BioStor
 | ∑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 |
 | The Malpighiaceae in the southeastern United States K R Robertson (1972) Journal of the Arnold Arboretum 53: 101-112 |