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mysterious unknown weed/wildflower

Posted by tenacre Z5 SW MI (My Page) on
Wed, Aug 20, 14 at 16:47

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


Follow-Up Postings:

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RE: mysterious unknown weed/wildflower

Compare to Conyza canadensis.


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RE: mysterious unknown weed/wildflower

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?


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RE: mysterious unknown weed/wildflower

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.


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RE: mysterious unknown weed/wildflower

"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


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RE: mysterious unknown weed/wildflower

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


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RE: mysterious unknown weed/wildflower

"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.


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