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List of works by Steven D. Johnson

A key role for floral scent in a wasp-pollination system in Eucomis (Hyacinthaceae).

scientific article published on 30 December 2008

A molecular phylogeny reveals paraphyly of the large genus Eulophia (Orchidaceae): A case for the reinstatement of Orthochilus

scientific article (publication date: February 2014)

A pollinator shift explains floral divergence in an orchid species complex in South Africa

scientific article

A reassessment of Angraecopsis, Mystacidium and Sphyrarhynchus (Orchidaceae: Vandeae) based on molecular and morphological evidence

scientific article published in 2017

A reassessment of the phylogeny and circumscription of Zaluzianskya (Scrophulariaceae).

scientific article

A temporal dimension to the influence of pollen rewards on bee behaviour and fecundity in Aloe tenuior

scientific article

Adaptive plasticity of floral display size in animal-pollinated plants.

scientific article published in December 2005

Advances in the pollination biology of South African plants

article

Ancestral deceit and labile evolution of nectar production in the African orchid genusDisa ⬇️

scientific article published on July 31, 2013

Ancient divergence and contrasting floral biology of the two species of Pachites (Orchidaceae)

scientific article published in 2017

Anther cap retention prevents self-pollination by elaterid beetles in the South African orchid Eulophia foliosa

scientific article

Beetle pollination of the fruit‐scented cones of the South African cycad Stangeria eriopus ⬇️

scientific article published on August 19, 2009

Beyond pollen:ovule ratios: Evolutionary consequences of pollinator dependence and pollination efficiency for pollen and ovule production in angiosperms

scientific article published in 2023

Breeding systems in Cyrtanthus (Amaryllidaceae): variation in self-sterility and potential for ovule discounting

scientific article published on 06 August 2019

Breeding systems of floral colour forms in the <i>Drosera cistiflora</i> species complex

scientific article published in 2020

Breeding systems of invasive alien plants in South Africa: does Baker's rule apply?

article

Carrion flowers.

scientific article

Carrion mimicry in a South African orchid: flowers attract a narrow subset of the fly assemblage on animal carcasses

scientific article

Ceropegia sandersonii Mimics Attacked Honeybees to Attract Kleptoparasitic Flies for Pollination.

scientific article

Chemical and morphological filters in a specialized floral mimicry system

scientific article

Chemical mimicry of insect oviposition sites: a global analysis of convergence in angiosperms

scientific article published on 10 July 2013

Coloured nectar: distribution, ecology, and evolution of an enigmatic floral trait

scientific article

Complex floral morphology and scent chemistry mediate hawkmoth pollination of an African orchid in the diverse <i>Habenaria</i> clade

scientific article published in 2024

Consumptive emasculation: the ecological and evolutionary consequences of pollen theft

scientific article published on May 2009

Covariation of flower traits and bird pollinator assemblages among populations of Kniphofia linearifolia (Asphodelaceae)

scientific article published in 2011

Dark, bitter-tasting nectar functions as a filter of flower visitors in a bird-pollinated plant.

scientific article published in November 2006

Darwin's beautiful contrivances: evolutionary and functional evidence for floral adaptation

scientific article published on 22 June 2009

Description of a new species within the Satyrium longicauda (Orchidaceae) complex from South Africa, based on integrative taxonomy

scientific article published in 2022

Diacetin, a reliable cue and private communication channel in a specialized pollination system

scientific article

Directed vertebrate‐mediated seed dispersal of a fleshy‐fruited amaryllid in a heterogenous habitat

scientific article published in 2023

Dissecting the plant-insect diversity relationship in the Cape.

scientific article

Diverse pollination systems of the twin-spurred orchid genus Satyrium in African grasslands

article by Steven D. Johnson et al published 26 January 2011 in Plant Systematics and Evolution

Do floral syndromes predict specialization in plant pollination systems? An experimental test in an "ornithophilous" African Protea.

scientific article published on 28 May 2004

Do pollinator distributions underlie the evolution of pollination ecotypes in the Cape shrub Erica plukenetii?

scientific article

Does Specialized Pollination Impede Plant Invasions?

article

Does acoustic priming 'sweeten the pot' of floral nectar?

scientific article published on 23 June 2020

Doing the twist: A test of Darwin's cross-pollination hypothesis for pollinarium reconfiguration.

scientific article

Dung mimicry: the function of volatile emissions and corolla patterning in fly‐pollinated <i>Wurmbea</i> flowers

scientific article published in 2020

Effects of distance from models on the fitness of floral mimics.

scientific article

Effects of pollen reward removal on fecundity in a self-incompatible hermaphrodite plant.

scientific article published on 11 February 2011

Effects of self-compatibility on the distribution range of invasive European plants in North America.

scientific article published in December 2007

Effects of volatile compounds emitted by Protea species (Proteaceae) on antennal electrophysiological responses and attraction of cetoniine beetles.

scientific article

Emasculation increases seed set in the bird-pollinated hermaphrodite Kniphofia linearifolia (Xanthorrhoeaceae): evidence for sexual conflict?

