Inflorescence and its Types

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INFLORESCENCE:

Inflorescence: the group or arrangement in which flowers are borne on a plant.


Spike

An elongate, unbranched, indeterminate inflorescence with sessile flowers.

Spikelet

A small spike, characteristic of grasses and sedges.

Raceme

An elongate, unbranched, indeterminate inflorescence with pedicelled flowers.

Panicle

A branched raceme.

Corymb

A flat-topped raceme with elongate pedicels reaching the same level.

Compound Corymb

A branched Corymb.

Umbel

a flat-topped or rounded inflorescence with the pedicels originating from a common point. Umbels can be determinate or indeterminate.

Compound Umbel

a branched umbel, with primary rays arising from a common point, and secondary umbels arising from the tip of the primary rays.

Capitulum
(or head)

a dense vertically compressed inflorescence with sessile flowers on a receptacle and subtended by an involucre of phyllaries, characteristic of the Asteraceae. Heads can be determinate or indeterminate.

Thyrse

a many-flowered inflorescence with an indeterminate central axis and many opposite, lateral dichasia; a mixed inflorescence, with determinate and indeterminate shoots.


Simple Cyme or Dichasium

A determinate inflorescence with 2 dichotomous lateral branches and pedicles of equal length.

Compound Dichasium

a branched dichasium

Compound Cyme

a determinate thyrse.

Helicoid Cyme
(or bostryx)

a determinate cyme in which the branches develop only on 1 side, due to the abortion of opposing paired bud, the inflorescence thus appearing simple.

Cincinnus

a tight, modified helicoid cyme in which the pedicels are very short.

Scorpioid Cyme
(or rhipidium)

a zig-zag determinate cyme with branches developing alternately on opposite sides of the rachis, due to abortion of opposing paired bud.

 

Capitulum (= head):

a dense cluster of sessile flowers. adj. Capitate.

Catkin:

a spike in which the flowers are unisexual and without conspicuous perianth.

Corymb:

a Racemose inflorescence in which the pedicels of the lower flowers are longer than those of the flowers above, bringing all flowers to about the same level.

Cyme:

an inflorescence in which each flower, in turn, is formed at the tip of a growing axis and further flowers are formed on branches arising below it. adj. cymose. cf. raceme.

Glomerule:

a small compact cluster. adj. glomerulate.

Raceme:

an indeterminate inflorescence in which the main axis produces a series of flowers on lateral stalks, the oldest at the base and the youngest at the top. adj. Racemose. cf. cyme.

Spadix:

a spicate inflorescence with a stout, often succulent axis.

Spike:

an unbranched, indeterminate inflorescence in which the flowers are without stalks. adj. spicate.

Syconium:

a multiple fruit with a hollow center, e.g. in figs (Ficus).

Thyrse:

a branched inflorescence in which the main axis is indeterminate and the lateral branches determinate in their growth.

Umbel:

a Racemose inflorescence in which all the individual flower stalks arise in a cluster at the top of the peduncle and are of about equal length.

Verticillaster:

a false whorl of opposed cymes.




Simple, Compound, Special

Racemose:

Stem continue to grow and new flower arise toward the tip

Simple Raceme:

Pedicles of equal length

Corymb:

All flower at the same level

Spike:

Flowers sessile

Catkin:

Spike with unisexual flower

Capitulum:

The inflorescence of floret appear to be a single flower

Hypenthodium:

Male and female flower in the chamber

Cymose:

A flower arises at the tip and new flowers arise below it.

Uniparous:

The main axis ends in a flower below which a daughter axis is produced which again ends in flower.

Biparous:

Two branches arise

Multiparous:

More than two branches

Cymose Head:

Sessile scorpioid cyme

Scorpoil:

Branches arise on alternate side.

Special:

Cyathium:

The main axis ends in a female flower, born on a long stalk. The flower is at base surrounded by involucre. Inside involucre male flower is present.

Verticillaster:

At single node two clusters of flowers.

Umbellate cymose head:

The flower is in clusters of helicoid cymose.


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Naeem Javid Muhammad Hassani

NJMH is working as Deputy Conservator of Forests in Balochistan Forest & Wildlife Department (BFWD). He is the CEO of Tech Urdu (techurdu.net) Forestrypedia (forestrypedia.com), Majestic Pakistan (majesticpakistan.pk), All Pak Notifications (allpaknotifications.com), Essayspedia, etc & their YouTube Channels). He is an Environmentalist, Blogger, YouTuber, Developer & Vlogger.

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