NOTE In DeRebus I 1994 T. purpurea and T straminea were split with no reason given. Therefore the description has been taken from Mez 1934. In Mez's key the difference was shown as 'Floral bracts less or equalling the sepals for T. straminea and floral bracts a little exceeding the sepals for T. purpurea'. BUT in his descriptions he has T. straminea bracts 18mm sepals 16mm, sessile? and T. purpurea bracts 12mm sepals 11mm with pedicel up to 5mm!!! Whereas Baker in 1889 says T. straminea has calyx reaching the tip of the bract and T. purpurea has calyx as long as the bract. —SeeSmith & Downs 1977