What plant / flower is this

Grows wild in my yard. Makes one flower like this. Flower is small

 

You might want to investigate it under begonia.
Margaret

 

Possibly a tuberous begonia....? When does it flower?

 

Well it began flowering about a day or two . Flower wasen't showing two days ago seen it today,I live in the south of Louisiana if that helps. Also have this flower I can't find in any of my plant ID sites.

 

I think your new pix is that of Lathyrus odoratus, or a common sweet pea...what are you day time temp. for March?

 

Temps here have been in the 70's and 80's some days

 

Thank you both, Margaret and K Baron I looked up the names and its a match on both plants. Thanks again . :-)

 

Gosh ...I wish March was as warm as that here in Vancouver...

 

Looks more like something on the order of a vetch (Vicia) or other smaller flowered legume (there are many) to me.

 

I would say Lathyrus, but definitely not L. odoratus.

 

Yeah, I should've just said "smaller flowered" and left out "Vicia."