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Glossary of commonly used botanical terms and their definitions. Use the search bar below to look up a botanical term.

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15 Random Botanical Terms

Twig - A small branch.

Aril - An outer covering or appendage of some seeds.

Subshrub - Shorter than a shrub, often weakly woody and persisting for only a few years.

Obtuse - Blunt or rounded at the tip.

Prostrate - Lying flat on the ground.

Hastate - A triangle with two sides abruptly concave; in the form of two pointed lobes pointing outwards.

Actinomorphic - Refers to flowers that can be divided into equal halves along any axis (radially symmetric).

Petiolule - The stalk of the leaflet of a compound leaf.

Herb - A plant species lacking woody tissue when mature.

Oblanceolate - Inversely lanceolate with top wider than bottom.

Orbicular - Circular or nearly so.

Scabrous - Rough to the touch.

Sepals - Parts that surround the petals, stamens, and pistil; usually green and leaflike. Sometimes they are the same size, shape, and color as the petals; as in Cooperia pedunculata (rain lily), in which case both sepals and petals are called sepals.

Rhizobium - Soil-borne bacteria which form nitrogen-rich root nodules.

Needle - The long and narrow leaf of pines and related species.