acotyledonous
Definition
Adjective (Botany): Describing a plant that has no cotyledons (seed leaves). In botanical classification, "acotyledonous" refers to plants whose embryos lack distinct seed leaves, such as certain lower plants (e.g., mosses, ferns, and some algae).
Usage Examples
- (Ferns have embryos without seed leaves.)
- (Mosses lack seed leaves during germination.)
- (Historical classification based on absence of cotyledons.)
Advanced Usage
- "Acotyledonous embryo": an embryo lacking cotyledons, typical of cryptogams (non-flowering plants).
- The acotyledonous embryo of a fern develops directly into a prothallus. (The embryo has no seed leaves and grows into a primitive structure.)
- "Acotyledonous plant": a plant that never produces true cotyledons during its life cycle.
- Liverworts are acotyledonous plants that reproduce via spores. (Liverworts lack seed leaves entirely.)
Variants and Related Words
- Acotyledon (noun): a plant that has no cotyledons; a member of the group Acotyledones.
- The acotyledon is a term used in older botanical systems for non-flowering plants. (A plant without cotyledons.)
- Cotyledonous (adjective): having cotyledons (opposite of acotyledonous).
- Most flowering plants are cotyledonous, with either one or two seed leaves. (Plants with seed leaves.)
- Dicotyledonous (adjective): having two cotyledons.
- Beans are dicotyledonous plants. (They have two seed leaves.)
Synonyms
- Non-cotyledonous: lacking seed leaves.
- Cryptogamous (in older usage): referring to plants that reproduce by spores and lack true seeds or cotyledons.
Related Idioms and Phrases
- "Acotyledonous group": a historical classification category for plants without cotyledons.
- Linnaeus's system included an acotyledonous group for ferns and mosses. (A grouping based on absence of seed leaves.)
Antonyms
- Cotyledonous: having cotyledons.
- Dicotyledonous: having two cotyledons.
- Monocotyledonous: having one cotyledon.