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Polygonum hidropiperoides (lagunilla) es una planta perenne de la familia Polygonaceae. Las especies del género Polygonum son cultivadas y comercializadas con fines medicinales y en el medio rural son usadas en los animales como cicatrizante. Se analizó la acción de los extractos de sus partes aéreas sobre componentes celulares y tisulares en heridas netas provocadas en ratones. Las lesiones provocadas fueron tratadas tópicamente durante 10 días con extractos diluidos de la especie nombrada obteniéndose muestras diarias para realizar estudios histológicos. En forma paralela, y para poder comparar la evolución de las heridas, se procedió en forma similar con ratones que no fueron tratados. Se observaron diferencias significativas en el arribo y presencia de neutrófilos y en la aparición de fibroblastos (prueba t de Student para dos muestras independientes). Entre otros cambios tisulares se destacó también el aumento de la vascularización.

Se estudió la composición de la dieta del pato mexicano (Anas diazi) y su variación en 2 periodos de otoño consecutivos (2004-2005) en el vaso sur de las ciénegas del Lerma, Estado de México, a partir de 24 muestras de patos cazados. El análisis complementario del peso seco agregado y la frecuencia mostraron que durante el otoño el pato mexicano tiene una dieta vegetariana en la que predominan las semillas de plantas acuáticas, malezas, maíz y tubérculos de Sagittaria y un mínimo consumo de invertebrados. Los alimentos que principalmente se consumieron en 2004 fueron semillas de Echinichloa holciformis, Polygonum lapathifolium y P. punctatum, en tanto que en la dieta de 2005, fueron semillas de maíz y tubérculos de Sagittaria macrophylla. El análisis de similitud de dietas de Sorensen, evidenció una variación de 70% entre los 2 años, lo cual puede atribuirse a la disponibilidad anual de alimento.The Mexican duck's diet composition and its variation in 2 consecutive fall periods (2004-2005) was studied at the Lerma marsh, South Basin, Mexico State, including 24 esophageal samples obtained during the hunting season. A complementary analysis using aggregated dry weight and frequency of occurrence showed than the Mexican duck has a vegetarian diet dominated by aquatic plants seeds, weeds seeds, corn seeds and Sagittaria tubes. The main foods in 2004 were Echinochloa holciformis, Polygonum lapathifolium and P. punctatum seeds, whereas corn seeds and Sagittaria macrophylla tubers dominated the 2005 diet. The Sorensen similarity analysis of the diets showed a diet variation of 70% on both years, which could be to attributed to annual food availability.

Rumex and Polygonum, of the family polygonaceae, occur in some abundance both in Colombia and in the United states, and this paper is an attempt to correlate a study of the Colombian plants with what has been observed in the United states. Through the courtesy of Dr. William R. Maxon, Curator, the facilities of the United states National Herbarium have been made available, and this work has been financed by the Wisconsin Alumni Research Foundation of Madison, Wisconsin. The writer's collections and field observations were made in Colombia from March to December, 1944, during such times as would not interfere with his work for the Colombian Cinchona Mission. Mr. E. P. Killip, Dr. F. R. Fosberg and Mr. Joseph Ewan have given me the benefit of their experience in South American botany to make a number of helpful suggestions.Rumex and Polygonum, of the family polygonaceae, occur in some abundance both in Colombia and in the United states, and this paper is an attempt to correlate a study of the Colombian plants with what has been observed in the United states. Through the courtesy of Dr. William R. Maxon, Curator, the facilities of the United states National Herbarium have been made available, and this work has been financed by the Wisconsin Alumni Research Foundation of Madison, Wisconsin. The writer's collections and field observations were made in Colombia from March to December, 1944, during such times as would not interfere with his work for the Colombian Cinchona Mission. Mr. E. P. Killip, Dr. F. R. Fosberg and Mr. Joseph Ewan have given me the benefit of their experience in South American botany to make a number of helpful suggestions.

[it] Viene Qui proposto un nuovo inquadramento tassonomico di Polygonum romanum Jacq., con il riconoscimento di tre taxa sottospecifici: Polygonum romanum Jacq. subsp. romanum dell' Italia centro-meridionale, P. romanum Jacq. subsp. gallicum (Raffaelli) Raffaelli & Villar, comb. & stat. nov., della Francia meridionale (Linguadoca) e P. romanum Jacq. subsp. balearicum Raffaelli & Villar, subsp. nov., dell' isola di Maiorca (Baleari, Spagna).