1) Mustard (in Greek
σινάπι) is a herbaceous plant ,
Sinapis alba, belonging to the family of
Cruciferae, present in all the Mediterranean area, ...it can become like a very small bush, but never like a tree...so the phrase ῶν
λαχάνων ἐστὶ καὶ γίνεται
δένδρον, is already contradictory in itself because a vegetable cannot become a tree.
So whoever thinks that
Sinapis alba can become a tree (or a sort of) is not normal.
2) What some genius here calls "mustard tree" is
Nicotiana glauca, which is from the Americas...so has nothing to do with the Mediterranean area.
It's not even the
Salvadora persica...because the Greek term is σινάπι, which is only and exclusively
Sinapis alba.
3) The OP expects some rational argument here. Well...for a person who has always seen entire fields covered with
Sinapis alba, I think only a madman would compare them to trees..
4) The alleged divine omniscience is pure speculation....some people claim that Jesus knew English back then, even if at that time it didn't even exist yet.
5) So, if there is someone who claims Jesus did know mustard seeds were not the smallest ones...well let us draw a merciful veil...
I think it amounts to more than an opinion.
The mustard seeds in question come from the plants, sometimes bushes, of the Brassicaceae family, whereas the mustard tree is a different plant belonging to a different family: Salvadoraceae
.
No...the Greek term sinapi,sinapeos has nothing to do with the Salvadora persica