2016/11/17 - Evolution, Volume 34, Issue 2, 1 February 2017, Pages 262–281, https://doi.org/10.1093/molbev/msw242 (6) Holodiscus lisii found in Florissant, Colorado, USA, has been dated to 34.1 Ma in Late Eocene (Schorn book Flora of North America (floranorthamerica.org), Flora Republicae Popularis Sinicae (http://frps.eflora.cn/ 1679. –. 1691 . Google Scholar · Crossref · .