B. Drew's research while affiliated with University of Nebraska at Kearney and other places
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Publications (163)
Distributed in Central Asia, Metastachydium (Lamiaceae) is a poorly understood and rare monotypic genus, with few collections known. The systematic position of this enigmatic genus within Lamiaceae has remained unresolved due to its poor representation in herbaria and coincident lack of available materials for molecular phylogenetic analysis. Facil...
Salvia (Lamiaceae) is a sub-cosmopolitan genus of about 1000 species that often employ a “staminal lever mechanism” that is thought to have spurred species diversification within the genus. The function and evolution of ventral outgrowths or connective teeth, associated with the lever mechanism in some species of Salvia, is often unclear despite th...
The article discusses the differences between the Monardella odoratissima and M. ovata species complexes. New combinations are presented to account for changes in taxonomy, three species are re-recognized and a new subspecies is described.
The genus Salvia is comprised of about 1000 species and has diversity hotspots in the Americas, East Asia, southwest Asia and the Mediterranean region. Central Asia also possesses considerable Salvia species diversity but is understudied relative to the aforementioned diversity hotspots. To help remedy this deficiency, we present a synopsis of Cent...
Winter annuals comprise a large fraction of warm-desert plant species, but the drivers of their diversity are little understood. One factor that has generally been overlooked is the lack of obvious means of long-distance seed dispersal in many desert-annual lineages, which could lead to genetic differentiation at small spatial scales and, ultimatel...
Lamiaceae are one of the largest and most economically important families of flowering plants. Despite focused study on relationships within subclades, higher-level relationships have been under-studied. Moreover, the herbaceous habit of much of the family has resulted in a poor fossil record and has hampered estimates of divergence times. Using a...
The northern temperate genus Dracocephalum consists of approximately 70 species mainly distributed in the steppe-desert biomes of Central and West Asia and the alpine region of the Qinghai-Tibetan Plateau (QTP). Previous work has shown that Dracocephalum is not monophyletic and might include Hyssopus and Lallemantia. This study attempts to clarify...
Winter annuals comprise a large fraction of warm-desert plant species, but the drivers of their diversity are little understood. One factor that has generally been overlooked is the lack of obvious means of long-distance seed dispersal in many desert-annual lineages, which could lead to genetic differentiation at small spatial scales and, ultimatel...
A fundamental question in evolutionary biology is how clades of organisms exert influence on one another. The evolution of the flower and subsequent plant/pollinator coevolution are major innovations that have operated in flowering plants to promote species radiations at a variety of taxonomic levels in the Neotropics. Here we test the hypothesis t...
To investigate the value of atypical foraging behavior of honey bees (Apis mellifera) during dearth, we compared the number of days survived in vitro among young adult honey bees kept in hoarding cages using various feeding strategies. Treatment groups were fed solid patty diets consisting of 100%, 67%, or 33% bee gathered corn grain dust, 100%, 67...
Paralamium (Lamiaceae) is a monotypic genus within the subfamily Lamioideae with a sporadic distribution in subtropical mountains of southeast Asia. Although recent studies have greatly improved our understanding of generic relationships within Lamioideae, the second most species-rich subfamily of Lamiaceae, the systematic position of Paralamium wi...
Background: A robust molecular phylogeny is fundamental for developing a stable classification and providing a solid framework to understand patterns of diversification, historical biogeography, and character evolution. As the sixth largest angiosperm family, Lamiaceae, or the mint family, consitutes a major source of aromatic oil, wood, ornamental...
Salvia L. is an ideal exemplar to demonstrate prezygotic isolation mechanisms in sympatric populations due to their wellknown staminal lever mechanism. Mechanical, phenological, and ethological isolation mechanisms have been reported among
sympatric species of Salvia. However, it has been shown that if closely related species are sympatric and flow...
Premise of research. Salvia grandifolia is a narrowly endemic species known only from the Hengduan Mountains of southwestern China. Previous studies have shown that East Asian Salvia species form a clade, Salvia subg. Glutinaria, and suggested that S. grandifolia, on the basis of geographical distribution, should be included within Glutinaria. Caly...
Switches in pollinators have been argued to be key drivers of floral evolution in angiosperms. However, few studies have tested the relationship between floral shape evolution and switches in pollination in large clades. In concert with a dated phylogeny, we present a morphometric analysis of corolla, anther connective, and style shape across 44% o...
Salvia rupestris (Lamiaceae), from the Caatinga region of Pernambuco State, Brazil, is described and illustrated. Photos of the specimen dissected in stereo microscope and a distribution map are provided. The new species is compared to S. fruticetorum, a morphologically allied species.
Premise of research. Previous studies based on plastid fragments and/or nuclear ribosomal DNA have had limited
success resolving relationships within the genus Salvia. This study evaluates the efficacy of complete plastome
sequences for phylogenetic inference within Salvia, using the recently established Salvia subg. Glutinaria as a case
study. We...
