Sandra Knapp

Sandra Knapp
Natural History Museum, London · Department of Life Sciences

PhD

About

469
Publications
148,417
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
15,084
Citations
Additional affiliations
January 1992 - present
Natural History Museum, London
Position
  • Individual Merit Researcher
January 1981 - January 1986
Cornell University
Position
  • PhD Student
Description
  • I did my PhD with the late Michael D. Whalen at Cornell.

Publications

Publications (469)
Article
Full-text available
A new genus, Doselia A.Orejuela & Särkinen, gen. nov. , is described in the tribe Solandreae (Solanaceae) consisting of four species of hemiepiphytic lianas endemic to the premontane forests of the Colombian and Ecuadorian Andes. The genus is distinguished based on the membranous leaves, usually sparsely pubescent with eglandular simple trichomes,...
Article
Full-text available
Citation: Orejuela A, Villanueva B, Orozco CI, Knapp S, Särkinen T (2022) Monograph of Doselia (Solanaceae), a new hemiepiphytic genus endemic to the northern Andes. PhytoKeys 202: 73-96. https://doi. Abstract A new genus, Doselia A.Orejuela & Särkinen, gen. nov., is described in the tribe Solandreae (Solanaceae) consisting of four species of hemie...
Article
Full-text available
The Leptostemonum Clade, or the “spiny solanums”, is the most species-rich monophyletic clade of the large cosmopolitan genus Solanum (Solanaceae) and represents almost half the species diversity of the genus. Species diversity in the clade is highest in the Americas, but significant clusters of endemic taxa occur in the Eastern Hemisphere. We pres...
Article
This article is a Commentary on Muñoz‐Rodríguez et al. (2022), 234: 1185–1194.
Article
Full-text available
Premise of the study: Evolutionary studies require solid phylogenetic frameworks, but increased volumes of phylogenomic data have revealed incongruent topologies among gene trees in many organisms both between and within genomes. Some of these incongruences indicate polytomies that may remain impossible to resolve. Here we investigate the degree o...
Article
Full-text available
Two new species of Athenaea Sendtn. (Solanaceae) from the Brazilian Atlantic Forest are described and illustrated. Athenaea altoserranae I.M.C. Rodrigues & Stehmann, sp. nov. from the Serra do Mar range, in São Paulo State and Athenaea hunzikeriana I.M.C. Rodrigues & Stehmann, sp. nov. from a restricted area in the north-eastern region of Minas Ger...
Preprint
Full-text available
Premise of the study Evolutionary studies require solid phylogenetic frameworks, but increased volumes of phylogenomic data have revealed incongruent topologies among gene trees in many organisms both between and within genomes. Some of these incongruences indicate polytomies that may remain impossible to resolve. Here we investigate the degree of...
Article
Nicotiana section Suaveolentes is the largest section of Nicotiana and is a monophyletic group of allotetraploid species. Most of the species are endemic to Australia, but three species occur on islands in the South Pacific as far east as French Polynesia and one species is native to Namibia. Here, we present phylogenetic results based on genome sk...
Article
Explosive radiations – substantial increases in net species diversification – have been considered one of the most intriguing diversification patterns across the Tree of Life, but the subsequent change, movement and extinction of the constituent lineages makes radiations hard to discern or understand as geological time passes. We used the mega‐dive...
Article
Full-text available
Five new species of spiny solanums (Solanum subgenus Leptostemonum Bitter; the Leptostemonum Clade) are described from the islands of the Pacific. Two of the new species are from Fiji ( S. pseudopedunculatum D.McClelland, sp. nov . and S. ratale D.McClelland, sp. nov .), two from New Caledonia ( S. memoayanum D.McClelland, sp. nov. and S. semisuccu...
Article
Nicotiana section Suaveolentes is the largest section of Nicotiana and is a monophyletic group of allotetraploid species. Most of the species are endemic to Australia, but three species occur on islands in the South Pacific as far east as French Polynesia and one species is native to Namibia. Here, we present phylogenetic results based on genome sk...
Article
Athenaea Sendtn. nom. cons. is re‐established as the correct name for the taxon previously referred to as Aureliana Sendtn. (Withaninae, Solanaceae), which is a later homonym of Aureliana Boehm. (Araliaceae), and thus illegitimate. As a result, five new combinations transferring species from Aureliana Sendtn. to Athenaea are necessary and are made...
Article
Full-text available
Solanum L. (Solanaceae) is one of the largest genera of angiosperms and presents difficulties in identification due to lack of regional keys to all groups. Here we provide keys to all 135 species of Solanum native and naturalised in Africa (as defined by World Geographical Scheme for Recording Plant Distributions): continental Africa, Madagascar (i...
Article
Full-text available
People tend to see plants as the background to life on Earth, but they are essential to our very existence in many ways. In 1999 two botanist‐educators from the United States coined the term “plant blindness” to describe this condition, and to draw attention to the decreasing focus on plants in education. Here I argue that disregard for any organis...
