Botany Dictionary

  • Once palmately compound

    Once palmately compound

    Referring to a leaf arrangement where the leaflets are attached to a single point at the end of the petiole,…

  • Once pinnately compound

    Once pinnately compound

    Referring to a leaf arrangement where leaflets are arranged on either side of a central rachis, with a single terminal…

  • Once pinnately lobed

    Once pinnately lobed

    Describing a leaf that has a single set of lobes along one side of the midrib, typically with a single…

  • Once pinnate-pinnatifid

    Once pinnate-pinnatifid

    Describing a leaf structure where the leaflets are arranged pinnately, and the leaflets themselves are pinnatifid (lobed).

  • Ontogeny

    Ontogeny

    The development and growth of an organism from fertilization to maturity.

  • Oogamous

    Oogamous

    Describing a type of sexual reproduction where the larger, non-motile egg cell is fertilized by a smaller, motile sperm cell.

  • Open-pollinated

    Open-pollinated

    Referring to plants that are pollinated by natural mechanisms such as wind or insects, rather than through controlled breeding.

  • Opera utique oppressa (plural), and opus utique oppressum (singular)

    Opera utique oppressa (plural), and opus utique oppressum (singular)

    Latin terms used in botanical contexts, referring to works or tasks that are thoroughly completed or oppressive in nature.

  • Operculum (calyptra)

    Operculum (calyptra)

    A cap-like structure that covers and protects the spore-producing organ in certain mosses or ferns.

  • Obovoid

    Obovoid

    Describing a three-dimensional shape that is oval or egg-shaped, with the larger end at the top.