jonmortin's picture

Bittercress

Observed: 21st December 2012 By: jonmortin
Bristol Regional Environmental Records Centre
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Description:

Hairy or Wavy-how do you distinguish?

Identifications
Species interactions

No interactions present.

Species with which Wavy Bitter-cress (Cardamine flexuosa) interacts

Comments

GrizzledBadger's picture

Hairy Bittercress, an annual

Hairy Bittercress, an annual upto 30cms, leaves hairy above, flowers Feb/Nov & during in mild winters; with 4 stamens, pods extending beyond flowers.
Wavy Bittercress, biennial, taller upto 50cms, pods barely extending beyond flowers which appear April/Sept & have 6 stamens. (Fitter et al)

Brock

Rachy Ramone's picture

Jon, it's not easy...

..unless you can catch it absolutely in flower at that moment, with all stamens present, and don't forget that 2 of the 6 (Wavy)are shorter than the rest.

(According to Rose, both flower 3-9, btw)

To make it worse, the stems of Hairy are often not straight (ie wavy) and the stems and leaves of Wavy are often hairy.

Wavy prefers damper places, Hairy will grow in drier environs, ie rocks, up walls etc.

If you have an upright stem, then you can count the stem leaves: Wavy has 4-7 stem leaves, Hairy has 0-4. But this depends on you finding a fully grown specimen.

If it's just the basal rosette, as you have here, it is very difficult to ID to species.

Rachy Ramone

How to take close-ups with cheap phone and hand-lens:
http://tree-and-shrub-id.blogspot.co.uk/p/how-to-close-ups.html
Field Guides for Budding Botanists:
http://www.amazon.co.uk/-/e/B01A8YB0WY

RMWalls's picture

bitter cress

Agree, it is not easy without flowers.

I am guessing this is C.flexile from its jiz and the habitat clues. C.hirsuta is usually on disturbed ground (garden weed) and in exposed situations.

R M Walls