P. P. Douglas

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6 collections found. 6 collections shown.

P. P. Douglas (525)

Marsileaceae Marsilea macropoda A. Br. - United States of America

P. P. Douglas (514)

Osmundaceae Osmunda cinnamomea - United States of America

P. P. Douglas (513)

Pteridaceae Cheilanthes alabamensis (Buckl.) Kunze - United States of America

P. P. Douglas (504)

Pteridaceae Cheilanthes feei Moore - United States of America

P. P. Douglas (495)

Pteridaceae Cheilanthes horridula Maxon - United States of America

P. P. Douglas (536)

Selaginellaceae Selaginella riddellii Van Eseltine - United States of America