Advanced Plant ID: Leaf Morphology

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A complete set of ORH3513 vocabulary flashcards covering leaf arrangements, shapes, margins, bases, apices, venation, and complexity based on botanical lecture slides.

Last updated 3:36 PM on 6/2/26
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85 Terms

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Opposite (Leaf Arrangement)

A leaf arrangement where two leaves are produced at the same node on opposite sides of the stem.

<p>A leaf arrangement where two leaves are produced at the same node on opposite sides of the stem.</p>
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Alternate (Leaf Arrangement)

A leaf arrangement where a single leaf is produced at each node, alternating sides along the stem.

<p>A leaf arrangement where a single leaf is produced at each node, alternating sides along the stem.</p>
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Whorled (Leaf Arrangement)

A leaf arrangement characterized by three or more leaves radiating from a single node.

<p>A leaf arrangement characterized by three or more leaves radiating from a single node.</p>
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Acute (Leaf Apex)

A leaf apex ending in a sharp point with an angle of less than 90∘90^{\circ}.

<p>A leaf apex ending in a sharp point with an angle of less than $$90^{\circ}$$.</p>
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Acuminate (Leaf Apex)

A leaf apex that tapers to a long, S-shaped, slender point.

<p>A leaf apex that tapers to a long, S-shaped, slender point.</p>
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Obtuse (Leaf Apex)

A leaf apex that is blunt or rounded with an angle greater than 90∘90^{\circ}.

<p>A leaf apex that is blunt or rounded with an angle greater than $$90^{\circ}$$.</p>
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Rounded (Leaf Apex)

A leaf apex that forms a smooth, continuous curve without a point.

<p>A leaf apex that forms a smooth, continuous curve without a point.</p>
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Mucronate (Leaf Apex)

A leaf apex that ends abruptly in a short, small continuation of the midvein.

<p>A leaf apex that ends abruptly in a short, small continuation of the midvein.</p>
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Oblique (Leaf Base)

A leaf base that is asymmetrical or lopsided, with one side reaching the petiole at a different point than the other.

<p>A leaf base that is asymmetrical or lopsided, with one side reaching the petiole at a different point than the other.</p>
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Rounded (Leaf Base)

A leaf base that is curved or circular in shape.

<p>A leaf base that is curved or circular in shape.</p>
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Cuneate (Leaf Base)

A leaf base that is wedge-shaped, tapering to the petiole.

<p>A leaf base that is wedge-shaped, tapering to the petiole.</p>
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Attenuate (Leaf Base)

A leaf base that tapers in an S-shape gradually to a very narrow point near the petiole.

<p>A leaf base that tapers in an S-shape gradually to a very narrow point near the petiole.</p>
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Acute (Leaf Base)

A leaf base that tapers to a sharp point with an angle equal to or less than 90∘90^{\circ} .

<p>A leaf base that tapers to a sharp point with an angle equal to or less than $$90^{\circ}$$ .</p>
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Obtuse (Leaf Base)

A wide leaf base that has a visible angle, which is greater than 90∘90^{\circ}

<p>A wide leaf base that has a visible angle, which is greater than $$90^{\circ}$$ </p>
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Elliptic (Leaf Shape)

A leaf shape that is widest at the middle and tapers equally toward both ends.

<p>A leaf shape that is widest at the middle and tapers equally toward both ends.</p>
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Ovate (Leaf Shape)

An egg-shaped leaf that is 2x longer than it is wide, and widest below the middle.

<p>An egg-shaped leaf that is 2x longer than it is wide, and widest below the middle. </p>
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Lanceolate (Leaf Shape)

A leaf shape that is 3x longer than it is wide, and is widest below the middle

<p>A leaf shape that is 3x longer than it is wide, and is widest below the middle</p>
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Oblong (Leaf Shape)

A leaf shape that is longer than wide with sides that are nearly parallel.

<p>A leaf shape that is longer than wide with sides that are nearly parallel.</p>
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Entire (Leaf Margin)

A leaf margin that is smooth and continuous, without teeth or lobes.

