daisy
It is a small white flower with a yellow centre of course.. The most common I can think of is a Daisy. There are a number of 'Daisies' but Bellis perennis (Binomial name) is what you would expect to see in places such as grassy areas.
Cowslip
The coloured part of the Poinsettia, red,pink or white. is a bract or modified leaf. The flower is the small yellow parts in the centre. The Latin name is Euphorbia pulcherrima.
The forget me not is a flower that is blue flower with a small yellow center. It is the common name of the flower and as it name states is given to remind us of something thing or someone.
lobelia
a Jasmine is a climbing shrub with delicate and fragrant white or yellow flowers. fro9m Persia
Sunflower
A yellow flower (:
If you mean the girl's name, it's named after a small White flower prevalent throughout England
A buttercup is one such flower. Dandelion is another.
The Indian flower is called a lotus. A pink Flower with a yellow dot inside.
Wrightia antidysenterica