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Bidens Species?
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Posted by
jekeesl Central AR - Z7 (
My Page) on
Wed, May 30, 12 at 16:18
| I found a small group of plants along the road today in heavy shade. That area appears to stay fairly damp, but does not have standing water close by. The plants were about 2 feet tall, with flowers about 1 inch across. They had simple, coarsely toothed, mostly opposite leaves with petioles. The leaves and stems were hairy, and stem hairs were hooked as shown below. If these are a Bidens species, they key out to B. mitis using the Flora of Arkansas key. That species would be unexpected in this area. I should mention that it has been extremely dry here, so some plants may not look "typical". Can you determine species?
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Follow-Up Postings:
RE: Bidens Species?
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| What made you think Bidens? Since you are using photobucket, could you post full size pictures there? It might be nice to see the center of the flower. |
RE: Bidens Species?
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| Esh, the back of the flower reminded me of Bidens, but I'm probably not even close. There's a larger photo of the flower on photobucket now per your suggestion. |
Here is a link that might be useful: Close up of flower
RE: Bidens Species?
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| My guess would be a Silphium perhaps - even that I am not confident of. The picture you show of the back of the flower - those are the bracts (the green parts); would you say it has two rows of them? |
Here is a link that might be useful: Pictures of bracts
RE: Bidens Species?
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| Esh, the photo of the back side of the flower is typical of the other 3-4 I checked. There may be a double row, but I don't have any additional info on that. I don't think this looks like any Silphium species in this area. I returned and pressed a specimen, in case the plant is unusual. The root was spread out, with no central taproot, so it's a perennial. The sample that I collected had 6 stems rising from the root, with stems 0.100-0.125 inch across. |
longshot?
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| Helianthus microcephalus? |
Here is a link that might be useful: Helianthus microcephalus
RE: Bidens Species?
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| Saltcedar, I think that's the right species. This is well southwest of its known range, but H. microcephalus (as described in the Flora of North America key) fits fairly well. I'll go with that i.d. unless somebody can offer a better option. Thanks a bunch! |
RE: Bidens Species?
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| It doesn't seem the stem is hairy enough to be that. Plus the flowering time is off quite a bit (I know things are weird this year). The bracts don't look right for Helianthus at all. |
RE: Bidens Species?
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| Yeah, those bracts are really confusing. I'm thinking they could be poorly developed because we've only had 1.09 inches of rain in the past 60 days (normal is more than 10 inches for that period). And our record high temperatures have caused many species to bloom several months or more early. I'm seeing Solidago and Lespedeza plants trying to flower that usually bloom in August here. |
RE: Bidens Species?
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| Determined this is a dried-up example of Heliopsis helianthoides, which is commonly called Ox-eye Sunflower. Thanks for the point in the right direction, esh. |
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