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Plant Identification: SOLVED: Water Primrose - 2 types

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jehartg
Baton Rouge, LA

August 15, 2012
6:46 PM

Post #9242947

From Bluebonnet Swamp Nature Center in Baton Rouge, La.

We seem to have two species of Water Primrose growing around a small, sunny pond.
I can't find anything to distinguish type A from Type B except that one has bigger blossoms, longer leaves and longer seed pods.
Both have flat sided stems.
Leaves and stems of both types start off green and turn red as they get older.

My best guess is the the one with larger parts (I call it Type B) is:
Shrubby Water Primrose, Mexican Primrose Willow
Ludwigia octovalvis
http://davesgarden.com/guides/pf/go/62774/

I don't even have a guess for Type A.


John

Thumbnail by jehartg   Thumbnail by jehartg   Thumbnail by jehartg   Thumbnail by jehartg
Click an image for an enlarged view.

themoonhowl

themoonhowl
Prairieville, LA
(Zone 9a)

August 16, 2012
7:38 AM

Post #9243343

Perhaps Ludigia decurrens Walt for the larger one.

http://plants.usda.gov/plantguide/pdf/pg_lude4.pdf


I find this list helpful in figuring out some of our natives
http://www.wildflower.org/collections/collection.php?start=90&collection=LA&pagecount=10
jehartg
Baton Rouge, LA

August 16, 2012
8:02 PM

Post #9244180

Actually, I think Ludigia decurrens Walt - Willow Primrose (or upright primrose, or wingleaf primrose-willow, or primrose-willow) is what I have been calling Water Primrose A - the one with smaller flowers, smaller seed pods and smaller leaves.

See the attached image for why it is sometimes called "wingleaf primrose-willow".

The seed pods for Ludigia decurrens Walt are listed as being 3/4 to 1 inch long, like Water Primrose A.

My best guess is the the one with larger parts (I call it Type B) is still:
Shrubby Water Primrose, Mexican Primrose Willow
Ludwigia octovalvis
http://davesgarden.com/guides/pf/go/62774/

John

Thumbnail by jehartg
Click the image for an enlarged view.

themoonhowl

themoonhowl
Prairieville, LA
(Zone 9a)

August 17, 2012
7:33 AM

Post #9244480

I actually thought Type A was the "Taller" of the two...and that is the plant I was referring to when I said "Larger" and Ludigia decurrens Walt. Sorry for not being more precise.

I do think you are correct about Type B, Ludwigia octovalvis.

I ran across this link from Wildlife and Fisheries on rare plant species in LA..The first link is info, the second link is animal and then plant lists by parish. I thought you might find them useful.

http://www.wlf.louisiana.gov/wildlife/rare-plant-species

http://www.wlf.louisiana.gov/wildlife/species-parish-list

Moon/Jean
jehartg
Baton Rouge, LA

August 17, 2012
6:15 PM

Post #9245100

Thanks for the help, Moon/Jean.
I was hoping there was some miscommunication.

Thanks for the links to Louisiana rare species list too.

For Shrubby Water Primrose, Mexican Primrose Willow - Ludwigia octovalvis,
it is often mentioned that it has woody stems or is woody at the bottom.
One of ours is very woody with the "stem" almost 1 inch in diameter at the bottom.
(See image attached to this message.)

==========================================
I am pretty comfortable that Primrose A is:
Ludigia decurrens Walt - Willow Primrose (or upright primrose, or wingleaf primrose-willow, or primrose-willow)

And Primrose B is:
Ludwigia octovalvis - Shrubby Water Primrose, Mexican Primrose Willow
(This is the one with bigger blossoms & longer leaves and longer seed pods.)

I will post it as solved
But others can still feel free to pipe up with other opinions/comments.

John

Thumbnail by jehartg
Click the image for an enlarged view.

themoonhowl

themoonhowl
Prairieville, LA
(Zone 9a)

August 18, 2012
6:55 AM

Post #9245501

I would say that that qualifies as woody stems...again, sorry for the confusion and you are welcome for the links.

Jean

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