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Prostrate Rosette
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Posted by
jekeesl Central AR 7b (
My Page) on
Mon, Nov 12, 12 at 13:28
| Today, I found several of these mostly prostrate plants in disturbed soil, in a sunny, open area. They were 6 to 12 inches across, and without flowers or fruit. Leaves were non-symmetric in form, and alternate along the stems.
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Follow-Up Postings:
RE: Prostrate Rosette
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Common ragwort, Senecio jacobaea?
hortster |
RE: Prostrate Rosette
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| No, it's not Ragwort. But I don't know what it is. |
RE: Prostrate Rosette
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RE: Prostrate Rosette
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| Picking up on jekeesl's suggestion, I found this (interesting): |
Here is a link that might be useful: Aphanes microcarpa
RE: Prostrate Rosette
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Here is a link that might be useful: Erodium cicutarium
RE: Prostrate Rosette
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RE: Prostrate Rosette
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| Thanks for the replies, but no golden ticket yet. Gary, I no longer think Aphanes microcarpa is right, because the leaf shape is a bit off and its leaves have long hairs. The leaves on my plant seem to be smooth. Carol, we do have small populations of Erodium cicutarium here (one of my favorite plants), and they are smaller, more hairy, and have more acute leaflet divisions than the unknown. Jaynine, I didn't find any Cardamine species that fit. In fact, I got desperate and searched for "basal rosette" photos. After 50 or so pages, I gave up on that too. I'm wondering if it will be something in the Mustard family, but don't recall any of those that have such non-symmetrical leaflets with ultimate divisions oriented mostly toward the tips of the leaves. I think I'll just put this on my "revisit" list for next year, and call it a day. |
RE: Prostrate Rosette
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RE: Prostrate Rosette
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| It looks a lot like Lesser Swinecress (Coronopus didymus), a winter annual, but I haven't convinced myself fully yet. |
RE: Prostrate Rosette
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| Funny you should mention C. didymus mistascott. I found that species at the same location. But the larger plants of the unknown did not have flowers or fruits, and the leaflet shapes were different. I don't have any easy way to check stems, but here's a photo from the same area of C. didymus for comparison. 
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RE: Prostrate Rosette
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- Posted by nankeen z8b Portland OR (My Page) on
Thu, Nov 15, 12 at 12:04
| Something related to Horkelia? I know it's not native... |
Here is a link that might be useful: Horkelia clevelandii
RE: Prostrate Rosette
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| Nankeen, that's an interesting genera, but not likely present in Arkansas. The 19 species listed by BONAP are all in the western 1/3 of the US. |
RE: Prostrate Rosette
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| Nankeen, that's an interesting genera, but not likely present in Arkansas. The 19 species listed by BONAP are all in the western 1/3 of the US. |
RE: Prostrate Rosette
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| Nankeen, that's an interesting genera, but not likely present in Arkansas. The 19 species listed by BONAP are all in the western 1/3 of the US. |
RE: Prostrate Rosette
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| Nankeen, that's an interesting genera, but not likely present in Arkansas. The 19 species listed by BONAP are all in the western 1/3 of the US. |
RE: Prostrate Rosette
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| Nankeen, that's an interesting genera, but not likely present in Arkansas. The 19 species listed by BONAP are all in the western 1/3 of the US. |
RE: Prostrate Rosette
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| Nankeen, that's an interesting genera, but not likely present in Arkansas. The 19 species listed by BONAP are all in the western 1/3 of the US. |
RE: Prostrate Rosette
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Just for the record, I did not submit multiple messages |
RE: Prostrate Rosette
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| I was thinking Erodium too, Carol. What about E. cicutarium? |
RE: Prostrate Rosette
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| genus (singular), genera (plural), if interested. |
RE: Prostrate Rosette
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| Thanks for the reminder gsp. |
RE: Prostrate Rosette
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| I do find it closely resembles this rosette that was identified as Lesser Swinecress (perhaps incorrectly). So, I do think it is a Mustard family plant. |
RE: Prostrate Rosette
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| You're probably right mistascott. When I cropped down both photos, the ultimate leaflet segments were very similar, as were the stems. I'm wondering if the floweing plants look different because the leaflets expand as the plant mature. Maybe the unknown is just a younger specimen. In any case, I'll return in a few weeks and confirm. Thanks for the help. |
RE: Prostrate Rosette
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| This is similar to one posted in the Weeds forum in the summer; take a look at the link and see what you think. |
Here is a link that might be useful: Weeds forum post on similar weed
RE: Prostrate Rosette
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| I don't think it is bittercress based on that comparison -- the leaves are different (uniformly lobed and ovate). But here is another picture of Lesser Swinecress that still has me thinking this could be it (from http://www.ipm.ucdavis.edu/PMG/C/W-CF-CDID-LS.001.html). In any event, I really want to know what it ends up being because this one was a real puzzle! |
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