Species of flowering plant
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Magnolia pugana, commonly known as almacasusco, is a species of "Magnolia" from northern Jalisco and southern Zacatecas states in western Mexico.
Description.
"Magnolia pugana" is a medium-sized tree, growing 15 to 25 meters tall, with a trunk up to 40–80 cm in diameter.
Range and habitat.
"Magnolia pugana" is found in the valleys and canyons of the middle Río Grande de Santiago and lower reaches of the Juchipila and Verde rivers, and on the slopes of the neighboring Sierra de Morones and Sierra Fría ranges, in northern Jalisco and southern Zacatecas states. It occurs in mountainside cloud forests, and more commonly in humid ravines and riparian forests along permanent streams in dry deciduous forests, from 1,300 to 1,600 meters elevation.
It has a very restricted range, with an area of occupancy (AOO) of 114 km2 and an extent of occurrence of approximately 2,460 km2.
Conservation.
The species has a restricted range and is threatened by habitat loss from deforestation and conversion of its habitat to agriculture and urbanization. Its population is decreasing, and its conservation status is assessed as Endangered.
Systematics.
"Magnolia pugana" belongs to sect. "Magnolia". Other closely related species live in western Mexico and constitute the "Magnolia pacifica" group – "Magnolia pacifica" from the coast-facing mountains of Nayarit and western Jalisco, and "Magnolia vallartensis" from the Pacific lowlands around Puerto Vallarta. "M. pugana" and "M. vallartensis" are sometimes classed as subspecies of "M. pacifica".
Vázquez-García "et al." consider the eastern population of "M. pugana" from the Río Verde region in Zapotlanejo and Ixtlahuacán del Río municipalities north of Guadalajara, known as the Barrancae Group, to be separate species, "M. granbarrancae".
References.
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