English Oak - Quercus robur. You think you're all made up don't you? Find one of these and you know exactly what it is. But is it English Oak? or sessile Oak? OK here's the difference. The English Oak has leaves attached directly to the twig and the Acorns are on stalks. The sessile Oak on the other hand is the opposite stalked leaves and Acorns growing directly off the twig. So now you know. Dontcha just feel great about that.....well you would do except......