The version I got of my post in my email program left out the dash between 12 and 17 and 18 and 26 that was there when I posted and appears in the highlighted text when I hit reply. I'm not sure why that happened and since email programs are different, it may not have happened to others. But it should be: 12 to 17 mm for T. montana 18-26 mm for T. hendersonii At 07:09 AM 5/19/2014, you wrote: > From the Flora of North America key: >Perianth 1217 mm; filaments more than 1/2 as >long as perianth lobes = T. montana >Perianth 1826 mm; filaments less than 1/2 as >long as perianth lobes = T. hendersonii