@article {3593,
	title = {Embryology of Petrosavia (Petrosaviaceae, Petrosaviales): evidence for the distinctiness of the family from other monocots},
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	volume = {122},
	year = {2009},
	month = {2009///},
	pages = {597 - 610},
	author = {Tobe, H. and Takahashi, H.}
}
@article {2869,
	title = {Pollination biology of the saprophytic species Petrosavia sakuraii (Makino) van Steenis in central Japan},
	journal = {J. Plant Res.},
	volume = {106},
	year = {1993},
	month = {1993///},
	pages = {213 - 217},
	author = {Takahashi, H. and Nishio, E. and Hayashi, H.}
}
