Simultaneously, two serines in each Smad2/3 phosphorylated by RI receptor kinase bind to phosphoserine-binding sites in the MH2 domains of a Smad4

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I- Homogamous head

This type of inflorescence exhibits single kind of florets. 

disc florets alone or ray florets alone

II- Heterogamous head; 

The inflorescence possesses both types of florets.

Example;   Helianthus

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Cymose Inflorescence

It is a definite or determinate inflorescence

The stalked flowers are either basipetal or centrifugal

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Simple cyme (solitary)

Determinate inflorescence consist of a single flower, it may be terminal or axillary

Example: Hibiscus rosa-sinensis

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Monochasial cyme (uniparous)

A.helicoid (bostryx)

Ex: Hamelia, Drosera, Myosotis

Monochasial cyme (uniparous)

B. Scorpioid (cincinnus)

Ex: Heliotropium (cherry pie)

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Simple dichasium (biparous)

A central axis ends in a terminal flower, further growth is produced by two lateral buds. 

Ex: Bougainvillaea, Jasmine, Teak, Mirabilis.

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Compound dichasium

A terminal old flower develops lateral simple dichasial cymes on both sides.

Simple dichasium is called cymule

Ex: catchfly, or campion, Silene; 

Caryophyllaceae