Sessile flower (main axis elongated)

Spike

Examples: chaff flower (Achyranthes), bottle brush (Callistemon), Adhatoda vasica, Amaranthus

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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

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Polychasial cyme (multiparous)

multiple branches arise at the base of the apical flower on the peduncle. The oldest flower is placed in the middle of the axis

Ex: Calotropis, Hamelia patens