Scutellaria, or skullcaps, are medicinally important herbs in China, India, Japan, and elsewhere. Though Scutellaria is the second largest and one of the more taxonomically challenging genera within Lamiaceae, few molecular systematic studies have been undertaken within the genus; in part due to a paucity of available informative markers. The lack...
Monardella is a western North America genus ranging from the Rocky Mountains to the Pacific Ocean and from southern Canada to the southern tip of Baja California Sur. The levels of unrecognized and cryptic taxa within Monardella are similar to other taxonomically complicated western North American genera, such as Eriogonum (Polygonaceae), Penstemon...
Lepechinia is a New World genus of Lamiaceae with ca. 45 species. There is ongoing controversy regarding the recognition and delimitation of Lepechinia that occur in Brazil. After fieldwork and herbaria consultation we recognize two species of Lepechinia in Brazil: Lepechinia speciosa, distributed within the Mantiqueira region, and Lepechinia annae...
Premise of the study:
A key question in evolutionary biology is why some clades are more successful by being widespread geographically, biome diverse, or species-rich. To extend understanding of how shifts in area, biomes, and pollinators impact diversification in plants, we examined the relationships of these shifts to diversification across the...
PREMISE OF THE STUDY: We used spatial phylogenetics to analyze the assembly of the
Wisconsin flora, linking processes of dispersal and niche evolution to spatial patterns of
floristic and phylogenetic diversity and testing whether phylogenetic niche conservatism
can account for these patterns.
METHODS: We used digitized records and a new molecular...
Phylogenies recurrently demonstrate that oceanic island systems have been home to rapid clade diversification and adaptive radiations. The existence of adaptive radiations posits a central role of natural selection causing ecological divergence and speciation, and some plant radiations have been highlighted as paradigmatic examples of such radiatio...
Background and aims:
Salvia is the largest genus within Lamiaceae, with about 980 species currently recognized. East Asia, with approx. 100 species, is one of the three major biodiversity centres of Salvia. However, relationships within this lineage remain unclear, and the staminal lever mechanism, which may represent a key innovation within the g...
Ajugoideae, the third-largest subfamily of Lamiaceae with 23 genera and about 760 species, is distributed worldwide,
but is primarily found in tropical regions. During the past two decades, substantial progress has been made towards discerning
phylogenetic relationships and generic boundaries in Ajugoideae, but major questions still remain. This ph...
Menthinae (Lamiaceae) is the largest subtribe within tribe Mentheae, and includes about 40 genera and 1000 species. Menthinae are important economically as culinary herbs, including mints (Mentha), oregano (Origanium), savory (Satureja), and thyme (Thymus), and also as ornamental plants such as bee balm (Monarda). Three genera of Menthinae, Acantho...
Inferring interfamilial relationships within the eudicot order Ericales has remained one of the more recalcitrant problems in angiosperm phylogenetics, likely due to a rapid, ancient radiation. As a result, no comprehensive time-calibrated tree or biogeographical analysis of the order has been published. Here, we elucidate phylogenetic relationship...
Ajugoideae, the third-largest subfamily of Lamiaceae with 23 genera and about 760 species, is distributed worldwide, but is primarily found in tropical regions. During the past two decades, substantial progress has been made towards discerning phylogenetic relationships and generic boundaries in Ajugoideae, but major questions still remain. This ph...
Premise of the study:
The subtribe Menthinae (Lamiaceae), with 35 genera and 750 species, is among the largest and most economically important subtribes within the mint family. Most genera of Menthinae are found exclusively in the New World, where the group has a virtually continuous distribution ranging from temperate North America to southern So...
Phylogenetic trees are a crucial backbone for a wide breadth of biological research spanning systematics, organismal biology, ecology, and medicine. In 2015, the Open Tree of Life project published a first draft of a comprehensive tree of life, summarizing digitally available taxonomic and phylogenetic knowledge. This paper reviews, investigates, a...
Schima is an ecologically and economically important woody genus in tea family (Theaceae). Unresolved species delimitations and phylogenetic relationships within Schima limit our understanding of the genus and hinder utilization of the genus for economic purposes. In the present study, we conducted comparative analysis among the complete chloroplas...
Previous molecular phylogenetic research, based on chloroplast and nuclear ribosomal DNA data, has demonstrated that the large genus Salvia (Lamiaceae) is paraphyletic as traditionally circumscribed. However, neither relationships within Salvia s.l. nor within subtribe Salviinae have been evaluated using low-copy nuclear gene regions. Here, we use...
This study uses nuclear ribosomal ETS & ITS (nrDNA) regions to analyze relationships both within the Monardella and to other CFP Menthinae taxa, and represents an important step towards a thorough taxonomic revision of Monardella.