Chapter
Solanum melongena L. (brinjal eggplant) is a member of a small monophyletic group (Eggplant clade) of mainly andromonoecious species in the large and diverse Leptostemonum clade of Solanum (previously referred to as subgenus Leptostemonum Bitter). The Leptostemonum clade (also known as the spiny solanums) is the most diverse monophyletic group in t...
Article
Full-text available
The Morelloid Clade, also known as the black nightshades or "Maurella" (Morella), is one of the 10 major clades within the mega-diverse genus Solanum L. The clade is most species rich in the central to southern Andes, but species occur around the tropics and subtropics, some extending well into the temperate zone. Plants of the group are herbaceous...
Article
Full-text available
Background Polyploidy has played a major role in angiosperm evolution. Previous studies have examined polyploid phenotypes in comparison to their extant progenitors, but not in context of predicted progenitor phenotypes at allopolyploid origin. In addition, differences in the trends of polyploid versus diploid evolution have not been investigated....
Article
Full-text available
Plants are crucial for human survival, providing nutrition, warmth, clothing, and shelter, as well as the air that we breathe. Plants also enhance our environment by making it more beautiful and thereby enriching our lives and increasing our wellbeing. We need to study plants more and better understand their biodiversity so that we can conserve and...
Article
Silverleaf nightshade (Solanum elaeagnifolium Cav.) is a drought tolerant invasive weed native to the New World. Despite its interest for common eggplant (S. melongena L.) breeding, up to now no success has been obtained in introgression breeding of eggplant with American Solanum species. Using an interspecific hybrid between common eggplant and S....
Data
These data base treats the Appendices I-VII of the International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code). It is online at: < https://naturalhistory2.si.edu/botany/codes-proposals/>
Article
Full-text available
Repetitive DNA has an important role in angiosperm genomes and is relevant to our understanding of genome size variation, polyploidisation and genome dynamics more broadly. Much recent work has harnessed the power of high-throughput sequencing (HTS) technologies to advance the study of repetitive DNA in flowering plants. Herbarium collections provi...
Article
Full-text available
Solanumcaatingaesp. nov. is described from the arid caatinga biome of north-eastern Brazil. It is known from only a few specimens, but these were found amongst the many sheets of the widespread circumtropical weed S.americanum Mill.; it is possible that more will be found once its distinct nature has been recognised. It differs from S.americanum an...
Data
Specimen data for species of the Morelloid Clade occurring in Brazil
Article
Full-text available
Premise of the Study While brinjal eggplant (Solanum melongena L.) is the second most important solanaceous fruit crop, we lack firm knowledge of its evolutionary relationships. This in turn limits efficient use of crop wild relatives in eggplant improvement. Here, we examine the hypothesis of linear step‐wise expansion of the eggplant group from A...
Article
Full-text available
The Morelloid clade, also known as the black nightshades or “Maurella” (Morella), is one of the 10 major clades within Solanum L. The pantropical clade consists of 75 currently recognised non-spiny herbaceous and suffrutescent species with simple or branched hairs with or without glandular tips, with a centre of distribution in the tropical Andes....
Preprint
Full-text available
Explosive radiations have been considered one of the most intriguing diversification patterns across the Tree of Life, but the subsequent change, movement and extinction of the constituent species makes radiations hard to discern or understand as geological time passes. We synthesised phylogenetic and distributional data for an ongoing radiation —...
Article
Premise of the study: Fossils provide minimum age estimates for extant lineages. Here we critically evaluate Cantisolanum daturoides Reid & Chandler and two other early putative seed fossils of Solanaceae, an economically important plant family in the Asteridae. Methods: Three earliest seed fossil taxa of Solanaceae from the London Clay Formatio...
Article
Full-text available
Change in floral shape is thought to be driven by pollinator-mediated selection, but drivers of floral shape evolution have been little studied at a macro-evolutionary scale. Smith and Kriebel (2018) examine floral shape across species within Iochrominae (Solanaceae) using geometric morphometrics and statistical regression analyses, and show signif...
Article
Full-text available
Solanum insanum L. (Solanaceaeae) is the wild progenitor of common eggplant (S. melongena L.) and is naturally distributed in south and southeast Asia, Madagascar and Mauritius. Despite interest in its potential for eggplant breeding it has not been studied extensively. Solanum insanum has been subjected to various taxonomic treatments, with severa...