Wood Anemone (Anemone nemorosa), also known as Windflower, in a wood near Tiptree in the latter half of April.

"Star-like they sprinkle
 The wildwood with light;
 Countless they twinkle
 The Windflowers white!"

Cicely Mary Barker - Flower Fairies of the Spring

Bluebells (Hyacinthoides non-scriptus) in Shut Heath Wood, Great Braxted in mid April.

Lesser Celandine (Ranunculus ficaria) and some Bugle (Ajuga reptans) on the edge of a path in a wood near Tiptree in mid April. Lesser Celandine is a member of the Buttercup family.

"Before the hawthorn leaves unfold,
 Or buttercups put forth their gold,
 By every sunny footpath shine
 The stars of Lesser Celandine."
Cicely Mary Barker - Flower Fairies of the Spring

Bugle (Ajuga reptans) in a wood near Tiptree.