Professor Robert Scotland with the Evolutionary Tree of Ipomoea (image) Pensoft Publishers Share Print E-Mail Caption Professor Robert Scotland with the evolutionary tree of the studied genus -- Ipomoea. The study involved DNA sequencing of 2,000 specimens. Credit John Baker Usage Restrictions CC-BY 4.0 Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.