Austin area plant ID

NoviceAustinGardenerAugust 28, 2014

Hello folks, This plant randomly grew in my garden in Austin, TX. Anyone have an idea what it is?

Many thanks!

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lycopus(z5 NY)

Something in the pea family. You might compare to Chamaecrista fasciculata, partridge pea.

    Bookmark   August 28, 2014 at 9:22PM
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NoviceAustinGardener

Thank you so much for that input! I'm thinking it might be Chamaecrista flexuosa. I'll try to get a closer look at the plant tomorrow.

Many thanks!

    Bookmark   August 28, 2014 at 11:08PM
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ken_adrian Adrian MI cold Z5

a rather noxious weed ... the MI variation anyway ...

and that may be proved by your comment that it just popped up.. and the fact that it looks 4 feet tall in your pic ... that might be part of the definition of aggressive.. to many of us ...

ken

    Bookmark   August 29, 2014 at 8:59AM
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nonmember_gw

Chamecrist flowers aren't pea shaped. Sesbania sp?

    Bookmark   August 29, 2014 at 10:45AM
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jekeesl (south-central Arkansas)(7b)

Thinking that is likely Sesbania herbacea. You could also see S. drummondii in your area, but that should only have 10-20 leaflet pairs. Your plant seems to have at least 26 on some branches.

    Bookmark   August 29, 2014 at 11:26AM
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dbarron(z7_Arkansas)

From the looks, it could also be a senna species...

    Bookmark   August 29, 2014 at 11:30AM
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NoviceAustinGardener

Thanks again for everyone's input. I believe there are around 36 leaf pairs. I was hoping it wasn't a weed, but it's looking more and more like it might be. Here's a closeup of the flower.

    Bookmark   August 29, 2014 at 12:50PM
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NoviceAustinGardener

Here is another shot of the plant.

    Bookmark   August 29, 2014 at 12:51PM
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lycopus(z5 NY)

Now that I can see the flowers more clearly I agree it is not Chamaecrista, however Chamaecrista is in the pea family as is this plant.

    Bookmark   August 29, 2014 at 1:01PM
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wantonamara Z8 CenTex

I think it is Sesbania herbier. It has been found both East and West of Travis county according to USDA, so my guess is that it is here also in areas that are not as Alkaline. S. drummundii is different in both flower and leaf. Both are not appropriate for an in town garden. I would definitely deadhead them if you are thinking of letting it grow. Me , I would pull it before it seeds and definitely not let it show you if it is a perennial and sends out plants from its roots. USDA identifies it as both annual and perennial. I do know that the relative . S. drumundii AKA Rattlebox forms LARGE thickets out on the gravel bars of the Pedernales River.If you start to google it it comes up with Sesbania herbacea CONTROL. Always a bad sign. LOL. Rattlebox is an unattractive plant but it serves the purpose of being the first succession of plants to establish plant matter and root mass into an unstable stream bank. I like to hover under it on the gravel bank for shade while I am sitting by the river on a 100F day.

    Bookmark   August 29, 2014 at 3:56PM
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NoviceAustinGardener

Thank you all for your amazing feedback. This plant has to go. Since it appeared quickly and has grown so rapidly, it's way too suspicious. We visited the Wildflower center in Austin yesterday so I have some better ideas on planting some native plants in that area.

Thanks again!

    Bookmark   August 31, 2014 at 9:00AM
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