Cardamine hirsuta

Kathleen Sayce
Thu, 04 Apr 2013 15:25:31 PDT
What do you mean by species ? Do you
mean (i) different species of Cardamine or (ii) different generations ? If
(i), it can't be the case because we only have C. hirsuta here. If (ii), I
know :-( But we do not have much issues with controlling it before it
recreates its seeds stock during summer.

I mean different species. I was startled to find that there are several species lurking under the name C. hirsuta in the US, which explained why I had problems keying them out initially. All can go through several generations per year with the right growing conditions. Along the coast of the Pacific Northwest, for example, 4-5 generations per year are typical.  

I have not yet heard back from the researcher who sent me the original paper, so will simply list these annual species here, for anyone who wants to track them down. Note that the first one is native to the Pacific Northwest. All have appeared in some parts of the US, and in some areas, gardens have all species present. 

Cardamine oligosperma
Cardamine hirsuta
Cardamine flexuosa
Cardamine corymbosa
Cardamine scutata


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