I had a chance to use the word didymus when describing the seed pods of Menodora, but forgot, so here: the common name twinberry...
Acaciela angustissima is the former Acacia angustissima. I suspect the name change is about priority. The plant already had a published name and then...
The genus is now Hesperocyparis, but back in the olden days I learned the rough bark Arizona cypress of southeastern Arizona as Cupressus arizonica...