Arboretum Botanical Glossary

A botanical reference guide of morphological terms, plant structures, propagation techniques, and campus flora definitions.

368 Botanical Definitions 10 Categories A–Z Alphabetical Index Illustrated Growth Forms

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Explore terms organized by botanical structure, morphology, and arboricultural concepts.

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Illustrated Growth Forms & Tree Silhouettes

Compare visual architectures: fastigiate, columnar, weeping, spreading, and more.

Fastigiate Columnar Pendulous / Weeping
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Synonyms: Ligules

Ligule A strap-shaped organ. This feature helps describe plant form, function, or identification. Did you know? Grass specialists often identify grasses by the ligule at the junction of the leaf blade and sheath.

Synonyms: Lobes

Lobe A projecting portion or segment, usually referring to a leaf Did you know? Maple and oak leaves are easy to recognize partly because of their distinctive lobes and sinuses.

Synonyms: Locular, Loculars, Locules, Loculicidal, Loculicidals

Locule A seed-containing cell within a fruit or the pollen-containing compartment within an anther. Did you know? Tomato seed chambers are locules; each juicy section contains seeds attached to the inner fruit wall.

Synonyms: Margins

Margin Edge, usually referring to a leaf. Botanists use this feature to describe leaf shape, surface, edge, or arrangement, which helps with plant identification.

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