Ii) Capitulum (Head): The peduncle is reduced to a flat, concave, or convex disc, the receptacle that bears small sessile and centripetally arranged flowers called florets, surrounded by an involucre of bracts.Д®xamples вЂ“ cosmos, tagetes, zinnia, chrysanthemum, and sunflower Here, the main axis above the first flower is so shortened that the internodes between the successive flowers become suppressed.Д®xamples вЂ“ Water hyssop, water pennywort, and Centella I) Simple Umbel: More or less equally heightened pedicellate flowers arranged centripetally around a significantly reduced peduncle with an involucre or a whorl of bracts below. These two types of flowers are separated by downwardly directed sterile hair or neuter flower.Д®xamples вЂ“ Colocasia, arum, maize, banana, and palm In contrast, its lower part holds sessile uniВsexual flowers, lower female and upper male. Here, the peduncle bears a colored and sterile appendix at the upper part. Vii) Spadix: It is a specialized spike possessing a thick fleshy peduncle and a large green or colored bract called the spathe. Here, the peduncle is thin, long, and weak.Д®xamples вЂ“ mulberry, willow, poplar, red hot Cattail, Betula, Quercus, birch, and oak Vi) Catkin: It is a compact pendulous spike with a hanging axis bearing sessile unisexual flowers that matures and falls as a single unit. It remains surrounded at the base by two scaled bracts called glumes.

V) Spikelet: It is a compact dry spike with only one or a few sessile flowers born on a specialized axis called the rachilla. Iv) Spike: Sessile flowers borne acropetally over an elongated peduncleД®xamples вЂ“ Malabar nut, chaff-flower, bottle brush, Amaranthus, and Verbena. Iii) Corymbose Raceme: In this case, the young flowers are arranged like a corymb, but in the mature stage, the longer pedicels of the lower flowers do not bring them to the level of upper ones. Here, the pedicels of older flowers are longer than those of younger ones so that all flowers lie at the same level.Д®xamples вЂ“ candytuft, Lantana, and cherry Ii) Corymb: Like a typical simple raceme, unbranched peduncle bears pedicellate flowers in an acropetal way. I) Simple Raceme: Unbranched, elongated peduncle bearing pedicellate or stalked flowers acropetallyД®xamples вЂ“ mustard, radish, Delphinium, Larkspur, Veronica, and Linaria Racemose inflorescence can be divided into two types, simple and compound, depending on the development of the main axis and pedicels of the flowers. In the latter, the youngest ones are towards the center, and the oldest flowers are towards the periphery. In the former, the youngest flowers are towards the apex, and the oldest flowers are towards the base of the inflorescence. Here, the flowers are arranged in one of two ways вЂ“ acropetal or centripetal. It is an indefinite or indeterminate type of inflorescence, showing indefinite growth of the main axis and bears numerous flowers due to the presence of an active growing point.

The simple inflorescence is of two types: racemose inflorescence and cymose inflorescence.

Based on the mode of branching of the main axis or peduncle, the main groups of inflorescences are: 1) simple (single), 2) compound, 3) mixed, and 4) special.

Helicoid cyme inflorescence example