The Consul decapitated a dusty coquelicot poppy growing by the side of the gutter with his stick.
One of Under the Volcano's smaller sentences, but isn't it perfectly-formed? The parade of plosives in the violent first half, petering out into plainness. At the other end of the spectrum is the head-spinning whirlpool of a sentence that opens Chapter 3, diverting the reader's attention, like the Consul's, from the world of objects to the eddying, allusive world of appearances. The writing is sometimes obscure because obscurity is its objective, the obscure, secretive self-deception of the alcoholic. But these misapprehensions, constructed of the endless, sometimes paranoid (but often not) recombination of a few simple motifs and symbols, add up to a reality more cogent, on its own terms, than the outside world, with its imminent apocalypse (see the last words of the antepenultimate sentence of the book). Can you blame the Consul for escaping to a mezcal Disneyland?
The symbols, as I say, aren't hard to fathom. Take gardens — the Consul's (literally undermined) garden, run to riot in the absence of Yvonne, an "indescribable confusion of briars from which the Consul averted his eyes...", complete with snakes literal metaphorical. The little municipal garden next door whose admonitory sign the Consul ironically miscontrues. Yvonne's cowboy riding style which is "not as in gardens". The stone-faced "Chief of Gardens" who decides the Consul's fate at the Farolito. Or take the Farolito itself — "the lighthouse that invites the storm, and lights it!" — an emblem of salvation but also of isolation and the risk of foundering. Images of horses abound, like the "uncontrolled" horse with its blotto rider seen by Laruelle in Chapter 1, various equine descriptions of nature ("dark swift horses surging up the sky", "white horses westward marked where the real sea began"), Geoff's description of himself as "still strong as a horse", and of course (a horse, of course) the fateful, -branded horse encountered four times by different characters. We aren't told its colour, but white would make sense.

I have this book (the teal cover with the stylized skull on it) and never found the time to read it. Your review pushed it closer to the top of queue, thanks!
Glad to hear it! Plan to read it multiple times!