BioStor
Cyathea arborea (L.) Sm.
 | ∑Miocene fossil woods from the Columbia basalts of Central Washington. J. Arnold Arb. 42: 165--203. U & E S Barghoorn Prakash (1961) Journal of the Arnold Arboretum 42: 165-203 |
 | Recurring Hybrid Formation in a Population of Polystichum x potteri: Evidence from Chloroplast DNA Comparisons Diana B Stein and David S Barrington (1990) Annals of the Missouri Botanical Garden 77: 334-339 |