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A mature flower. In this example, the perianth is separated into a calyx (sepals) and corolla (petals) The perianth (perigonium, perigon or perigone in monocots) is the non-reproductive part of the flower, and structure that forms an envelope surrounding the sexual organs, consisting of the calyx (sepals) and the corolla (petals) or tepals when called a perigone.
The perianth is reduced to two scales, called lodicules, [1]: 11 that expand and contract to spread the lemma and palea; these are generally interpreted to be modified sepals. The flowers are usually hermaphroditic — maize being an important exception — and mainly anemophilous or wind-pollinated, although insects occasionally play a role.
An alternative spelling of caespitose, meaning tufted or turf-like, e.g. the growth form of some grasses. chamber A cavity of an ovary. channelled Sunken below the surface, resulting in a rounded channel. chartaceous Having a papery texture. chasmogamous Of flowers that are pollinated when the perianth is open. Compare cleistogamous. chasmophyte
Perianth: made up of 5 tepals, polyphyllous, imbricate or quincuncial, green, ovate to oblong, persistent. Androecium: made up of 10 stamens, out of which 5 are fertile and 5 are scale-like, fimbriated, sterile staminodes, both alternating with each other, fertile stamens are antiphyllous, monadelphous, filaments slightly fused at the base ...
The perianth is either homochlamydeous (all tepals equal, e.g. Fritillaria) or dichlamydeous (two separate and different whorls, e.g. Calochortus) and may be united into a tube. Nectar is produced in perigonal nectaries at the base of the tepals.
First, at the base, are those non-reproductive structures involved in protecting the flower when it is still a bud, the sepals, then are those parts that play a role in attracting pollinators and are typically coloured, the petals, which together with the sepals make up the perianth (perigon, perigonium).
Perianth parts are also shown as arcs. They may be colored according to their type. In Blüthendiagramme the tepals are usually white with black stroke, sepals are hatched and petals are black. Ronse De Craene implies that it may be sometimes impossible to classify the organs, he shows green perianth parts as black and pigmented as white.
In botany, floral morphology is the study of the diversity of forms and structures presented by the flower, which, by definition, is a branch of limited growth that bears the modified leaves responsible for reproduction and protection of the gametes, called floral pieces.