The reorganization of plant families as the result of genetic analysis is an interesting topic. The most recent blog posted here at blackturtle.us/tronanews.com about Notchleaf Phacelia states:
blackturtle.us wrote:Formerly this plant was a member of the Waterleaf Family (Hydrophyllaceae), but it has been reclassified and is now a member of the Borage Family (Boraginaceae).
LINK: http://www.blackturtle.us/BLOG/jan152012.html
I found more info about the Waterleaf/Borage merger at wikipedia:
wikipedia wrote:Hydrophylloideae is a subfamily of the Boraginaceae family of flowering plants. Their taxonomic position is somewhat uncertain. Traditionally, and under the Cronquist system, they were given family rank under the name Hydrophyllaceae, and treated as part of the order Solanales. More recent systems have recognised their close relationship to the borage family, Boraginaceae, initially by placing Hydrophyllaceae and Boraginaceae together in an order Boraginales, and most recently by demoting Hydrophyllaceae to a subfamily of Boraginaceae. However the placement and circumscription of Boraginaceae is still uncertain: it is unplaced at order level, and there is some prospect of it being split up again in future.
LINK: https://en.wikipedia.org/wiki/Hydrophylloideae