Number of floral parts per whorl is called merosity. Perianth merosity is the number of perianth parts per whorl.
1. Isomerous-Presence of same number of perianth parts in different whorls of a flower. (five sepals, five petals). Example: Hibiscus.
2. Anisomerous-Each whorl of flower contains different number of members. Example: Annona.
3. Bimerous-Floral parts in two or multiples of two. Example: Ixora
4. Trimerous-Floral parts in three or multiples of three. Example: Allium, Monocots.
5. Tetramerous-Floral parts in four or multiples of four. Example: Brassica juncea.
6. Pentamerous-Floral parts in five or multiples of five. Example: Hibiscus, Dicots.

Types of Stamens based on Length:
1. Didynamous (di-two, dynamis-strength): Four stamens in which two with long filaments and two with short filaments. Eg: Lamiaceae, Ocimum. If all four stamens are in two equal pairs then the condition is called didynamous.
2. Tetradynamous (tetra-four): Six stamens of which four with long filaments and two with short filaments. Eg: Brassicaceae (Brassica).
3. Heterostemonous: Stamens are of different lengths in the same flower. Eg: Cassia, Ipomoea

1. An inflorescence with the indeterminate central axis and pedicellate flowers arise from the common point of peduncle at the apex.
2. Compound umbel inflorescence is a branched umbel.
3. Each such umbel is called an umbellet.
4. Eg: Daucus carota (carrot).

Placentation: The mode of distribution of placenta inside the ovary is called placentation. (Placenta bears the ovules.) It is of different types as follows:
1. Marginal: It is with the placentae along the margin of a unicarpellate ovary. Eg: Fabaceae.

2. Axile: The placentae arises from the column in a compound ovary with septa. Eg: Hibiscus, tomato, lemon.

3. Superficial: Ovules arise from the surface of the septa. Eg: Nymphaeaceae.

4. Parietal: It is the placentae on the ovary walls or upon intruding partitions of a unilocular, compound ovary. Eg: Mustard, Argemone, cucumber.

5. Basal: It is the placenta at the base of the ovary. Eg: Sunflower, Marigold.

6. Free-central: It is with the placentae along the column . in a compound ovary without septa. Eg: Caryophyllaceae, Dianthus, Primrose.

The inflorescences do not show any of the development pattern types are classified under special type of inflorescence.
Cyathium:
Cyathium inflorescence consists of small unisexual flowers enclosed by .acommon involucre which mimics a single. flower. Male flowers are organised in a scorpioid manner. Female flower is solitary and centrally located on a long pedicel. Male flower is represented only by stamens and female flower is represented only by pistil. Cyathium may be actinomorphic (Example: Euphorbia) or zygomorphic (Example: Pedilanthus.) Nectar is present in involucre.

Hypanthodium:
 Receptacle is a hollow, globose structure consisting unisexual flowers present on the inner wall of the receptacle. Receptacle is closed except a small opening called ostiole which is covered by a series of bracts. Male flowers are present nearer to the ostiole, female and neutral flowers are found in a mixed manner from middle below. Example: Ficus sp. (Banyan and Pipal). Coenanthium:
Circular disc like fleshy open receptacle that bears pistillate flowers at the center and staminate flowers at the periphery. Example: Dorstenia

(i) Monothecal: One lobe with two microsporangia. They are kidney-shaped in a cross-section. eg. Malvaceae.
Some other types: Haplostemonous: stamens are uniseriate and equal in number to the petals and opposite the sepals (antisepalous).
Obhaplostemonous: Stamens are uniseriate, number equal to petals and opposite the petals (antipetalous)
Diplostemonous: Stamens are biseriate, outer antisepalous, inner antipetalous. eg. Murraya.
Obdiplostemonous: Stamens are biseriate, outer antipetalous, inner antisepalous. eg. Caryophyllaceae.
Polystemonous: Numerous stamens are normally many more than the number of petals.
(ii) Dithecal: It is a typical type, having two lobes with four microsporangia. They are butterfly shaped in cross section. eg. solanaceae.

(i) Basifixed (Innate): Base of anther is attached to the tip of a filament. eg. Brassica, Datura.
(ii) Dorsifixed: Apex of filament is attached to the dorsal side of the anther. eg. Citrus, Hibiscus.
(iii) Versatile: Filament is attached to the anther at the midpoint. eg. Grasses.
(iv) Adnate: Filament is continued from the base to the apex of the anther. eg. Verbena, Ranunculus, Nelumbo.
Anther dehiscence: It refers to opening of anther to disperse pollen grains.

(i) Longitudinal: Another dehisces along a suture parallel to long axis of each anther lobe. eg. Datura, chinarose, cotton.
(ii) Transverse: Anther dehisces at right angles to the long axis of anther lobe. eg. Malvaceae.
(iii) Poricidal: Anther dehisces through pores at one end of the thecae. eg. Ericaceae, Solanum, potato, brinjal, Cassia.
(iv) Valvular: Anther dehisces through a pore covered by a flap of tissue. eg. Lauraceae, Cinnamomum.
Anther dehiscing direction: It shows the position of anther opening relative to the anther of the flower.

(i) Introrse: Anther dehisces towards the centre of the flower. eg. Dianthus.
(ii) Extrorse: Anther dehisces towards periphery of the flower. eg. Argemone.

In cauliflorous type, inflorescence developed directly from a woody trunk. Example: Theobroma cocoa.

Fruit develops from multicarpellary, multilocular, syncarpous, superior ovary. The fruit wall is differentiated into leathery epicarp with oil glands, a middle fibrous mesocarp. The endocarp forms distinct chambers, containing juicy hairs. Example: Orange, Lemon.

Fruit develops from monocarpellary, superior ovary. It is usually one seeded. Pericarp is differentiated into outer skinny epicarp, fleshy and pulpy mesocarp and hard andstony endocarp around the seed. Example: Mango, Coconut.

Fruit develops from bicarpellaryor multicarpellary, syncarpous ovary. Here the epicarp is thin, the mesocarp and endocarp remain undifferentiated. They form a pulp in which the seeds are embedded. Example: Tomato, Date Palm, Grapes, Brinjal.

Fruit has a fruit wall. It is otherwise called pericarp. It is differentiated into outer epicarp, middle mesocarp and inner endecarp. The inner part of the fruit is occupied by the seed.

1. The branch that bears the flower is called mother axis.
2. The side of the flower facing the mother axis is called posterior side.