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A study of variation in the cytotypes of Dryopteris spinulosa

, : A study of variation in the cytotypes of Dryopteris spinulosa. Rhodora 68(773): 59-92

U.S. material of P. intermedia is diploid and of D. spinulosa tetraploid. Where the 2 spp. mingle, triploid hybrids (P. triploidea) occur abundantly. It is suggested that D. spinulosa is an allopolyploid, 1 parent being a variant of D. intermedia and the other unknown.


DOI: 10.2307/23311604

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