A prickly, tall plant, the Small teasel is closely related to the Common teasel, but has much smaller, more rounded flower heads. It prefers damp, open woodlands.

Selfheal is a low-growing, creeping plant that likes the short turf of grasslands, roadside verges or even lawns. Its clusters of violet flowers appear in summer.

Water-plantain is an aquatic plant of shallow water and muddy banks. In bloom over summer, it displays tall branches of loosely clustered, pale lilac flowers.

As its name suggests, Red bartsia does have a red tinge to its stem, leaves and small flowers. Look for it on roadside verges, railway cuttings and waste ground in summer.

The Early purple orchid is one of the first orchids to pop up in spring. Look for its pinkish-purple flowers from April, when bluebells still carpet our woodland floors. Its leaves are dark green…

A small and delicate plant of chalk grasslands, Fairy flax can be seen in bloom from May to September - look out for its nodding, white flowers.

Greater celandine is a very common plant that spreads easily in the garden, on waste ground and in hedgerows. It is considered a weed, but the small, yellow flowers provide nectar for insects.

Hedge mustard is a tall plant with small, yellow flowers atop tough stems. It likes disturbed ground and grows in hedgerows and roadside verges, and on waste ground.

Considered to be one of the prettiest gentians, the Chiltern gentian is a rare plant in the UK. It likes chalk grasslands, its purple, trumpet-shaped flowers blooming from August.

Creeping jenny is a low-growing plant of wet grasslands, riverbanks, ponds and wet woods. It has cup-like, yellow flowers and is a popular choice for garden ponds.

The early gentian is a rare plant that is only found in the UK. It likes sunny, lowland chalk grasslands, its purple, trumpet-shaped flowers blooming in May and June.

So-named for its spear-like leaves, Lesser spearwort can be found along the edges of ponds, lakes and streams, and in marshes and wet meadows. As a buttercup, it displays familiar, butter-yellow…