Cyme

In Botanical, a cyme is a Inflorescence simple definite (or sympodic), in which the main axis is finished by a Fleur; this flower, which is the central flower of the inflorescence flowers in first and stops the growth of the axis, from where the qualifier of definite. It is the same of the secondary axes, all finished by a flower. Contrary to the case of the indefinite inflorescences, flowering is Centrifuge.

According to their mode of ramification, one distinguishes three types of cymes:

Cyme bipare

The main axis carries two secondary axes which fit below the final flower. The secondary axes can also ramify on the same model, often in a plan perpendicular to the initial ramification: it is a type of inflorescence met at the Caryophyllacée S, like the eyelet, the Stellaire, the Lychnis, etc but also in others families: the Begonia S, some flaxes…

Cyme multipare

The main axis carries at least three secondary axes which fit below the final flower into the armpit of Bractée S; themselves are ramified on the same model. Example: the Euphorbium clock alarm.

Uniparous Cyme

In the case of a uniparous cyme, the main axis produces only one secondary ramification, which itself carries only one ramification, and so on. According to the orientation of the ramifications, one obtains two uniparous types of cymes:

Cyme scorpioïde

The inflorescence is curved in the shape of tail of scorpion, owing to the fact that the successive ramifications occur all on the same side of the axis, all the bractées floral ones finding itself inside the curve and the flowers outside. The cyme scorpioïde is found at many Borraginacée S, like the Myosotis.

Helicoid Cyme

The ramifications occur alternatively side and other of the axis, giving to the inflorescence a helicoid form; however often the axes are rectified and are in the prolongation of the initial axis, the unit simulating a Grappe. The difference with the latter is detected with the fact that the flowers are contrary to one bractée (which is actually that of the higher flower (whereas in a bunch, the flowers are always with the armpit of one bractée). One finds this phenomenon of drive of bractées at the Solanacées.

Inflorescences made up: the regrouping of cymes in bunch is called a thyrse.

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