Verbatim text: Petersen, R. L. and D. E. Fairbrothers. 1983. Flavonols of the fern genus Dryopteris: Systematic and morphological implications. Bot. Gaz. 144: 104--109.
Author: Petersen, R.L., Fairbrothers, D.E.
Year: 1983
Title: Flavonols of the fern genus Dryopteris: Systematic and morphological implications
Journal: Bot. Gaz
Volume: 144
Pages: 104–109