Easily confused with : Hairy Bittercress, but that has non-hairy stems, whereas Wavy Bitter-cress has hairy stems! Also, the seed-pods of Hairy Bitter-cress usually over-top the flowers, whereas in Wavy Bitter-cress the pods are usually lower than the top-most flower. Wavy Bitter-cress has nominally six stamens whereas Hairy Bitter-cress has but four. The number of stem leaves also differs: Wavy Bitter-cress has between four and ten whereas Hairy Bitter-cress has only one to four stem leaves. Although the leaves of Wavy Bitter-cress are hairless, those of Hairy Bitter-cress only might possibly be hairy.
No relation to :
Wavy St John's Wort nor to Wavyleaf Sea-Lavender [plants with similar names].
Hybridizes with :
but luckily both of these are present in but very few locations, and are not present where the above photographs were taken.
- Hairy Bitter-cress (Cardamine hirsuta) to produce
Cardamine × zahlbruckneriana (Cardamine flexuosa × hirsuta)
- Cuckooflower (Cardamine pratensis) to produce
Cardamine × fringsii (Cardamine pratensis × flexuosa)
Wavy Bitter-cress is very weedy. if you have it in your garden, you will like as not never get rid of it for good. It favours damp and disturbed ground in the shade. Not averse to mud, marshes or stream-sides and mountains. Almost, but not quite, ubiquitous throughout the UK.