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Whitetop or Cardaria (Lepidium) draba!
In message , Sacha
writes On 2012-07-02 18:43:13 +0100, David Hill said: On 02/07/2012 17:58, Sacha wrote: On 2012-07-02 17:49:46 +0100, Stewart Robert Hinsley said: In message , Jake writes On Mon, 02 Jul 2012 14:39:27 +0100, Spider wrote: This is, I believe, the identity of the weed which perniciously invades part of my garden. http://en.wikipedia.org/wiki/Whitetop http://www.unce.unr.edu/programs/sites/tallwhitetop/ http://jennwarren.hubpages.com/hub/C...oxious-Weeds-I n-Your-Lawn-and-Garden Sorry for all the links, but this weed has been the bane of my for 30 years. I *may* be just starting to see its grip loosening. I've even risked planting that part of my garden again (except for one corner). Previously, I've never dared move a wanted plant from that area of the garden to another for fear of spreading it. I dream of the day I never see another leafy spring rosette. Pedipalps crossed. Oh dear. TBH, I've never heard of this weed being found in the UK before. I must lead a very sheltered life. There's a largish colony by a canal bank a couple of miles away from me, but it's scarce of much of the country. It tends to be southeastern and coastal. Cheers, Jake ======================================= Urgling from the East End of Swansea Bay. We don't yet have a "dah dah dah dah dee dee deeee" theme tune but we're working on it. There are a couple of recorded sites at the east end of Swansea Bay, but there could be less than 50 sites in the whole of Wales. It would appear that Spider has a rarity and should now go into high reverse with eradicating it!! I've never seen it before and thought it looked quite attractive... Not such a rarity Sacha, see the map in this link http://www.brc.ac.uk/plantatlas/inde...ecies-name-329 David @ the very wet end of Swansea bay, where it's been raining almost all day. Is this a relative of the weed we have far too much of down this way? It's the one people here call "shepherd's purse" with the seeds that 'ping' off in all directions the second you touch a pod. It has little white flowers and seems to bloom at all stages of growth. Afaik, it's bitter cress but I could have them muddled up. They're all crucifers. Which crucifers are more closely related to which other crucifers is not an easy question. The closest relatives of the pepperworts (Lepidium) are the swine cresses (Coronopus) - the latest botanical opinion sinks Coronopus in Lepidium. Cardamine hirsuta (hairy bitter cress) is a likely identification for the weed that has seeds that ping off when you touch a pod. But I would be surprised to see it called shepherd's purse - it has long narrow seed pods, unlike the obcordate seed pods of Capsella bursa-pastoris (shepherd's purse) which do have an appearance that one could describe as purse-like. -- Stewart Robert Hinsley |