While this plant is in all manner of places in the garden I needed to research to find its name. It is Oxalis Stricta or Wood Sorrell. Apparently it does not do well in shaded places but that does not seem to apply in my garden. It is also high in Vitamin C. Once in the garden, always in the garden I suspect. The bright yellow and very small flower is a positive feature to the attentive eye.
ordinarygoodness 
I have been desperately trying to get rid of the Oxalis in my garden…
It is tenacious stuff. This variety does not seem to have the bulbs that the larger variety has – we also have some of that but I’ve not seen flowers on the larger one.
They’re mainly pink
I think wood sorrell sounds much nicer than oxalis, and even suggests it may be edible
You are absolutely correct Valerie – it is very edible according to this interesting blog site in NZ. http://wildpicnic.blogspot.co.nz/2009/07/wood-sorrel-oxalis-acetosella.html
I thought you might find this TED talk by Dr Suzanne Simard as fascinating as I did re the connection and co-operation between trees – especially as you live in a forested and highly protected area. https://www.ted.com/talks/suzanne_simard_how_trees_talk_to_each_other