Aim: Across angiosperm families, the area occupied by a family is strongly correlated with its richness. We explore the causes of this area-richness correlation using the cosmopolitan family, Cyperaceae Juss., as a model. We test the hypothesis that, despite a proposed tropical origin, temperate lineages in the family diversified at elevated rates....
Ombrocharis is the only incertae sedis genus within Lamiaceae that has not been included in a published molecular phylogenetic study. Here, we adopt a two-step approach to resolve the phylogenetic placement of the genus. Initially, the subfamilial affiliation of Ombrocharis was determined based on a combined ndhF and rbcL dataset covering all seven...
The role of geography and ecology in speciation are often discussed in the context of phylogenetic niche conservatism (PNC), the propensity of lineages to retain ancestral niche related traits. However, a recent paradigm shift focuses instead on measuring divergence of these traits in conjunction with patterns of speciation. Under this framework, w...
Abstract— In the California Floristic Province (CA-FP) and nearby deserts, 19 species of Salvia (Lamiaceae, Mentheae) form a small radiation but an important component of the chaparral and desert communities. Traditionally, two groups within these Californian Salvia have been recognized (usually treated as sections), but relationships within each,...
Significance
Scientists have used gene sequences and morphological data to construct tens of thousands of evolutionary trees that describe the evolutionary history of animals, plants, and microbes. This study is the first, to our knowledge, to apply an efficient and automated process for assembling published trees into a complete tree of life. This...
Reconstructing the phylogenetic relationships that unite all lineages (the tree of life) is a grand challenge. The paucity of homologous character data across disparately related lineages currently renders direct phylogenetic inference untenable. To reconstruct a comprehensive tree of life we therefore synthesized published phylogenies, together wi...
Despite considerable progress, many details regarding the evolution of the Arcto-Tertiary flora, including the timing, direction, and relative importance of migration routes in the evolution of woody and herbaceous taxa of the Northern Hemisphere, remain poorly understood. Meehania (Lamiaceae) comprises seven species and five subspecies of annual o...
We present an updated circumscription of Lepechinia (Lamiaceae) based on molecular phylogenetic analyses of chloroplast, nuclear ribosomal, and low-copy nuclear genes. In particular, the relationships between Lepechinia mexicana, Neoeplingia leucophylloides, and
Chaunostoma mecistandrum, which range from central Mexico down to northern Central Amer...
Since the advent of molecular phylogenetics more than 25 years ago, a major goal of plant systematists has been to discern the root of the angiosperms. While most studies indicate that Amborella trichopoda is sister to all remaining extant flowering plants, support for this position has varied with respect to both the sequence data sets and analyse...
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Premise of the study:
Sparganium (Typhaceae) is a genus of aquatic monocots containing ±14 species, with flowers aggregated in unisexual, spherical heads, and habit ranging from floating to emergent. Sparganium presents an opportunity to investigate diversification, character evolution, and biogeographical relationships in a widesp...
Description of methods used for this study.
(DOC)
List of 74 specialized journals surveyed for seed plant phylogenies.
(DOC)
Quality survey from 344 publications that did have data publicly available on TreeBASE (see Text S1).
(TIF)
Corresponding author's response to emails (2) requesting alignments and trees from previously published study. Number in parenthesis subtending organismal group represents number of authors contacted.
(DOCX)
List of specialized journals (see definition in Text S1) examined here.
(DOCX)
List of nonspecialized, broad audience journals (see definition in Text S1) examined here.
(DOC)
Failure to archive published data can impede reproducibility and inhibit downstream synthesis. Alarmingly, we estimate that ∼70% of existing DNA sequence alignments/phylogenetic trees, representing much of the underpinning of modern phylogenetic analysis, are no longer accessible. The evolutionary biology community needs to adopt policies ensuring...
Premise of the study:
The mint family (Lamiaceae) is the sixth largest family of flowering plants, with the tribe Mentheae containing about a third of the species. We present a detailed perspective on the evolution of the tribe Mentheae based on a phylogenetic analysis of cpDNA and nrDNA that is the most comprehensive to date, a biogeographic set...
Lepechinia (Lamiaceae subf. Nepetoideae) is a New World genus composed of about 42 species distributed primarily from Northern California to Central Argentina. Previous morphological and molecular studies on Lepechinia have raised questions on the monophyly of the genus and its placement within the tribe Mentheae. In this paper the phylogenetic pla...
The evolution of the inflorescence head in Asteraceae is important in the diversification of this largest angiosperm family. The aggregation of heads into higher-order capitulescences (secondary heads or syncephalia) is considered evolutionarily advanced. The genera Moscharia, Nassauvia, Polyachyrus, and Triptilion of the subtribe Nassauviinae (Mut...