02203nas a2200157   4500008004100000245006500041210006500106300001200171490000800183520165000191653009301841100002501934700002101959700001601980856004901996       2001                        eng d00aPhylogenetic patterns in Northern Hemisphere plant geography0 aPhylogenetic patterns in Northern Hemisphere plant geography  aS41-S520 v1623 aGeological and climatological processes that have impacted the biota of the Northern Hemisphere during the Tertiary are expected to yield little resolution when are cladograms are compared without taking the timing of diversification into account. In an attempt to establish a set of appropriate phylogenetic comparisons, we distinguish between a Pacific track involving (minimally) China, Japan, and eastern North America but not Europe, and an Atlantic track involving China, Europe, and eastern North America but not Japan (or, in most cases, western North America). Within the two Atlantic-track taxa considered here - Liquidambar and Cercis - European and North American species are more closely related to one another than they are to the Asian species. Within a set of five Pacific-track taxa - Hamamelis, Weigela-Diervilla, Triosteum, Buckleya, and Torreya - we see all possible relationships involving China, Japan, and eastern North America. Estimates of minimum divergence times between Old World and New World lineages, based on molecular and fossil evidence, differ markedly between the two Atlantic-track clades. Among the Pacific-track taxa, we find no correlation between pattern of area relationships and estimated divergence times of the Old World-New World disjuncts. Instead, we see a wide range in the timing of these splitting events among and within phylogenetic patterns. Despite the existence of a variety of patterns, inferred ancestral areas and divergence times can be explained by assuming initial diversificiation within Asia in a number of lineages, followed by iterative trans-Beringian dispersion and vicariance.10abiogeography, dispersal, vicariance, phylogeny, Northern Hemisphere, North America, Asia1 aDonoghue, Michael, J1 aBell, Charles, D1 aLi, Jianhua  uhttps://juncaginaceae.myspecies.info/node/92