Achlamydeous – Definition & Meaning

Achlamydeous is a term used in botany to describe flowers that lack petals and sepals. It is a word that is not commonly used in everyday language, but it is important for botanists and those interested in plant taxonomy.


Achlamydeous is defined as a flower that lacks both petals and sepals. In other words, the flower does not have any of the outermost protective structures that are commonly found in most flowers. This makes the flower appear to be naked or without clothing.


The word achlamydeous comes from the Greek words “a-” meaning without, and “chlamys” meaning cloak or mantle. The term was first used in the mid-1800s by botanists who were studying the structures of flowers.

Meaning in different dictionaries

In the Oxford English Dictionary, achlamydeous is defined as “having no floral envelopes or perianth.” Merriam-Webster defines it as “having no floral envelope.” The Cambridge Dictionary defines it as “having no petals or sepals.”


Achlamydeous flowers are often associated with plants that are wind-pollinated or self-pollinated. Since they lack the colorful petals and sepals that are commonly found in flowers, they do not attract pollinators in the same way that other flowers do.


Synonyms for achlamydeous include apetalous, ebracteate, and naked. These terms all refer to flowers that lack petals and sepals.


The antonyms of achlamydeous are chlamydeous and perianth-bearing. These terms refer to flowers that have petals and sepals.

The same root words

The root word “chlamys” is also found in other botanical terms, such as chlamydospore (a thick-walled spore) and chlamydate (having a chlamys or mantle-like structure).

Example Sentences

  • The achlamydeous flowers of the wind-pollinated grasses are not as showy as those of insect-pollinated plants.
  • The ebracteate flowers of this plant are achlamydeous and lack any visible floral envelopes.
  • The naked flowers of this species are achlamydeous and have no petals or sepals.
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