a single point either at (basal actinodromous) or above (suprabasal actinodrmous) the point of attachment of the petiole. The primary veins can either converge at the apex (perfect actinodromous) or not converge at the apex (imperfect actinodromous). Based on Hickey, 1973. For more information on leaf venation see Ellis et al., 2009.
Leaf venation basal acrodromous	Referring to a type of leaf venation in which two or more primary or strongly developed secondary veins arch upward from the base and converge at or close to the apex.. Based on Hickey, 1973. For more information about leaf venation see Ellis et al, 2009.
Leaf venation basal actinodromous	Referring to a type of leaf venation in which three or more primary veins diverge radially from a single point at point of attachment of the petiole.

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