▁ ▁wide . ▁The ▁shape ▁and ▁cutting ▁of ▁the ▁bl ades ▁is ▁highly ▁variable . ▁The ▁lower ▁third ▁of ▁the ▁bla de ▁is ▁p inn ate ▁( cut ▁all ▁the ▁way ▁to ▁the ▁ra ch is ▁and ▁attached ▁by ▁a ▁narrow ▁costa ) ▁to ▁p inn atif id ▁( cut ▁into ▁deep ▁lo bes ▁f used ▁across ▁the ▁ra ch is ). ▁There ▁are ▁typically ▁no ▁more ▁than ▁three ▁pairs ▁of ▁pin na e , ▁and ▁sometimes ▁even ▁the ▁most ▁bas al ▁part ▁of ▁the ▁leaf ▁is ▁p inn atif id . ▁The ▁upper ▁portion ▁of ▁the ▁leaf ▁is ▁lo bed , ▁coming ▁to ▁an ▁ac ute , ▁straight - s ided ▁tip ▁at ▁the ▁end ▁of ▁the ▁leaf . ▁The ▁leaves ▁have ▁a ▁few ▁fine , ▁soft ▁hair s ▁on ▁the ▁upper ▁surface ▁only . ▁ ▁The ▁ra ch is ▁( central ▁axis ▁of ▁the ▁leaf ) ▁is ▁sh iny ▁and ▁hair less , ▁re dd ish ▁or ▁pur pl ish ▁brown ▁at ▁the ▁base ▁f ading ▁to ▁green ▁towards ▁the ▁tip . ▁The ▁pin na e , ▁when ▁present , ▁are ▁tri angular ▁to ▁narrow ly ▁tri angular , ▁ ▁in ▁length ▁and ▁ ▁in ▁width . ▁Exception al ▁spec im ens ▁may ▁reach ▁ ▁in ▁length ▁and ▁ ▁in ▁width . ▁The ▁bases ▁of ▁the ▁pin na e ▁are ▁squ ared ▁off ▁or ▁obt us ely ▁ang led , ▁and ▁have ▁small ▁lo bes ▁on ▁either ▁side . ▁The ▁edges ▁of ▁the ▁pin na e ▁may ▁be ▁smooth , ▁or