Merosity

Merosity: Merosity is the number of component parts in each whorl of a plant structure. It is most commonly used in the context of flowers, in which case it refers to the number of sepals in the calyx, the number of petals in the corolla, and the number of stamens in each whorl of the androecium. The term may also be used to refer to the number of leaves in leaf whorls.

Types of merosity include:

2: dimery, dimerous, 2-merous

3: trimery, trimerous, 3-merous

4: tetramery, tetramerous, 4-merous

5: pentamery, pentamerous, 5-merous

Tulipa clusiana: trimerous

Correa alba: tetramerous

Crassula ovata: pentamerous

Further reading

Decraene, L. P. Ronse; Smets, E. F. (1994). "Merosity in flowers: Definition, origin, and taxonomic significance". Plant Systematics and Evolution 191 (1–2): 83–104. doi:10.1007/BF00985344.

Categories:
Plant morphology

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Merous — Merosity is used to designate that a flower has whorls of floral parts in the perianth. It describes how many segments the whorl of petals or sepals or tepals have in a flower. Thus if a flower has five petals that look the same, then the flower… … Wikipedia
Sepal — A sepal (from Latin separatus separate + petalum petal ) is a part of the flower of angiosperms or flower plants. Sepals in a typical flower are green and lie under the more conspicuous petals. As a collective unit the sepals are called the of a… … Wikipedia
Dimer — may refer to: Dimer (chemistry), a chemical structure formed from two sub units Dimer model, an item in statistical mechanics Protein dimer, a protein quaternary structure Julius Dimer (1871–1945), a German chess master Dimerous refer to plants… … Wikipedia
Polymèrie — La polymèrie, appelée aussi la X mèrie, désigne le nombre de divisions symétriques (de symétrie en général axiale) des verticilles (périanthe, feuilles, branches) d une plante. Elle est surtout utilisée pour caractériser les sépales du calice,… … Wikipédia en Français

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