The presumably original version is "I'll Twine 'mid the Ringlets", which dulcimer mentioned, and in the DT it starts like this:

I'll twine 'mid the ringlets of my raven black hair
Rhe lilies so pale and the roses so fair
The myrtle so bright with an emeral hue
And the pale aronatus with eyes of bright blue.

I left in the typos because they make we (I mean Me) wonder whether "aronatus" is a typo. But if it isn't, and you want to know what the lyricist meant, that's the word to research. I'm not saying for a minute that it's the word you should sing.

(Incidentally, one songbook I learned this from has "armita"--you sing "pale" on two notes--and another gives the fourth line as "Said I, knowing not that my love was untrue".)