You tried going to https://rieseberglab.botany.ubc.ca/loren%20pubs/1991%20Evol%20Trends%20in%20Plants%20Rieseberg%20et%20al.pdf, and it doesn't exist. All is not lost! You can search for what you're looking for.
https://rieseberglab.botany.ubc.ca/loren%20pubs/1991%20Evol%20Trends%20in%20Plants%20Rieseberg%20et%20al.pdf