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Stamens initiate as primordia from the flower apical meristem, but at maturity are attached to the receptacle, corolla (having an epipetalous stamen fusion; see below), hypanthium rim, or staminal disk, a fleshy, elevated, often nectariferous cushion of tissue.
This article aims to discuss the shortcomings of the past and current approach of staminodes and proposes definitions of staminode types for use as characters in phylogenetic analyses. Staminodial structures should be classified according to their position and function in the flower.
Different definitions can be applied for staminodes. For Watson and Dallwitz (1992-), a staminode is a sterile stamen, or a modified structure identifiable as such, borne in the androecial region of the flower. It may be merely imperfect, vestigial, or specialized (e.g., petaloid or nectariferous).
stamen, the male reproductive part of a flower. In all but a few extant angiosperms, the stamen consists of a long slender stalk, the filament, with a two-lobed anther at the tip. The anther consists of four saclike structures (microsporangia) that produce pollen for pollination.
The staminode is a novel floral organ in Aquilegia, and many questions remain about its development and function. In most species, Aquilegia staminodes develop individually before undergoing post-genital fusion at their margins to form a sheath-like structure around the carpels.
24 kwi 2020 · The staminodes of Aquilegia appear to be made up of a set of five or six sterile stamens fused together to form a sheath, with two whorls of five staminodes each surrounding the flower’s carpel.
