Plant ID forum: Conyza; for ID

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Name: Lynne
Houston, TX. Zone 9b (Zone 9b)
Enjoys or suffers hot summers I helped beta test the first seed swap
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LynneHTx
Apr 12, 2015 8:26 AM CST
Am working to identify what's growing in my yard. I don't think I planted this (sometimes the birds bring gifts). Or....maybe I did plant it and forgot. I'm talking about the lighter green plant in the photo. Anyway, the leaves are < 1" wide and over 6-8" long. They have little hairs on them and the stem is hairy as well. About a foot tall now.

Thanks, Lynne

Thumb of 2015-04-12/LynneHTx/132a75

Name: Zuzu
Northern California (Zone 9a)
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zuzu
Apr 12, 2015 8:10 PM CST

Moderator

I spend a lot of time pulling that one out of my flower beds, Lynne. I don't know the name, but I know I don't want it. Smiling
Name: josephine
Arlington, Texas (Zone 8a)
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frostweed
Apr 13, 2015 6:58 AM CST
It is called Horseweed, Conyza canadensis Smiling
http://www.eattheweeds.com/conyza-canadensis-herb-fire-food-...
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Name: Lin
Florida (Zone 9b)
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plantladylin
Apr 13, 2015 7:10 AM CST
I agree, looks like Horseweed that I pull from my yard too:

Horseweed (Conyza canadensis)

http://www.wildflower.org/plants/result.php?id_plant=COCA5

http://foragefax.tamu.edu/2013/05/29/weed-of-the-week-horsew...
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Name: Lynne
Houston, TX. Zone 9b (Zone 9b)
Enjoys or suffers hot summers I helped beta test the first seed swap
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LynneHTx
Apr 13, 2015 8:01 PM CST
Thanks. I think that's it. On the other side of the house, I just pulled some of those flowers. I knew I didn't plant them, so was afraid they would be too 'happy'. Pulled them and didn't pay attention to the stems and leaves. Perfect match to the online photos. And they are growing under a tree where birds could have left them.

Thanks,
Name: Dave Paul
Puna, HI (Zone 10b)
Live in a rainforest, get wet feet.
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Metrosideros
Apr 13, 2015 9:51 PM CST
Looks like Conyza bonariensis, Hairy Horseweed.

Conyza canadensis is a smaller plant.

http://plants.usda.gov/core/profile?symbol=COBO

http://www.calflora.org/cgi-bin/species_query.cgi?where-calr...
Name: Kent Pfeiffer
Southeast Nebraska (Zone 5b)
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KentPfeiffer
Apr 14, 2015 10:03 PM CST

Moderator

LynneHTx said: And they are growing under a tree where birds could have left them.

Thanks,


They don't need help from the birds. The seeds are wind dispersed.

Name: Jay
Nederland, Texas (Zone 9a)
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Horntoad
Apr 15, 2015 7:59 AM CST
[quote="Metrosideros"]Looks like Conyza bonariensis, Hairy Horseweed.

Conyza canadensis is a smaller plant.

http://plants.usda.gov/core/profile?symbol=COBO

]http://www.calflora.org/cgi-bin/species_query.cgi?where-calr...

I think you got it backwards. Conyza bonarienses only reaches about 2.5 feet and Conyza canadensis can reach a height of 7 feet. But the one in the photo is still young and has not reached it's full height yet, so I don't think that can be used as an ID.

http://www.illinoiswildflowers.info/weeds/plants/horseweed.h...
http://www.iewf.org/weedid/Conyza_bonariensis.htm

wildflowersoftexas.com
texasnatureonline.com


Name: Dave Paul
Puna, HI (Zone 10b)
Live in a rainforest, get wet feet.
Plant Identifier
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Metrosideros
Apr 15, 2015 10:06 AM CST
C. bonariensis gets 4 to 8 ft. tall with leaves to 6 in. long by 1 inch wide. Leaves are densely pubescent.

C. canadensis get 5 to 6 ft. tall with leaves 1.5 to 4 in. long by 0.1 to 0.25 in wide. Leaves are glabrous to coarsely hirsute.

The leaves in the above photo are too large and fuzzy to be C. canadensis.
Name: josephine
Arlington, Texas (Zone 8a)
Hi Everybody!! Let us talk native.
Native Plants and Wildflowers Organic Gardener Butterflies Garden Ideas: Master Level Forum moderator I was one of the first 300 contributors to the plant database!
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frostweed
Apr 15, 2015 1:31 PM CST
Why don't we just call it Horseweed, or Conyza, and be happy with that? Smiling
Wildflowers are the Smiles of Nature.
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Name: Kent Pfeiffer
Southeast Nebraska (Zone 5b)
Charter ATP Member I was one of the first 300 contributors to the plant database! Plant Database Moderator Plant Identifier Region: Nebraska Forum moderator
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KentPfeiffer
Apr 15, 2015 6:15 PM CST

Moderator

I don't have (much) of an opinion about which species it is. But, I do know this, Conyza canadensis is a highly variable species. It's leaves can be very rough and hairy (which is what coarsely hirsute means) or very smooth (glabrous). I've seen flowering individual plants anywhere from 6 inches to 10 - 15 feet tall. Leaf size is similarly variable. In short, the plant pictured in the original post absolutely CAN be Conyza canadensis, although you might have to wait for flowers to be sure which species it is. That said, I wouldn't recommend allowing it to flower since both species are a pain in the rear in garden situations.

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