In message , someone
writes
I have grown a lot of Rehmannia angulata from seed. My question is, are
they Gesneriaceae or Scrophulariaceae?

Quite possibly neither. I presume that you've seen

URL:http://en.wikipedia.org/wiki/Rehmannia

In addition to the references there, there is a 2006 review by Tank et
al

URL:http://www.isu.edu/~kelchner/website...files/Tank_eta
l_2006.pdf

and a paywalled 2007 paper by Albach et al

URL:http://www.sciencedirect.com/science...L&_udi=B6T4R-4
MNYK1J-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view =c&_acct=C000050
221&_version=1&_urlVersion=0&_userid=10&md5=573a9a 4e3f1aba9ac9419430e3c60
8de

It looks to lie in the vicinity of Phyrmaceae, Paulowniaceae and
Orobanchaceae, but might end up in a new family Rehmanniaceae.
--
Stewart Robert Hinsley