Charles Sturt University
Charles Sturt University

Interpreting the Gynoecium

Interpreting the gynoecium part of a floral formula

  • G1_: one ovary, one loculus, superior (1 free carpel)
  • G1¯: one ovary, one loculus, inferior (1 free carpel)
  • G3_: three free ovaries each with its own stigma and style, each ovary with a single loculus, superior (3 free carpels)
  • G(3)_: this represents a superior ovary with 3 fused carpels but various structural combinations could apply, e.g.:
    • one ovary, most commonly the ovary will have 3 loculi,
    • one ovary with a single loculus but with 3 placentas and/or 3 styles or 3 stigmas, or
    • 3 free ovaries but united by a single style.
  • G∞_: more than 10 free ovaries each with its own stigma and style, each ovary with a single loculus, superior (numerous free carpels)
  • G0: indicates a sterile flower or where the flower is functionally male only
  • G(-3-) or G-(3)-: this format can be used to indicate a semi- or half-inferior ovary