Most recent scientific name or original?
When a specimen's scientific name varies over time [for example, this one is Digitaria horizontalis in 1969, Digitaria adscendens in 1973, and Digitaria cilaris in 1993], which is the preferred name to record?
The Herbarium FAQ (item 11) says to transcribe only the name from the most recent determination. So in this case, the 1993 name.
If you haven't seen the FAQ yet, check it out. It has lots of useful tips and advice. You can find it here: http://blog.notesfromnature.org/2015/04/14/updated-faq-and-useful-tools-herbarium-interface/