Porter P. Lowry

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Traditional classifications of Araliaceae have stressed a relatively small number of morphological characters in the circumscription of infrafamilial groups (usually recognized as tribes). These systems remain largely untested from a phylogenetic perspective, and only a single previous study has explicitly explored intergeneric relationships throughout this(More)
Few studies have attempted to quantify the reduction or document the floristic composition of forests in Madagascar. Thus, we focused specifically on deforestation and plant diversity in Madagascar's eastern littoral community. We used a data set of approximately 13,500 specimen records compiled from both historical and contemporary collections resulting(More)
1Department of Biodiversity and Conservation, Real Jardin Botanico, CSIC, Plaza de Murillo 2, ES-28014 Madrid, Spain 2Missouri Botanical Garden, P.O. Box 299, St. Louis, MO 63166-0299, U.S.A. 3Muséum National d’Histoire Naturelle, Case Postale 39, 57 rue Cuvier, FR-75231 05 CEDEX, Paris, France 4Department of Ecology and Evolution, Biophore, University of(More)
1. INTRODUCTION Madagascar's imperilled biota are now experiencing the effects of a new threat—climate change (Raxworthy et al. 2008). With more than 90% endemism among plants, mammals, reptiles and amphibians, the stakes are high. The pristine landscapes that allowed this exceptional biodiversity to survive past climate changes are largely gone.(More)
The island of Madagascar is a key hot spot for the genus Euphorbia, with at least 170 native species, almost all endemic. Threatened by habitat loss and illegal collection of wild plants, nearly all Malagasy Euphorbia are listed in CITES Appendices I and II. The absence of a reliable taxonomic revision makes it particularly difficult to identify these(More)
Patterns of adaptation in response to environmental variation are central to our understanding of biodiversity, but predictions of how and when broad-scale environmental conditions such as climate affect organismal form and function remain incomplete. Succulent plants have evolved in response to arid conditions repeatedly, with various plant organs such as(More)
This study shows that structural data, when carefully examined, can provide valuable characters for delimiting monophyletic groups and can complement DNA with observable features to recognize and circumscribe taxa. In the angiosperm order Apiales, traditional classification has relied heavily (often exclusively) on fruit characters. Recent molecular(More)
The relationship between the angiosperm families Apiaceae and Araliaceae (order Apiales) has been difficult to resolve, due in large part to problems associated with taxa characterized by a mixture of features typical of both families. Among such confounding groups are the araliads Delarbrea, Pseudosciadium, Myodocarpus, Mackinlaya, and Apiopetalum and many(More)
The world's large and rapidly growing human population is exhausting Earth's natural capital at ever-faster rates, and yet appears mostly oblivious to the fact that these resources are limited. This is dangerous for our well-being and perhaps for our survival, as documented by numerous studies over many years. Why are we not moving instead toward(More)
Forty-one endemic conifer species occur on New Caledonia’s ultramafic substrates (known locally as “terrains miniers”), the source of nickel ore deposits being exploited at a rapidly increasing rate. Impacts of the removal of native vegetation and its destruction by the deposition of mine wastes are compounded by fire, which has dramatically reduced and(More)