Plant and Tree Identification: Which Thistle

Forum: Plant and Tree Identification Replies: 12, Views: 90 Print -

Author Content zhinu (Laura) Olympia, WA (Zone 8a) August 19, 2008 2:57 AM Post #5434718 Which thistle is this? Click the image for an enlarged view. Resin Northumberland (United Kingdom) (Zone 9a) August 19, 2008 4:51 AM Post #5434794 If it was over here, I'd say Welted Thistle Carduus crispus. Not sure if (a) this is widely naturalised or not in WA, or (b) if you have any other similar native thistles. Resin Metrosideros Keaau, HI August 19, 2008 3:16 PM Post #5437207 The plant matches up with Carduus crispus very well. It is naturalized across the U.S. and Canada. zhinu (Laura) Olympia, WA (Zone 8a) August 20, 2008 3:35 AM Post #5440274 No pictures in PF, are you sure enough that I should post the pictures I have there? Resin Northumberland (United Kingdom) (Zone 9a) August 20, 2008 5:24 AM Post #5440347 Yep, I'd go ahead. Resin ecrane3 Dublin, CA (Zone 9a) August 20, 2008 10:16 AM Post #5441158 The USDA database doesn't list it as occurring in WA--doesn't mean it's impossible since it does occur next door in British Columbia so I suspect there are probably a few around, but the fact that they don't list it there makes me suspect it's not very widespread. I don't know if it's worth taking a look at the other Carduus species that are more common in WA--here's the list [HYPERLINK@plants.usda.gov] Nedhudson1 Thorne Bay, AK (Zone 6b) August 20, 2008 11:55 AM Post #5441665 Before you do that,take a close look at Cirsium Arvense-Canada thistle.It's native & prevalent in WA. Also check out Cirsium undulatum & compare it to yours. This message was edited Aug 20, 2008 8:00 AM KSBaptisia Beatrice, NE (Zone 5b) August 20, 2008 12:32 PM Post #5441840 Canada thistle, in spite of the common name, is not native to North America. It certainly is prevalent in many places, including Washington, though! I can't see the leaves clearly enough to say what species of thistle it is, but you might also take a look at Cirsium vulgare. zhinu (Laura) Olympia, WA (Zone 8a) August 20, 2008 1:08 PM Post #5441982 Ned – it’s not Cirsium Arvense. Mine is far pinker and the “petals” go up rather than out like hair. Could be Cirsium undulatum, but its foliage seems to dark. Here is the whole plant. Click the image for an enlarged view. zhinu (Laura) Olympia, WA (Zone 8a) August 20, 2008 1:09 PM Post #5441988 Here is a close-up of the flower. Click the image for an enlarged view. Resin Northumberland (United Kingdom) (Zone 9a) August 20, 2008 4:03 PM Post #5442781 Correct name for Cirsium arvense is Creeping Thistle: [HYPERLINK@ip30.eti.uva.nl] . It's also a very different plant to the mystery thistle. Resin zhinu (Laura) Olympia, WA (Zone 8a) August 20, 2008 4:22 PM Post #5442898 Resin - That still has the hair like rather then spiky "petals" KSBaptisia Beatrice, NE (Zone 5b) August 20, 2008 4:31 PM Post #5442940 Well, looking at the leaves, it is certainly not Cirsium undulatum or Cirsium vulgare.

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