Thesis (M.S. in environmental science)--Washington State University, August 2009. / Title from PDF title page (viewed on Aug. 7, 2009). "School of Earth and Environmental Sciences." Includes bibliographical references.

En la provincia de Huaylas se presenta una gran diversidad de ecosistemas andinos en los que la familia Brassicaceae es una de las más representativas familias de plantas. Para determinar y caracterizar tal diversidad, se realizó un estudio taxonómico y de distribución de la familia Brassicaceae en la provincia de Huaylas, departamento de Ancash. Las especies fueron colectadas y procesadas siguiendo métodos estándares. Las determinaciones se realizaron utilizando claves taxonómicas y a través de la consulta y comparación con el material disponible en el Herbario San Marcos (USM). Se estableció la distribución geográfica y los rangos de distribución altitudinal para cada una de las especies a través del mapeo de las localidades de colecta sobre mapas base de la provincia de Huaylas. Se encontró un total de 12 géneros y 25 especies en la provincia de Huaylas, de las cuales, ocho constituyen adiciones a las especies de la familia Brassicaceae previamente reportadas para el departamento de Ancash como Descurainia depressa, Draba alyssoides y Sisymbrium peruvianum. De las 25 especies presentes en Huaylas, 18 se encontraron tanto en la Cordillera Negra como en la Cordillera Blanca, 6 sólo en la Cordillera Negra y 1 sólo en la Cordillera Blanca. En Huaylas no se encontró ninguna de las especies reportadas como endémicas para Ancash. Se encontraron diferencias entre los rangos altitudinales de los géneros, y entre especies de un mismo género. El 44% de las especies fueron colectadas exclusivamente por encima de los 3500 msnm. Se incrementó en aproximadamente el doble el número de especies reportadas para Huaylas. / --- In the Huaylas province there is a great diversity of andean ecosystems in which the Brassicaceae family is one of the most representative plant families. In order to determine and characterize such diversity, a taxonomic and distributional study of the Brassicaceae family was carried out in the Huaylas province, Ancash department. The species were collected and processed following standard methods. The determinations were done using taxonomic keys and through the consult and comparison of the material available in the San Marcos Herbarium (USM). The geographic distribution and the altitudinal ranges were established for each one of the species through the mapping of the collect localities over base maps of Huaylas province. A total of 12 genera and 25 species were found in the Huaylas province, from which 8 are additions to the species of the Brassicaceae family previously reported for the Ancash department like Descurainia depressa, Draba alyssoides and Sisymbrium peruvianum. Of the 25 species presented in the Huaylas province, 18 were found in both the Cordillera Negra and the Cordillera Blanca, 6 only in the Cordillera Negra and 1 only in the Cordillera Blanca. Any of the species reported as endemic for Ancash was found in the Huaylas province. Differences among the altitudinal ranges of the genera and species of the same genera were found. 44% of the species were collected exclusively over 3500 m above the sea level. The number of species reported for Huaylas was increased in near the double.

En la provincia de Huaylas se presenta una gran diversidad de ecosistemas andinos en los que la familia Brassicaceae es una de las más representativas familias de plantas. Para determinar y caracterizar tal diversidad, se realizó un estudio taxonómico y de distribución de la familia Brassicaceae en la provincia de Huaylas, departamento de Ancash. Las especies fueron colectadas y procesadas siguiendo métodos estándares. Las determinaciones se realizaron utilizando claves taxonómicas y a través de la consulta y comparación con el material disponible en el Herbario San Marcos (USM). Se estableció la distribución geográfica y los rangos de distribución altitudinal para cada una de las especies a través del mapeo de las localidades de colecta sobre mapas base de la provincia de Huaylas. Se encontró un total de 12 géneros y 25 especies en la provincia de Huaylas, de las cuales, ocho constituyen adiciones a las especies de la familia Brassicaceae previamente reportadas para el departamento de Ancash como Descurainia depressa, Draba alyssoides y Sisymbrium peruvianum. De las 25 especies presentes en Huaylas, 18 se encontraron tanto en la Cordillera Negra como en la Cordillera Blanca, 6 sólo en la Cordillera Negra y 1 sólo en la Cordillera Blanca. En Huaylas no se encontró ninguna de las especies reportadas como endémicas para Ancash. Se encontraron diferencias entre los rangos altitudinales de los géneros, y entre especies de un mismo género. El 44% de las especies fueron colectadas exclusivamente por encima de los 3500 msnm. Se incrementó en aproximadamente el doble el número de especies reportadas para Huaylas. / In the Huaylas province there is a great diversity of andean ecosystems in which the Brassicaceae family is one of the most representative plant families. In order to determine and characterize such diversity, a taxonomic and distributional study of the Brassicaceae family was carried out in the Huaylas province, Ancash department. The species were collected and processed following standard methods. The determinations were done using taxonomic keys and through the consult and comparison of the material available in the San Marcos Herbarium (USM). The geographic distribution and the altitudinal ranges were established for each one of the species through the mapping of the collect localities over base maps of Huaylas province. A total of 12 genera and 25 species were found in the Huaylas province, from which 8 are additions to the species of the Brassicaceae family previously reported for the Ancash department like Descurainia depressa, Draba alyssoides and Sisymbrium peruvianum. Of the 25 species presented in the Huaylas province, 18 were found in both the Cordillera Negra and the Cordillera Blanca, 6 only in the Cordillera Negra and 1 only in the Cordillera Blanca. Any of the species reported as endemic for Ancash was found in the Huaylas province. Differences among the altitudinal ranges of the genera and species of the same genera were found. 44% of the species were collected exclusively over 3500 m above the sea level. The number of species reported for Huaylas was increased in near the double.

