Most of us know our oak from our ash. But what about your Guelder-rose from your Wayfaring Tree? And what about if they don't have any leaves on???! This quiz aims to sort out the twigmasters from those who can't see the wood for the trees! If you'd like to get to know your winter trees better why not buy a copy of Winter trees: a photographic guide. All the profits go to The Species Recovery Trust, which is looking after some of the UK's rarest species. Or come on one of our training courses! If you like this quiz, why not try our Grasses and Sedges ones? All photos by Leif Bersweden and Dominic Price.