Indiana Nature Biology Glossary

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Terminal Bud: Also called "apical bud," it is the bud located on the outermost tip of a twig.

Terminal Leaflet(s): The final leaflet or leaflets at the outermost tip of a pinnately compound leaf. (See also lateral leaflets)

Terminal Line: In Lepidoptera, the outermost of the wing lines located near the outer margin.

Terminal line on large lace-border moth (Scopula limboundata)

Transpiration: The process of evaporative water loss through surface structures in plants. Transpiration occurs primarily in the stomata of leaves and the lenticels of stems.

Trifoliate: A compound leaf with three leaflets

Type Genus: In taxonomy, a genus that is the basis for the name of its family, subfamily, or tribe.

Laurel sphinx (Sphinx kalmiae)

Sphinx is the type genus for the tribe Sphingini, the subfamily Sphinginae and the family Sphingidae.
Photo courtesy of Chris Joll.

Type Species: Also called “nominal species,” in taxonomy, the species that is the basis for the description of its genus or subgenus. Taxonomists consider type species permanently attached to the genus or subgenus to which they belong.

Skunk cabbage (Symplocarpus foetidus) is the type species for the genus Symplocarpus.

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