Thesis (M. S. in Environmental Engineering)--Vanderbilt University, Dec. 2008. / Title from title screen. Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1942. / Typescript. Includes abstract and vita. eContent provider-neutral record in process. Description based on print version record. Bibliography: leaves 47-49.

Thesis (MSc)--Stellenbosch University, 2002. / ENGLISH ABSTRACT:Several authors regard the subdivision of the large genus Heliophila as unsatisfactory and in need of a detailed taxonomic study. Previous studies on this genus were based exclusively on gross external morphological characters. The present study investigates patterns of variation in Heliophila in order to identify taxonomically informative characters that could be used in the subdivision of this large genus. The study differs from previous studies in Heliophila because, in addition to macro-morphology, it employs micro- morphological (SEM) and palynological evidence to elucidate the subdivisio.n of Heliophila. The study emanates from a taxonomic revision of Heliophila proposed by Sander (1860), in which he subdivided the genus into six sections, based on the variation in fruit characters. Subsequent authors ignored the sections, regarding the generic subdivision as insufficiently supported, hence unsatisfactory . The results of cluster analysis, which are based on all the characters examined in the study (overall variation), propose the subdivision of Heliophila into three main clades: Micromorphological characters of fruits, seeds, and leaves are consistently found to be more congruent with the phenogram than macro-morphological characters of the same organs. This suggests that micro-morphological characters are taxonomically informative in Heliophila and should prove very important in a future phylogenetic classification of the genus. Palynological characters were found to be of limited taxonomic importance in the subdivision of the genus. / AFRIKAANSE OPSOMMING: Verskeie outeurs beskou die onderverdeling van die groot genus Heliophila as onbevredigend, en meen dat dit 'n gedetaileerde taksonomies studie benodig. Vorige studies op hierdie genus het slegs op ekstern morfologiese kenmerke gekonsentreer. In die huidige studie word patrone van variasie in Heliophila ondersoek met die oog op 'n moontlike onderverdeling van die genus, en taksonomies betek~nisvolle kenmerke wat in hierdie verband gebruik kan word, word geidentifiseer. Die huidige stud'e verskil van vorige studies daarin dat, benewens makro-morfologiese kenmerke, dit ook mikro-~rfologiese tegnieke (SEM) en palinologiese kenmerke gebruik om 'n sinvolle subverdeling van Heliophila te probeer vind. Die huidige studie spruit uit 'n taksonomiese hersiening van Heliophila deur Sonder (1860), waarin hy voorstel dat die genus in ses seksies verdeel word op grond van variasie in vrug kenmerke. Hierdie generiese onderverdeling en die voorgestelde seksies is deur latere outeurs as onbevredigend beskou, en is meestal in die literatuur geignoreer. Die resultate van fenetiese analise, wat op alle ingeslote kenmerke gebaseer is (algehele variasie), stel voor dat Heliophila in drie hoof groepe verdeel moet word. Taksonomies belangrike kenmerke wat hierdie onderverdeling ondersteun sluit in blaartipe, variasie in blaar-oppervlakke (SEM), variasie in die aard van die saadhuid (SEM) en variasie in vrugoppervlakke (SEM). Palinologiese en makro-morfologiese kenmerke was van geringe waarde in die onderverdeling van die genus.

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