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Plant Identification: SOLVED: Small, yellow wildflowers on 8 foot stalk

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Forum: Plant IdentificationReplies: 6, Views: 101
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jehartg
Baton Rouge, LA

June 29, 2012
3:23 PM

Post #9186644

Growing at Bluebonnet Swamp in Baton Rouge, LA.
Small yellow flowers (about 3/8 inch diameter)
On a stalk that is 8 to 9 feet tall.
Stem in about 3/4 inch in diameter near the btm.
Growing in a sunny meadow area at the edge of a swamp.
On high ground (not wet).

Photos taken on 6/29/12.

John

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anapatty83
Managua
Nicaragua

June 29, 2012
3:55 PM

Post #9186680



Lactuca serriola ??
anapatty83
Managua
Nicaragua

June 29, 2012
3:57 PM

Post #9186686

See link : http://www.invasive.org/weedcd/species/5918.htm

trackinsand

trackinsand
mid central, FL
(Zone 9a)

June 29, 2012
4:48 PM

Post #9186732

nice pictures!
good website too!
jehartg
Baton Rouge, LA

June 29, 2012
5:53 PM

Post #9186789

I just got back from another visit to the plant.
Too dark for pictures, but...

Cut a leaf from the stem.
A milky sap oozed from the cut, as it should for lactuca serriola.

I did NOT find prickles on the underside of the mid veins.
I did NOT find prickles on the stem.
There are a few prickles on the outer edges of some leaves.

It may not be "prickly lettuce" (lactuca serriola), but maybe something closely related (???).
Maybe some plants of "prickly lettuce" don't have many prickles (???).
Thanks for the lead and the good link.

John
meltonw
Mobile, AL

June 29, 2012
8:25 PM

Post #9186980

It looks like Lactuca canadensis, Canada lettuce.
jehartg
Baton Rouge, LA

June 30, 2012
4:57 AM

Post #9187173

PlantFiles: Canada Lettuce, Tall Lettuce, Tall Wild Lettuce - Lactuca canadensis
http://davesgarden.com/guides/pf/go/53158/

I think meltonw has got it!
Thanks to all who commented.
Fun, as always.

I found this to be a helpful reference for this plant:
http://www.illinoiswildflowers.info/prairie/plantx/wild_lettucex.htm

John

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