The colour of flowers is an important, often easily appreciated character, but it may be also quite variable and sometimes of difficult interpretation. Here we show some examples of the main colours adopted in this information system:
Flowers yellow to orange:

This character includes both flowers which are pale yellow...:

...flowers which are of a bright yellow colour...:

...and orange-coloured flowers.

We also include here some species with a multicoloured corolla, when the yellow colour is prevalent:



A particular case is that of the family Asteraceae, whose species have many flowers crowded in inflorescences called heads (see later). No problem when all flowers are of the same colour (e.g. yellow or orange)...


... but often the central flowers are yellow, and the marginal flowers (also called 'ray flowers') are white, in which case the colour which we attribute to the 'flower' (in this case to the head), is 'white'.

In this case the ray flowers are pink or violet, and the colour is 'pink to violet':

Flowers white: this character is usually easy to appreciate. However, there are often flowers which are of a very pale yellow or pink colour, that can be easily mistaken for 'white'. In such cases the species is usually 'doubled' and appears selecting both options. Here are some examples of white flowers:








A particular case is that of the family Asteraceae, whose species have many flowers crowded in inflorescences called heads (see later). When the central flowers are yellow, and the marginal flowers (also called 'ray flowers') are white, the colour which we attribute to the 'flower' (in this case to the head), is 'white'.
Flowers green to brownish:






Flowers red to violet: in this cases the colour ranges from bright red, to pink or violet-pink:
















A particular case is that of the family Asteraceae, whose species have many flowers crowded in inflorescences called heads (see later). When the central flowers are yellow, and the marginal flowers (also called 'ray flowers') are pink or violet, the colour which we attribute to the 'flower' (in this case to the head), is 'red to violet'.


Flowers pale to deep blue: