Anatomical Markers for Identification and Standardization of Crataegus mexicana, Commercially Marketed as "Raíz de...

"Tejocote, manzanita, tejocotera", and Mexican hawthorn are the popular common and commercial names of Crataegus mexicana Moc. & Sessé ex DC. This medicinal and edible plant species is widely used for weight loss and for treatment of cardiovascular, inflammatory, neurological, and respiratory infections. Several commercial products are marketed as "Raíz de Tejocote" for weight loss; however, these are frequently adulterated with other plants, other Crataegus species, or other parts of genuine C. mexicana. In this sense, this work aims to provide the anatomical features of the leaf and stem, and especially to authenticate the root of C. mexicana.

The study utilized light microscopy, fluorescence microscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy to identify the key characteristics that differentiate the market sample sold under the name Raíz de Tejocote.

Anatomical features revealed that the sample sold as Raiz de Tejocote is not a root but a stem. The absence of key diagnostic features such as cork, cortex, cambial layers, and sclereids in the cortex, and the presence of pith, uniseriate rays, radial vessel patterns, and clustered pits, strongly suggests that the market sample is adulterated, most likely derived from a stem of a Crataegus species, but not the C. mexicana.

The anatomical comparison indicates that the market sample does not match the root or stem characters of C. mexicana. This comparative anatomical profiling can serve as a reliable authentication parameter, especially if the sample is taken for quality check as a whole, cut and sifted, or coarse powder form, based on the wood characteristics, xylem vessel and fiber characteristics provided.