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1 Tree was published in this study

Chloroplast and nuclear gene sequences indicate late Pennsylvanian time for the last common ancestor of extant seed plants.
Savard, Li, Strauss, Chase, Michaud, Bousquet. (1994). Proc Natl Acad Sci U S A.
Magnoliophyta Coniferophyta
0 70 140 210 284 Time (MYA)
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