Ligularia 'Savill Spire', early August. One of two clumps growing in the Savill Garden, Windsor. Similar to both Ligularia veitchiana and Ligularia wilsoniana, yet sufficiently different to have been given its own cultivar designation by Mark Flanagan, Keeper of the Savill Garden. http://www.rhs.org.uk/Plants/RHS-Publications/Journals/The-Plantsman/2011-issues/June/Ligularia