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The complex Myriopteris lendigera is composed of three species, M. lendigera, M. marsupianthes and M. mexicana, which are characterized by a high degree of morphological variation, making it a complex task to establish clear boundaries between these taxa. The objective of this study was to analyze the morphological and anatomical characteristics of this complex in order to define its taxonomic status...
Selenicereus tricae is a poorly known species from Belize, Guatemala, and Mexico. We present a morphological and anatomical description of this plant and provide data on its habitat and geographical distribution. In addition, we discuss its taxonomic affinities with S. inermis, S. wercklei, and S. rubineus, its hypothetical closest relatives. Selenicereus tricae has already been combined with S. inermis...
We studied floral morphology and anatomy of seven genera of the tribe Hamelieae sensu Manns & Bremer with the goal to evaluate the potential of these characters in the circumscription of the tribe. Twenty two species of Hamelieae were studied as well as ten representative species of the Cinchonoideae, Ixoroideae, and Rubioideae subfamilies for comparative purposes. The Hamelieae members had stamens...
Echinocereus section Triglochidiati has been accepted in the most recent taxonomic treatments of the genus. However, the number of included species has varied from one to 14. This study aims to define the species number of section Triglochidiati in Mexico through multivariate analysis, and to identify quantitative characters that can be used to recognize them. We used canonical discriminant analysis...
We describe the domatia of nine species of the genus Mortoniodendron, based on observations of cleared leaves and scanning electron micrographs. We recognize four kinds of domatia in Mortoniodendron species: cryptpocket, crypt, pocket and tufts of hairs, mostly associated with primary, secondary and tertiary veins. Mortoniodendron anisophyllum and M. costaricense have domatia up to the tertiary and...
A comparative study of leaf architecture and anatomy of 42 species of Bernardia and other genera related of Acalyphoideae was undertaken to identify characters that support infrageneric and specific delimitation. Thirty variable foliar architectural and anatomical characters were studied. Some characters are consistent (e.g., venation pattern, secondary and tertiary vein arrangement, presence or absence...
Resumen El géneroPachycereus incluye 13 especies de acuerdo con las clasificaciones más recientes, y se distribuye en Guatemala, México y SW de los Estados Unidos, Se presenta un análisis filogenético con el propósito de fundamentar la monofilia del género, respecto a los otros géneros de la subtribu Pachycereinae. Se creó una matriz utilizando 44 caracteres estructurales (morfología y anatomía) y...
Stenocereus zopilotensis Arreola-Nava and Terrazas, a new species from the Zopilote Canyon, municipality of Zumpango del Rio in the center of the state of Guerrero (Mexico), is described and illustrated. This new species is compared toStenocereus quevedonis J. G. Ortega,S. fricii Sánchez-Mej., andS. pruinosus (Otto) Buxb. based on morphological similarity. Moreover, the new species grows sympatrically...
A wood anatomical study of the Mexican species ofTapirira was undertaken to uncover evidence to help clarify the systematics of the genus. Three to five individuals of each of 10 populations from throughout the range of the genus in Mexico were studied. For comparative purposes, three Central and South American species were also examined. Cluster analysis showed that the genus in Mexico can be separated...
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