white-flowered crucifers

The most widespread crucifer in the area is hairy bitter-cress (Cardamine hirsuta), which grows in a variety of weedy situations, but is absent from the dry situations favoured by some other cruciferous weeds. Cardamine hirsuta varies greatly in size, and habit.

Wavy bitter-cress (Cardamine flexuosa) is not easily distinguishable from C. hirsuta, but can be recognised by the presence of 6, rather than 4, stamens. I hadn't identified the former within the Florula Prima area until today, when I encountered some in wet area along the course of the abandoned railway line that runs along the back of my garden.

A third species of Cardamine, Lady's Smock (Cardamine pratense agg.) is widespread in wet areas, including my garden. (Cardamine pratense), which commonly propagates vegetatively, is a complex of at least 5 cytotypes, but although the species is variable, distinct types cannot be identifed by morphology in Britain.)

Shepherd's purse (Capsella bursa-pastoris) is common in dry urban locations, such as pavement back edges, and at the feet of street trees. A long-fruited crucifer, which I identify as thale cress (Arabidopsis thaliana) is also common in such locations.

Garlic mustard (Alliaria petiolata) is common along hedgerows and woodland edges.

Danish scurvy grass (Cochlearia danica) is common in its narrow habit - dry, hot, salty locations along the verges of major roads.

An observation of a single plant of whitlow-grass (Erophila verna) awaits confirmation.

Among crucifers with other coloured flowers, annual honesty (Lunaria annua), and species of Brassica and Sisyrimbium have been seen.