Angiosperm Leaf Types, Phyllotaxy, and Plant Sexuality

A comprehensive set of vocabulary flashcards covering angiosperm leaf classifications (simple, compound, pinnate, palmate), phyllotaxy patterns, and plant reproductive sexualities (polygamous, monoecious, dioecious) based on lecture notes.

Simple Leaves

A type of leaf consisting of a single, undivided leaf blade (lamina), also called a single leaf, which bears a bud in the axile and is attached to the stem with a petiole.

Compound Leaves

Leaves consisting of many leaf blades, each having a small stalk of its own; the main petiole is known as the rachis and each blade is known as a leaflet.

Rachis

The main petiole of a compound leaf to which leaflets or secondary rachi are attached.

Leaflet

Each individual leaf blade of a compound leaf, typically possessing its own small stalk.

Pinnately Compound Leaves

A type of compound leaf where the leaflets are arranged on the rachis in a pinnate manner, occurring on both sides of the rachis in pairs.

Unipinnate Leaf

A pinnately compound leaf where leaflets are attached directly to the rachis; can be paripinnate or imparipinnate.

Paripinnate

A unipinnate leaf structure where the rachis ends in a pair of leaflets, as seen in Tamarindus.

Imparipinnate

A unipinnate leaf structure where the rachis ends in a single leaflet, as seen in Azadirachta (neem).

Bipinnate Leaf

A leaf type where the primary rachis bears a secondary rachis in a pinnate manner, and the leaflets are attached to the secondary rachis, such as in Caesalpinia, Acacia, and Cassia.

Tripinnate Leaf

A leaf containing primary, secondary, and tertiary rachi, with leaflets specifically attached to the tertiary rachis, as seen in Moringa.

Decompound Leaf

A leaf that is more than thrice pinnate, resulting in a shape that appears dissected, such as in Carrot and Coriander.

Palmately Compound Leaves

A type of compound leaf where all leaflets are arranged at the tip of the rachis.

Unifoliate Palmately Compound Leaf

A palmately compound leaf reduced to a single leaflet with a winged petiole, exemplified by Citrus.

Bifoliate Palmately Compound Leaf

A leaf consisting of exactly two leaflets, as seen in Bauhinia.

Trifoliate Palmately Compound Leaf

A leaf consisting of exactly three leaflets, as seen in Erythrina.

Quadrifoliate Palmately Compound Leaf

A leaf consisting of exactly four leaflets, as seen in Marsilea (water fern).

Multifoliate Palmately Compound Leaf

A leaf consisting of many leaflets arranged at the tip of the rachis, as seen in Bombax and Aesculus.

Phyllotaxy

Refers to the mode of arrangement of leaves at the nodes of the stem to ensure exposure to sunlight and air.

Alternate Spiral Phyllotaxy

A type where single leaves are attached at each node and arranged spirally, oriented at all angles of the stem, such as in Hibiscus.

Alternate Distichous Phyllotaxy

A type where leaves are attached to the left and right of the nodes, oriented only in two angles, as seen in Polyalthia.

Opposite Superposed Phyllotaxy

A type where a pair of leaves is attached to each node at the same angle, so successive pairs stand directly one above the other, as in Quisqualis.

Opposite Decussate Phyllotaxy

A type where successive pairs of leaves are attached at right angles to one another, resulting in leaves oriented in four vertical rows, as in Calotropis and Ixora.

Ternate Phyllotaxy

An arrangement where a group of three leaves occurs as a whorl at each node of the stem, as in Nerium.

Whorled Phyllotaxy

An arrangement where a group of four leaves occurs as a whorl at each node of the stem, as in Allamanda.

Mosaic Phyllotaxy

An arrangement of smaller and larger leaves in a pattern so that all leaves are equally exposed to sunlight, as in Acalypha.

Radical Phyllotaxy

A cluster of leaves arising from near ground level from a highly reduced subterranean stem, appearing to start directly from the root, as in Pineapple, Agave, Aloe, and Mollugo.

Polygamous

Plants that possess both bisexual and unisexual flowers on the same individual, such as Mangifera and Feronia.

Monoecious

A plant condition where separate male and female flowers are both present on the same plant, such as Coconut and Cucurbita.

Dioecious

A plant condition where male and female flowers are present on separate individuals, as seen in Palmyrah and Papaya.