What are these plants (weeds?) that grow everywhere?

[Yossu]

Most of the plants I have indoors (as opposed to the ones in the greenhouse that don't have them) have something growing in the pot. Here are some growing in a Drosera Spatulata pot...

I never took much notice of them before, as they don't seem to be doing any harm. However, they have started to flower, and I'm now intrigued as to what they are. Here is a flower...

The flowers are only tiny, maybe 2-3mm across.

Anyone any idea what they are? Thanks

Edited September 20, 2016 by Yossu

[Blocky71]

That'll be utricularia or common name bladderwort...

They do grow like weeds in amongst the cp's but do no harm , look them up, they are carnivorous themselves and trap prey in their roots.

some have amazing flowers, I don't ' keep' them personally but have found some hitch hikers in my pots.... 

Yours could possibly be utricularia gibba but I'm guessing. I'm sure someone will step in and correct me. 

[lilacina]

It´s U.subulata you have. If you don´t want it spreading over your whole collection repot the drosera and throw the rest in the bin or compost.

Otherwise this utric will conquer each pot with time and sometimes also repress other plants by covering the soil with a dense carpet of leaves.

[Mark Anderson]

Yes definitely u subulata

Mark

[Yossu]

Thanks everyone for the reply. The ironic thing is that one of the first CPs I bought was a U. Longifolia, which has been sitting in a pot next to all these other indoors ones, and has never done anything. It didn't die, but never had more than one or two moderate sized leaves. I was half expecting someone to tell me that these new plants were actually U. Longifolia that had jumped across form the other pot!

I'm not going to worry about them for the moment. They've been there a while and never caused any problems. I actually quite like them! If they start to get out of hand I'll do some repotting, but if they are that invasive, it's unlikely I'd ever clear them out completely.

Thanks again.