Botany · Ch 4 — Reproductive Morphology
Perianth / androecial position on thalamus
Perianth / androecial position on thalamus
This describes precisely where the perianth (calyx, corolla) and androecium attach, relative both to the ovary and to a hypanthium if one is present. Hypogynous describes sepals, petals and stamens attached at the base of a superior ovary (Malvaceae). Epihypogynous describes them attached at the middle of a half-inferior ovary (Fabaceae, Rosaceae). Epigynous describes them attached at the tip of an inferior ovary (cucumber, apple, Asteraceae). Perigynous describes a hypanthium attached at the base of a supe …
What this figure shows. Three side-by-side floral diagrams comparing ovary position with and without a hypanthium, each with 'Hypanthium present' or 'Hypanthium absent' labelled: an inferior ovary sunk below the other whorls (hypanthium absent, epigynous); a half-inferior ovary with the other whorls attached near its middle (hypanthium absent, epihypogynous); and a superior ovary sitting above the other whorls, shown once with a hypanthium present (perigynous) and once without (hypogynous), with the fleshy cup-like Hypanthium …