Corypha umbraculifera or Talipot Palm is a large monocarpic single trunked palm native to India and Sri Lanka. It is most often found near human settlements and is used for thatch, umbrellas, writing material. More Here
Although the Garden’s specimen has a long way to go before it reaches the size of the one in the photo (taken on private property with Garden Manager Sean Callahan to show scale), It is still quite impressive with leaves that can be 16 ft in diameter!
When it eventually goes into flower it will be quite a show. It has the largest inflorescence of any plant with several million flowers borne on a branched stalk that forms at the top of the trunk. The fruit will take about one year to mature and after that the Palm will die.