Distinct family resemblance?

On the left - "Oca -A perennial plant (Oxalis tuberosa) of the high Andes, grown for its edible tubers."
Bought with the intentions of growing/eating it, I'm up for anything different.  I've since heard, a time or two, that the tubers have "a lemony tang"; I wonder if that's also due to oxalic acid?
:¬( )
NOT - the Open College of Arts 
OR 
the Orthodox Church of America; 
both of which were offered in a search for OCA


On the right guessimetrically - "Oxalis corniculata, the creeping woodsorrel, also called procumbent yellow sorrel or sleeping beauty, resembles the common yellow woodsorrel." NOT bought.  Another weed snuck in from somewhere; taken up and moved, Blipping for the use of, to compare more easily.

Of the weed, I found:-
"The leaves contain oxalic acid, which gives them their sharp flavour. Perfectly all right in small quantities, the leaves should not be eaten in large amounts since oxalic acid can bind up the body's supply of calcium leading to nutritional deficiency.  The quantity of oxalic acid will be reduced if the leaves are cooked.~ ~ "
I remember "Old solomon" distinguishing between 
"Eatable - you can eat it but maybe wouldn't want to."
and
"Edible - You would choose to eat it."
Online appears to think thus:-
"Eatable is used more in the sense of food that is not of very high quality but one that can still be eaten.  In fact, eatable is a rather informal term and today used more to describe food items in a party as eatables."
Vs.
"Edible comes from Latin edibilis, which means to eat.  It is a word that describes a food item that can be consumed without harm.  This is a sense that is sought to be conveyed when we talk of edible flowers and edible oils, as well as edible fruits."