It's not a beckettii because I have it in my tanks. The leave edges on beckettii are smooth, even in emersed form. They may look wavy when fully grown but they aren't really. I am not sure what species it is though...It is something else.
I was away from the tank for when they arrived and just returned home today. My wenditi green looks like this. This plant that has no roots looks like this (I have no idea why my brother planted it here). They're also suffering from cryptocoryne melt but they have no roots so I don't know if they'll recover
It could be emerse form of C. Undulata 'red' - but leaves are a little short for emerse C. Undulata.
It is most likely a C. Wedtii and one of the 'green'-types. There are several different in trade and some have more or less brown colouration, depending on light intensity of the tank.