Hi guys, I'm confused about what's the difference between the above 3 species as they looked so similar and the different descriptions and photos on the websites... Can some expert kindly advise what's the difference between the 3 in terms of height, leave shape/size/texture or color etc? So far I heard is lucen leaves are thinner and greener while x willisii the leaves are leathery and darker green? the stems for x willisii is shorter as well?