Revoluta (Latin, feminine singular, nominative case), or its masculine form revolutus and neuter form revolutum, is a Latin adjective frequently used in biological nomenclature to describe a particular morphological characteristic.
Etymology The word derives from the Latin verb revolvere, meaning "to roll back," "to unroll," or "to turn over." Its adjectival form, revolutus, thus describes something that has been rolled back, turned back, or recurved.
Botanical Usage In botany, "revoluta" is widely employed as a specific epithet (the second part of a scientific name) or as part of a genus name to indicate a characteristic where the margins of a leaf, petal, or other plant part are rolled or curled downwards and backwards towards the abaxial (lower) surface. This contrasts with "involuta," where margins are rolled upwards and inwards towards the adaxial (upper) surface.
Examples of species using this epithet include:
- Cycas revoluta (Sago Palm): Named for its leaves, whose margins are distinctly rolled back.
- Rhapis revoluta (Lady Palm): Often referring to the leaflets having revolute margins.
- Juniperus communis 'Revoluta': A cultivar name indicating this characteristic.
This descriptive term is crucial for distinguishing species and understanding plant morphology, as the orientation of leaf or petal margins can be a key taxonomic feature.
Other Scientific Usage While most prominent in botany, the term "revolute" (derived from revoluta/revolutus) can also appear in other scientific fields to describe structures that are curled or rolled backward, such as in zoology when describing shell margins or anatomical features.