Interesting. Where did you get "musa" for banana from?

I'm actually too lazy to get out of bed to my dictionary shelf to pull out my dictionary of modern words in Latin. Is it from there?

I believe the origin of musa is in Arabic. In Arabic it is called "moz".

It's not a neologism! :)
When we are talking about animals or plants in Latin, we usually take its genus, not its (sub)species... for example, we say "felis", and not "felis catus".

The same with:
dog = canis
camel = camelus
sheep = ovis
horse = equus
penguin = aptenodytes
pepper = piper
rice = oryza
pine = pinus

Of course there are plenty of exceptions, but it's very interesting!

Well, "musa" is the genus... I think we can also say "banana".

Collins dictionary says banana is ariēna [f].

@Eldad, you're probably right. Wikipedia says:
Alii fontes ferunt genus nominari pro Antonio Musa, medicus Augusti imperatoris (Bailey 1916:2076); alii autem ferunt Linnaeum, qui genus anno 1750 nominavit, e mauz, voce Arabica, in Latinum convertisse.¹ Banana, nomen Musae in multis linguis, e voce ipsa Arabica banan 'digitus' deducitur.¹
¹Dan Keppel, Banana (Hudson Street Press, 2008), p. 44.

@Demetrius, it's possible, but some dictionaries don't confirm it:
ARIENA, ae, f. the fruit of the Indian tree pala, PERHAPS the banana, according to Plin.
[A NEW AND COPIOUS LEXICON OF THE LATIN LANGUAGE]