This article is the result of field study of several Acrostichum aureum L. and A. danaeifolium Langsd. & Fisch. populations in the swamps of South Florida. It was made with the object of establishing consistently applicable diagnostic differences between these oftimes confused species. Our observations will facilitate field identification, and we also have found some pertinent ecological differences between the two species. No attempt has been made to resolve the possibly more complex problem of Acrostichum in the Asian tropics, where in addition to two distinct and widely distributed species (Troll, 1933), there may be locally differentiated forms which have remained insufficiently examined, as in New Caledonia. The differential characteristics which our study has elucidated are summarized in the following key:
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Adams et al. (1979) studied this question.
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