Abstract
SummaryThe wide‐ranging, native North American species Ammannia × coccinea Rottboell (Lythraceae) is determined, on the basis of morphological and cytological evidence, to be an amphidiploid derivative (n=33) of A. auriculata Willdenow (n= 16) and A. robusta Heer & Regel (n = 17). The latter species has not been recognized in modern floras but its specific status is supported by a unique combination of floral and vegetative characters and distinctive chromosome number. Artificial backcrosses produced vigorous, but pollen‐sterile F1's confirming the suggested relationship of the species. Geographical distribution of the complex is presented.
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