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Term Definition
Diadelphous stamens Stamens united into two, often unequal, sets; e.g., those of many Fabaceae, which have nine stamens in one set and one stamen in the other. Androecium of a papilionoid legume. Drawing by B. Angell.
Didynamous stamens With two pairs of stamens of unequal length. Didynamous stamens and staminode of a Bignoniaceae. Photo by S. A. Mori.
Heteromorphic stamens Stamens of two distinct types; one type usually bears fertile pollen and the other type bears sterile or fodder pollen; e.g., (Lecythidaceae) and species of (Fabaceae). Heteromorphic (= heterantherous) stamens of a species of Swartzia. Photo by S. A. Mori.
Stamens The male part of the flower comprised of the filament and the anther. Heteromorphic (= heterantherous) stamens of a species of Swartzia. Photo by S. A. Mori.
Urticaceous stamens Stamens that spring forward to release pollen at anthesis; typical of the flowers of the Urticaceae and some related families. Heteromorphic (= heterantherous) stamens of a species of Swartzia. Photo by S. A. Mori.
Vestigial stamens external Referring to an inwardly curved hood that possesses vestigial stamens only on the outside of the coil; e.g., in the Lecythidaceae. Heteromorphic (= heterantherous) stamens of a species of Swartzia. Photo by S. A. Mori.