mysterious unknown weed/wildflower

tenacre(Z5 SW MI)August 20, 2014

Trying to identify a mysterious weed, and not having much luck over at the "weed" forum. Thought maybe the gurus in this forum might have a clue or two...

http://forums.gardenweb.com/forums/load/weeds/msg0810164325794.html?23951

Thanks!

Here is a link that might be useful: mystery weed/wildflower

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esh_ga

Compare to Conyza canadensis.

    Bookmark   August 20, 2014 at 5:37PM
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tenacre(Z5 SW MI)

OK thanks for putting me on the right track.

I think it may be Conyza sumatrensis instead of Conyza canadensis, because it is over 2 meters tall. What part of the plant should I photograph and post to help tell the difference?

    Bookmark   August 20, 2014 at 7:24PM
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lycopus(z5 NY)

Conyza canadensis can reach 2 m in height and exceptionally large specimens can reach 3.5 m. From what I can father from the Flora of North America it appears that Conyza sumatrensis doesn't occur in North America. Conyza floribunda and C. bonariensis do but don't occur as far north as Michigan, the former only in CA and FL and the latter mostly near the coast from VA south.

    Bookmark   August 20, 2014 at 8:43PM
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tenacre(Z5 SW MI)

"Conyza canadensis can reach 2 m in height and exceptionally large specimens can reach 3.5 m. From what I can father from the Flora of North America it appears that Conyza sumatrensis doesn't occur in North America."

OK thanks.

Can someone show me where the "bracts" are in this picture? The link below has higher resolution photos.

Here is a link that might be useful: photos

    Bookmark   August 21, 2014 at 10:20AM
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missingtheobvious(Blue Ridge 7a)

The bracts are the scaly layers around the base of the flower.

    Bookmark   August 21, 2014 at 11:04AM
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tenacre(Z5 SW MI)

"The bracts are the scaly layers around the base of the flower."

OK thanks. That's what I thought, but wasn't sure.

In the pictures I posted, they look quite hairy. The info I've found so far on the web says C. canadensis bracts are glabrous.

I'm going to start a separate thread for anyone who would like to discuss this further.

    Bookmark   August 21, 2014 at 11:18AM
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