Sierrudo

Sierrudo is the most contested name in the Agave karwinskii sub-variety complex, and the case study most often cited when explaining why agave local names cannot be flattened into a one-name, one-species mapping. The Bible's editorial position, consistent with the addendum's Part A.5 on the sierrudo placement controversy, is that the name is used for plants of more than one species depending on village and producer.

The case for placement outside A. karwinskii. The defensible reading of most commercial "sierrudo" bottlings is Agave americana (likely var. oaxacensis or an adjacent form), not karwinskii. Three pieces of morphological and life-history evidence weigh against karwinskii placement. First, reliable sierrudo bottlings consistently report 18 to 25 years to maturity, well above the 10 to 18 years typical of A. karwinskii. Second, the piñas of commercial sierrudo releases run 50 to 80 kg, four to ten times the size of a typical karwinskii piña. Third, some sierrudo populations are described as classic large-rosette A. americana plants without the woody trunk that defines the karwinskii complex. The Sacapalabras Mezcal Ancestral Sierrudo bottling (José Luis Sánchez "Shonga", Santa Catarina Minas) is marketed explicitly as Agave americana of 18 to 25 years.

The minority case for karwinskii placement. Local Oaxacan producers in San Juan del Río and Miahuatlán list sierrudo among karwinskii forms, and the leaf morphology of some sierrudo specimens is karwinskii-like. The Aragón-Parada et al. (2024) phenotypic survey of Central Valleys agaves found A. karwinskii to have the widest intra-population phenotypic variability of any species studied, which makes karwinskii-form sierrudo specimens plausible at the edges of the complex.

Editorial guidance. Treat any specific "sierrudo" bottle as needing producer-by-producer species attribution rather than a single class designation. The most defensible default for unmarked commercial sierrudo, in the absence of producer notes, is A. americana (var. oaxacensis or similar), with a minority of karwinskii-form usage persisting in specific village contexts. The botany chapter's karwinskii section walks the broader sub-variety controversy in which sierrudo sits.

Note on species cross-link: this entry resolves to A. salmiana as the closest authored species page; the underlying species attribution for most commercial sierrudo is A. americana, a Wave 2 species page not yet authored.