<p>A leaf margin that is smooth and continuous, without teeth or lobes.</p>
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Serrate (Leaf Margin)

A leaf margin with sharp, forward-pointing teeth like a saw.

<p>A leaf margin with sharp, forward-pointing teeth like a saw.</p>
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Crenate (Leaf Margin)

A leaf margin with shallow, rounded teeth or a scalloped edge.

<p>A leaf margin with shallow, rounded teeth or a scalloped edge.</p>
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Dentate (Leaf Margin)

A leaf margin with sharp teeth that point outward at right angles to the margin.

<p>A leaf margin with sharp teeth that point outward at right angles to the margin.</p>
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Palmately Lobed (Leaf Margin)

A leaf margin where the lobes radiate from a common point at the base of the leaf with an indentation of <50%< 50\%.

<p>A leaf margin where the lobes radiate from a common point at the base of the leaf with an indentation of $$ < 50\% $$.</p>
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Obovate (Leaf Shape)

A leaf shape that is wider at the tip than at the base.

<p>A leaf shape that is wider at the tip than at the base.</p>
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Decussate (Leaf Arrangement)

An opposite leaf arrangement where each successive pair of leaves is at a right angle to the previous pair.

<p>An opposite leaf arrangement where each successive pair of leaves is at a right angle to the previous pair.</p>
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Distichous (Leaf Arrangement)

An arrangement where leaves are in two vertical rows on opposite sides of the stem; can be alternate or opposite.

<p>An arrangement where leaves are in two vertical rows on opposite sides of the stem; can be alternate or opposite.</p>
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Peltate (Leaf Attachment)

A leaf attachment where the petiole is attached to the center of the leaf blade rather than the margin.

<p>A leaf attachment where the petiole is attached to the center of the leaf blade rather than the margin.</p>
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Equitant (Leaf Arrangement)

A leaf arrangement where leaves are folded and overlap each other in two ranks at the base.

<p>A leaf arrangement where leaves are folded and overlap each other in two ranks at the base.</p>
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Undulate (Leaf Margin)

A leaf margin that is wavy in a 3D vertical plane.

<p>A leaf margin that is wavy in a 3D vertical plane.</p>
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Oblanceolate (Leaf Shape)

A leaf shape that is long, but still widest above the middle towards the apex, and tapers toward the stem.

<p>A leaf shape that is long, but still widest above the middle towards the apex, and tapers toward the stem.</p>
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Cleft (Leaf Apex)

A leaf apex that is partly split or divided down the middle.

<p>A leaf apex that is partly split or divided down the middle.</p>
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Caudate (Leaf Apex)

A leaf apex that ends in a tail-like appendage.

<p>A leaf apex that ends in a tail-like appendage.</p>
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Simple (Leaf Complexity)

A leaf with a single, undivided blade.

<p>A leaf with a single, undivided blade.</p>
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Odd Pinnately Compound (Imparipinnate) (Leaf Complexity)

A compound leaf with leaflets arranged on both sides of a rachis and ending with a single terminal leaflet.

<p>A compound leaf with leaflets arranged on both sides of a rachis and ending with a single terminal leaflet.</p>
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Odd Bipinnately Compound (Leaf Complexity)

A twice-pinnate leaf that ends with a single terminal leaflet.

<p>A twice-pinnate leaf that ends with a single terminal leaflet.</p>
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Palmately Compound (Digitate) (Leaf Complexity)

A compound leaf where all leaflets are attached at a single point at the tip of the petiole.

<p>A compound leaf where all leaflets are attached at a single point at the tip of the petiole.</p>
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Cordate (Leaf Shape)

A heart-shaped leaf with notch at the base.

<p>A heart-shaped leaf with notch at the base.</p>
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Cordate (Leaf Base)

A heart-shaped leaf base with notch at base.

<p>A heart-shaped leaf base with notch at base. </p>
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Subulate/Awl (Leaf Shape)

A leaf shape that is awl-shaped, tapering from a broad base to a sharp point.

