This paper presents, for the first time, a detailed study, from an archaeological perspective, of the morphological characteristics of the starch grains within the kernels of selected native wild grasses found in the Central Pampas of Argentina. We compared native wild grasses to maize starch grains, which can be distinguished from each other based on their size, shape and other attributes. The majority of the studied grains did not share morphological characteristics with maize starch grains. Considering this, it can be said that, if irregular and polyhedral grains with transverse or radial fissures dominate the starch assemblage, maize identification may be done on the basis of both morphology and size. Additionally, this research contributes to the characterization of the starch grains of the Panicoideae subfamily, which includes maize. Several classes of simple and compound starch grains are described and defined for native species of Pooideae, Chloridoideae, Arundinoideae, and Panicoideae subfamilies. The results obtained may constitute a baseline for the future determination of maize and wild grass use in archaeological contexts belonging to Middle/Late Holocene hunter-gatherers in the Pampas of Argentina and neighboring areas. Highlight: • Differentiation of maize starch from South American wild grasses by means of their morphology and size.
ResumenLos estudios sobre macro y microrrestos botánicos en contextos de cazadores-recolectoresde Pampa y Norpatagonia se han incrementado, al igual que el conocimiento del impacto de las plantas en la dieta de estas poblaciones. Con este propósito se han integrado diversos indicadores y técnicas analíticas. En algunos casos se registra el uso simultáneo de plantas silvestres y cultígenos. El marco temporal de uso de plantas domesticadas en la macroregión se ha desarrollado hasta ca. 2000 años a.P., mientras que la escala espacial se extiende entre el área cordillerana hasta las provincias fitogeográficas del monte y el espinal (34º a 40º S y 72º a 63º O aproximadamente). En este trabajo se presentan datos novedosos referidos a la presencia simultánea de maíz (Zea mays), cereales y leguminosas silvestres (Prosopis sp.y Poaceae) en contextos de cazadores-recolectores de la Pampa Occidental Argentina. Estos datos provienen del análisis de microfósiles en diferentes soportes: cerámica, artefactos de molienda y dientes humanos. Estos resultados permitieron conocer el rol que tuvieron las plantas para estas sociedades. A su vez, los datos fueron integrados, con investigaciones que focalizan el estudio de restos vegetales, tanto silvestres como domesticados, en una escala macroregional.
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