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See DI02/14: A Key to Tillandsia subgroup diaphoranthema.
From FCBS.... "There are several groups within Tillandsia and some may be raised to generic status.
One of these groups contains the very small Tillandsias and are called Diaphoranthema, with the world authority being Dr Walter Till.
Dr. Till does most of his publishing in the German Journal 'Die Bromelie'. His main paper on Diaphoranthema is in Selbyana 13; 88-94 1992.
The 4th group proposed in Diaphoranthema is the RECTANGULA Group.
This group includes aizoides, brealitoensis, erecta, funebris, pedicellata, and rectangula."
Ken Woods 09/09.
Ian Hook 07/11.
George Nieuwenhoven 12/14. Flowers approx. 2mm across.