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The term perianth is derived from Greek περί (peri, "around") and άνθος (anthos, "flower"), while perigonium is derived from περί (peri) and γόνος (gonos, "seed, sex organs"). In the mosses and liverworts ( Marchantiophyta ), the perianth is the sterile tubelike tissue that surrounds the female reproductive structure (or ...
1. In flowering plants, a ring of structures that may be united in a tube, arising from the corolla or perianth of a flower and standing between the perianth lobes and the stamen s. The trumpet of a daffodil is a corona. 2. In grasses, a hardened ring of tissue surmounting the lemma in some species. cortex. pl. cortexes or cortices
These are fused at the base to form one large, showy, six-parted structure (the perianth). In lilies the organs in the first whorl are separate from the second, but all look similar, thus all the showy parts are often called tepals. Where sepals and petals can in principle be distinguished, usage of the term "tepal" is not always consistent ...
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. [2]
In a mature flower, the perianth consists of a calyx and the corolla (petals) it supports. Petals are modified leaves that form an inner whorl surrounding the reproductive parts of flowers. They are often brightly coloured or unusually shaped to attract pollinators. All of the petals of a flower are collectively known as the corolla.
The perianth is undifferentiated and biseriate (two whorled), formed from six tepals arranged into two separate whorls of three parts each, although Scoliopus has only three petals, free from the other parts, but overlapping.
Irregularities in floral symmetry in these cases involve the perianth and androcecium. The perianth almost always has a distinct calyx and corolla. However, the corolla may be absent, in which case the perianth is said to be sepaline, as occurs in dozens of cesalpinioid genera. The calyx has 5 sepals (rarely 3 or 6) arranged in a single cycle ...
The meristem can be defined as the tissue or group of plant tissues that contain undifferentiated stem cells, which are capable of producing any type of cell tissue.Their maintenance and development, both in the vegetative meristem or the meristem of the inflorescence is controlled by genetic cell fate determination mechanisms.