Ricardo Kriebel

Learn More
Orchids are the most diverse family of angiosperms, with over 25 000 species,more than mammals, birds and reptiles combined. Tests of hypotheses to account for such diversity have been stymied by the lack of a fully resolved broad-scale phylogeny. Here,we provide such a phylogeny, based on 75 chloroplast genes for 39 species representing all orchid(More)
We report observations of generalist insect visitation and probable pollination of the flowers of Miconia brevitheca and M. tonduzii var. tonduzii, both of which belong to Miconia section Cremanium. The most diverse assemblage of insect visitors was recorded for M. brevitheca, which has some of the smallest flowers in the Melastomataceae. Visitors included(More)
PREMISE OF THE STUDY The alternation of generations life cycle represents a key feature of land-plant evolution and has resulted in a diverse array of sporophyte forms and modifications in all groups of land plants. We test the hypothesis that evolution of sporangium (capsule) shape of the mosses-the second most diverse land-plant lineage-has been driven by(More)
Conostegia has been traditionally defined to consist of 42 species in the tribe Miconieae. Recent phylogenetic studies have cast doubt on the monophyly of the genus and highlighted the need for a phylogenetic study focused on Conostegia. The purpose of this study was to test the monophyly of Conostegia and address relationships in the genus. We addressed(More)
Department of Botany, University of Wisconsin-Madison, Madison, WI 53706, USA, Departamento de Biolog ıa, Universidad del Valle, Cali, Colombia, Centre for Australian National Biodiversity Research, Canberra, ACT 2601, Australia, Institute of Ecology and Biodiversity, Facultad de Ciencias, Universidad de Chile, Santiago, Chile, Department of Biology,(More)
A synopsis of the annual genus Poteranthera is presented here. Three species are recognized including the newly described Poteranthera windischii. Poteranthera is characterized by its annual life cycle, generally linear leaves that have conspicuous gland-tipped hairs on the lamina margin, 5-merous flowers with a constriction at the level of the torus, one(More)
The purpose of this study was to evaluate the procedures involved in forming high- and low-fusing solder joints between two different base metal alloys and to compare the strength of these joints with the strength of those formed between specimens made from a high-gold content alloy. The conclusions of this investigation can be summarized as follows. All(More)
The new species Blakea bocatorena is described from Bocas del Toro province in Panama. It is only the third species to be described in the genus that has foliaceous appendages on the sepals. The other two species with these sepal appendages are B. calycosa and B. tuberculata. Blakea bocatorena differs from the latter two species in that it has white petals(More)
We here propose and describe three new species of Clidemia: C. aguilarii from Costa Rica and Panama; C. aurantiaca from Costa Rica, Panama, and Ecuador; and C. subpeltata, a Costa Rican endemic. Phenological notes, distribution maps, line drawings, color images of the live plants in the wild, and discussions comparing the new species to their presumed(More)
We examine the eudicot order Myrtales, a clade with strong Gondwanan representation for most of its families. Although previous phylogenetic studies greatly improved our understanding of intergeneric and interspecific relationships within the order, our understanding of inter-familial relationships still remains unresolved; hence, we also lack a robust(More)