Any ideas as to what this is? I am very curious! :D

not great pix.. as the leaves face away ...

but nasturtium comes to mind ...

kenm

Not Nasturtium.

Nothing I recognise, but as Ken said, the pictures are hard to interpret.

Thank you and I know. I apologise, it is very vague. I will post once more developed. The next leaf emerging appears to show more definition, but that may be a few days out. It would have been something slightly more rare, but I am not sure what. Most of my seeds come from botanical gardens.

If this is any reference all seeds were from either Mildred Mathias Botanical Gardens, Huntington Library or The Getty Center.

I'm wondering if it is not some form of Aristolochia. There is at least one native to California and it seems like native plant seeds would be common at local botanical gardens.

Some kind of Abutilon?

Why are you thinking it is a vine? Does it have tendrils?

Not the right shaped leaf for abutilon - they have maples shaped leaves, hence the common name of flowering maple. And the OP indicated vine seeds were all that were planted, so a pretty safe bet it is some sort of vining plant :-)

A parenthetic note since I'm not strongly promoting that the photo shows an abutilon-- The abutilon I'm most familiar with has generally heart shaped leaves, but are blunter on the tip when seedlings.
velvetleaf abutilon

I agree, it would appear to have a resemblance to Aristolochia. I do have A. littorals seeds, but those were only planted in one corner and they are just now sprouting, plus they generally grow more slowly I have found. This plant was very quick in growth with a very thick stem. They have diminutive thorns (most likely for climbing versus defense, although they may get larger). They seem to have more hair than standard Aristolochia.

Certainly would be helpful to see the plant a bit more developed. And do you know exactly what type of vine seeds you planted?....before they were mixed up :-) That might help to narrow things down.

I am usually much more organized with my plantings, but toward the end I was frustrated that a rare Passiflora did not germinate so I threw in a smorgasbord of seeds in a bag that was entirely of vining plants from various gardens (as this pot already had two Passiflora varieties). Confirmed: in pot A. litoralis, Passiflora antioquiensis, P. membranacea, P. bogotensis (which did not germinate).

I have not been able to find any that look like these leaves. What mystery. Excited to see what it becomes. Any chance that somebody on here would have more Passiflora bogotensis seeds that I could have/trade for since mine did not germinate?

It reminds me of lablab purpureus, Hyancinth bean vine, aka dolichos lablab

Funny that you should mention that as I did have L. purpureus in my past garden and in a pot that I gave away. You are right, but the spikes and the hairs made me think otherwise. I do not remember planting L. purpureus in this pot though. Perhaps another Lablab variety?

A more detailed look at the spines growing on the leaf.

I see no spines on my lablab purpureus leaves, which also exhibit a characteristic purple color in the veins, unlike your photo. Keep looking, I guess.

Gary

Some Solanum species have spines on the leaf reverse.

True. I'll keep that in mind as it matures. I have Solanum quitoense and Solanum pyracanthon, both are growing quite well and look nothing like this though. This is a truly intriguing mystery! :D

Another photo of the plant. New set of more mature leaves...

Not a plant I know, but the trifoliate leaves resemble Coral Tree, Erythrina lysistemon. It's supposed to have quite beautiful seeds - vivid red.

Certainly we seem to be in the Fabaceae.

Exactly. Everything points toward the Coral Tree (the bark, the leaf structure...), after all I live in LA. I just do not recall spikes on the leaves last time that I saw a seedling. Is that normal? If Erythrina lysistemon, have you heard of creating a bonsai out of it?

I mean it has to be a Coral Tree, but with the spikes, what cultivar I wonder?Once the base began swelling, I knew that it was something different, but I do not want to completely rule out a vine. With the leaf structure being almost identical, I believe that all is narrowed down now.