Happiness is the cowslip

 And I serve the fairy queen,
To dew her orbs upon the green.
The cowslips tall her pensioners be:
In their gold coats spots you see;
Those be rubies, fairy favours,
In those freckles live their savours:

-- William Shakespeare, A Midsummer Night's Dream, Act 2, Scene 1

The blushing poppy

Ypres, Belgium

Why does one climate and one soil endue

The blushing poppey with a crimson hue,

Yet leave the lily pale, and tinge the violet blue?

-- Matthew Prior (1664-1721)