<p>A leaf shape that is awl-shaped, tapering from a broad base to a sharp point.</p>
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Serrulate (Leaf Margin)

A leaf margin with very small, fine serrations (teeth).

<p>A leaf margin with very small, fine serrations (teeth).</p>
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Truncate (Leaf Base)

A leaf base that appears to be cut off nearly straight across.

<p>A leaf base that appears to be cut off nearly straight across.</p>
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Truncate (Leaf Apex)

A leaf apex that appears to be cut off nearly straight across.

<p>A leaf apex that appears to be cut off nearly straight across.</p>
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Retuse (Leaf Apex)

A leaf apex with a shallow notch in a broad, blunt end.

<p>A leaf apex with a shallow notch in a broad, blunt end.</p>
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Emarginate (Leaf Apex)

A leaf apex featuring a distinct notch or indentation at the tip.

<p>A leaf apex featuring a distinct notch or indentation at the tip.</p>
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Biserrate (Leaf Margin)

A leaf margin with double-serrate teeth, where the larger teeth also have smaller teeth on them.

<p>A leaf margin with double-serrate teeth, where the larger teeth also have smaller teeth on them.</p>
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Sinuate (Leaf Margin)

A leaf margin that is strongly wavy in a horizontal plane.

<p>A leaf margin that is strongly wavy in a horizontal plane.</p>
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Falcate (Leaf Shape)

A leaf shape that is curved or sickle-shaped.

<p>A leaf shape that is curved or sickle-shaped.</p>
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Acicular (Leaf Shape)

A needle-shaped leaf.

<p>A needle-shaped leaf.</p>
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Spadate (Leaf Attachment)

Refers to a specific type of leaf attachment described as spadate.

<p>Refers to a specific type of leaf attachment described as spadate.</p>
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Pinnately Lobed (Leaf Margin)

A leaf margin with lobes arranged on both sides of a central axis.

<p>A leaf margin with lobes arranged on both sides of a central axis.</p>
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Rachis

The main axis or central stalk of a compound leaf or a fern frond.

<p>The main axis or central stalk of a compound leaf or a fern frond.</p>
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Pinnule

The smallest division or secondary leaflet of a bipinnately compound leaf or fern.

<p>The smallest division or secondary leaflet of a bipinnately compound leaf or fern.</p>
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Rachilla

The secondary axis of a compound leaf or the central axis of a grass spikelet.

<p>The secondary axis of a compound leaf or the central axis of a grass spikelet.</p>
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Frond

The entire leaf of a fern, typically consisting of a stipe and pinnae.

<p>The entire leaf of a fern, typically consisting of a stipe and pinnae.</p>
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Stipe

The stalk or petiole of a fern frond.

<p>The stalk or petiole of a fern frond.</p>
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Pinna

A primary division or leaflet of a pinnately compound leaf or fern frond.

<p>A primary division or leaflet of a pinnately compound leaf or fern frond.</p>
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Trifoliolate (Leaf Complexity)

A compound leaf composed of exactly three leaflets.

<p>A compound leaf composed of exactly three leaflets.</p>
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Leaf (Complex Leaf)

The whole leaf.

<p>The whole leaf.</p>
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Petiole

The stalk that joins a (compound/complex) leaf blade to the stem.

<p>The stalk that joins a (compound/complex) leaf blade to the stem.</p>
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Leaflet

An individual, leaf-like part of a compound leaf.

<p>An individual, leaf-like part of a compound leaf.</p>
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Connate-perfoliate (Leaf Attachment)

A leaf attachment where the bases of two opposite leaves are fused together around the stem.

<p>A leaf attachment where the bases of two opposite leaves are fused together around the stem.</p>
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Even Pinnately Compound (Paripinnate) (Leaf Complexity)

A pinnately compound leaf that ends in a pair of leaflets rather than a single terminal one.

<p>A pinnately compound leaf that ends in a pair of leaflets rather than a single terminal one.</p>
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Perfoliate (Leaf Attachment)

A leaf attachment where the stem appears to pass through the leaf blade.

