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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Showing 368 definitions
Synonyms: Monocot, Monocots, Monocotyledons

Monocotyledon A monocotyledon (commonly referred to as a monocot) is a flowering plant that begins life with a single seed leaf, known as a cotyledon. Monocots typically have long, narrow leaves with parallel veins, flower parts in multiples of three, and fibrous root systems. Common examples include grasses, lilies, orchids, palms, and many garden flowers. Did You Know? Many of the plants we use every…

Synonyms: Monotypics

Monotypic Referring to a genus that has but one species. This term helps classify plants so they can be identified and discussed clearly. Did you know? Ginkgo biloba is the only living species in its genus and one of the most isolated trees on Earth.

Synonyms: Mycelia, mycelia

Mycelium The thread-like portion of a fungus, excluding the fruiting or reproductive structures. They may or may not be visible. Groups of strands may join to form thick strands called rhizomorphs Did you know? Mycorrhizal mycelium connects plant roots underground and helps many trees obtain water and nutrients.

Synonyms: Nectaries, Nectars, Nectary

Nectar A sugary, sticky fluid secreted by many plants. This feature helps describe plant form, function, or identification. Did you know? Honey begins as flower nectar collected by bees and concentrated inside the hive.

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