There's also a completely separate vowel harmony process in some Spanish dialects that have an alternation between high and low vowel allophones. An open allophone at the end of a word triggers using the open allophone in preceding syllables' vowels.
Wikipedia gives some examples:
In Eastern Andalusian and Murcian Spanish, word-final /s/, /θ/ and /x/ (phonetically [h]) regularly weaken, and the preceding vowel is lowered and lengthened:
/is/
/is/→ [i̞ː][i̞ː]e.g. mis [mi̞ː][mi̞ː]('my' pl)
/es//es/→ [ɛː][ɛː]e.g. mes [mɛː][mɛː]('month')
/as//as/→ [æ̞ː][æ̞ː]e.g. más [mæ̞ː][mæ̞ː]('plus')
/os//os/→ [ɔː][ɔː]e.g. tos [tɔː][tɔː]('cough')
/us//us/→ [u̞ː][u̞ː]e.g. tus [tu̞ː][tu̞ː]('your' pl)A subsequent process of vowel harmony takes place so that lejos ('far') is [ˈlɛxɔ], tenéis ('you all have') is [tɛˈnɛi] and tréboles ('clovers') is [ˈtɾɛβɔlɛ] or [ˈtɾɛβo̞lɛ].
- lejos ('far') is [ˈlɛxɔ],
- tenéis ('you all have') is [tɛˈnɛi] and
- tréboles ('clovers') is [ˈtɾɛβɔlɛ] or [ˈtɾɛβo̞lɛ].
They give a citation:
- Lloret, Maria-Rosa (2007), "On the Nature of Vowel Harmony: Spreading with a Purpose", in Bisetto, Antonietta; Barbieri, Francesco, Proceedings of the XXXIII Incontro di Grammatica Generativa, pp. 15–35.