<p>A leaf attachment where the stem appears to pass through the leaf blade.</p>
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Revolute (Leaf Margin)

A leaf margin that is rolled downward or toward the underside.

<p>A leaf margin that is rolled downward or toward the underside.</p>
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Keeled (Leaf Surface)

A leaf surface with a longitudinal ridge resembling the keel of a boat.

<p>A leaf surface with a longitudinal ridge resembling the keel of a boat.</p>
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Involute (Leaf Margin)

A leaf margin that is rolled upward or toward the upper side.

<p>A leaf margin that is rolled upward or toward the upper side.</p>
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Ciliate (Leaf Margin)

A leaf margin fringed with fine hairs.

<p>A leaf margin fringed with fine hairs.</p>
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Flat (Leaf Surface)

A leaf surface that is level and horizontal without ridges or rolls.

<p>A leaf surface that is level and horizontal without ridges or rolls.</p>
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Arcuate (Leaf Venation)

Venation where secondary veins curve upward toward the leaf apex.

<p>Venation where secondary veins curve upward toward the leaf apex.</p>
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Linear (Leaf Shape)

A long and narrow leaf shape with sides that are nearly parallel.

<p>A long and narrow leaf shape with sides that are nearly parallel.</p>
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Palmate (Leaf Venation)

Venation where several main veins radiate from a single point at the leaf base.

<p>Venation where several main veins radiate from a single point at the leaf base.</p>
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Dichotomous (Leaf Venation)

Venation characterized by veins that repeatedly fork into two equal branches.

<p>Venation characterized by veins that repeatedly fork into two equal branches.</p>
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Reticulate (Leaf Venation)

Net-like venation where veins are interconnected.

<p>Net-like venation where veins are interconnected.</p>
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Pinnate (Leaf Venation)

Venation with a single primary vein (midrib) and secondary or lateral veins branching from it.

<p>Venation with a single primary vein (midrib) and secondary or lateral veins branching from it.</p>
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Parallel (Leaf Venation)

Venation where the main veins run parallel to each other and the leaf margin.

<p>Venation where the main veins run parallel to each other and the leaf margin.</p>
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Penni-parallel (Leaf Venation)

Venation where secondary veins are parallel to each other and branch off from a single midrib.

<p>Venation where secondary veins are parallel to each other and branch off from a single midrib.</p>
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Adaxial Surface

The upper surface of a leaf.

<p>The upper surface of a leaf.</p>
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Abaxial Surface

The lower surface of a leaf.

<p>The lower surface of a leaf.</p>
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Heterophyllous

A plant that produces different leaf shapes on the same individual.

<p>A plant that produces different leaf shapes on the same individual.</p>
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Hastate (Leaf Shape)

A spear-shaped leaf with two basal lobes that stick out, and edges dip back in towards the midvein.

<p>A spear-shaped leaf with two basal lobes that stick out, and edges dip back in towards the midvein.</p>
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Sagittate (Leaf Shape)

An arrow-shaped leaf with two basal lobes pointing backward toward the stem, and the edges don’t dip back in towards the midvein.

<p>An arrow-shaped leaf with two basal lobes pointing backward toward the stem, and the edges don’t dip back in towards the midvein. </p>
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Palmatifid (Leaf Margin)

A palmately divided leaf where the indentations are >50%> 50\% of the way to the base.

<p>A palmately divided leaf where the indentations are $$ > 50\% $$ of the way to the base.</p>
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Palmatisect (Leaf Margin)

A palmately divided leaf where the indentations are almost complete, reaching nearly to the base.

<p>A palmately divided leaf where the indentations are almost complete, reaching nearly to the base.</p>
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Pinnatisect (Leaf Margin)

A pinnately divided leaf with indentations reaching nearly to the midrib.

<p>A pinnately divided leaf with indentations reaching nearly to the midrib.</p>
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Even Bipinnately Compound (Leaf Complexity)

A twice-pinnate compound leaf that ends in a pair of leaflets with no single terminal leaflet.

<p>A twice-pinnate compound leaf that ends in a pair of leaflets with no single terminal leaflet.</p>