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Universidad Autónoma de San Luis Potosí (UASLP) 1998

Distribución geográfica y ecológica del género Ephera L. en el altiplano potosino

Méndez Mendoza, Celma

Titre : Distribución geográfica y ecológica del género Ephera L. en el altiplano potosino

Auteur : Méndez Mendoza, Celma

Etablissement de soutenance : Universidad Autónoma del Estado de San Luis Potosí (UASLP)

Grade : Maestría en Ciencias Agropecuarias 1998

Résumé
The genus Ephedra, commonly known as Monnon tea, has medicinal properties which are primarily related to the alkaloids, ephedrine and pseudoephedrine. In Mexico linlc is known about the species, of Ephedra particularly in tenns of this geographical and ecological distributions. This thesis has as its objectives to ; 1) define the geographic distribution of the genus on the high plateau of the southem Chihuahuan desert, and 2) detennine the ecological features where the genus occurs. The specimens deposited in the herbaria of several Mexican institutions, were used in order to obtain a preliminary understanding of the distribution of the five species found on the altiplano ol’ the southem Chihuahuan Desert and after, that botanical explorations were made in the field. Five species of Ephedra ; E. antisyphilitica, E. aspera, E. compacta, E. pedunculata y E. trifurca were found in the area a from 22° 02’, to 24° 13’ North latitude and from 100°15’ to 101 °45’ West longitude. The altitudinal distribution of Ephedra is from 1115 m, to 2850 m. The genus is occurs in the desert matorral zone

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