scientific article

Evidence for pollination ecotypes in the African cycad <i>Encephalartos ghellinckii</i> (Zamiaceae)

scientific article published on 27 July 2020

Evidence for widespread pollen limitation of fruiting success in Cape wildflowers.

scientific article

Evolution and coexistence of pollination ecotypes in an African Gladiolus (Iridaceae).

scientific article published on 5 November 2009

Evolutionary and ecological insights from <i>Cytinus</i>: A plant within a plant

scientific article published in 2023

Evolutionary associations between nectar properties and specificity in bird pollination systems

scientific article

Exploitation of a specialized mutualism by a deceptive orchid.

scientific article published in August 2005

Faecal mimicry by seeds ensures dispersal by dung beetles.

scientific article published on 5 October 2015

Floral Mimicry Enhances Pollen Export: The Evolution of Pollination by Sexual Deceit Outside of the Orchidaceae ⬇️

scientific article published on November 1, 2010

Floral evolution as a figment of the imagination of pollinators

scientific article published on 21 April 2010

Floral scent in bird- and beetle-pollinated Protea species (Proteaceae): chemistry, emission rates and function.

scientific article published on 21 September 2012

Floral signposts: testing the significance of visual 'nectar guides' for pollinator behaviour and plant fitness.

scientific article published on 27 July 2011

Floral trait evolution associated with shifts between insect and wind pollination in the dioecious genus Leucadendron (Proteaceae).

scientific article published on 23 November 2015

Floral traits mediate the vulnerability of aloes to pollen theft and inefficient pollination by bees.

scientific article published on 25 January 2012

Flower colour adaptation in a mimetic orchid

scientific article published in February 2012

Flower orientation and corolla length as reproductive barriers in the pollinator‐driven divergence of <i>Erica shannonea</i> and <i>Erica ampullacea</i>

scientific article published in 2023

Flower orientation in Gloriosa superba (Colchicaceae) promotes cross-pollination via butterfly wings

scientific article published on 19 March 2020

Flowers as a reservoir of yeast diversity: description of Wickerhamiella nectarea f.a. sp. nov., and Wickerhamiella natalensis f.a. sp. nov. from South African flowers and pollinators, and transfer of related Candida species to the genus Wickerhamie

scientific article

Fly Pollination of Kettle Trap Flowers of Riocreuxia torulosa (Ceropegieae-Anisotominae): A Generalized System of Floral Deception

scientific article published on 30 July 2021

Fly pollination of Gorteria diffusa (Asteraceae), and a possible mimetic function for dark spots on the capitulum

scientific article published on April 1, 1997

Food Reward Chemistry Explains a Novel Pollinator Shift and Vestigialization of Long Floral Spurs in an Orchid

scientific article published on 30 October 2020

For the birds? Contrasting pollination and breeding systems of the paintbrush lilies Scadoxus puniceus and S. membranaceus (Amaryllidaceae) ⬇️

scholarly article published in 2021

Fruiting failure and limited recruitment in remnant populations of the hawkmoth-pollinated tree Oxyanthus pyriformis subsp. pyriformis (Rubiaceae)

Gastrodia madagascariensis (Gastrodieae, Orchidaceae): from an historical designation to a description of a new species from Madagascar

scientific article

Gender Differences in the Effects of Floral Spur Length Manipulation on Fitness in a Hermaphrodite Orchid

scientific article published in 2010

Generalised pollination systems for three invasive milkweeds in Australia ⬇️

scientific article published on November 22, 2012

Generalist birds outperform specialist sunbirds as pollinators of an African Aloe

scientific article published on 31 July 2019

Generalized food deception: colour signals and efficient pollen transfer in bee-pollinated species ofEulophia(Orchidaceae)

article

Geographical covariation and local convergence of flower depth in a guild of fly-pollinated plants.

scientific article

Geographical matching of volatile signals and pollinator olfactory responses in a cycad brood-site mutualism.

scientific article published in October 2015

Geographical variation in cone volatiles and pollinators in the thermogenic African cycad Encephalartos ghellinckii Lem.

scientific article published on 27 December 2017

Habitat dependent pollination success in a Cape orchid

article

Hawkmoth pollination of aerangoid orchids in Kenya, with special reference to nectar sugar concentration gradients in the floral spurs.

scientific article

Heteromorphic incompatibility and efficiency of pollination in two distylous Pentanisia species (Rubiaceae).

scientific article

High levels of fecundity in small and isolated populations of a self-compatible Aloe pollinated by opportunistic birds and bees

scientific article published on 17 April 2018

Hybridization and gene flow between a day- and night-flowering species of Zaluzianskya (Scrophulariaceae s.s., tribe Manuleeae)

scientific article published on 01 September 2004

Incomplete resupination during floral development leads to pollination failure in a slipper orchid

scientific article published in 2023

Interactions between hawkmoths and flowering plants in East Africa: polyphagy and evolutionary specialization in an ecological context

article

Interactions between the invasive treeMelia azedarach(Meliaceae) and native frugivores in South Africa

scientific article

Is biodiversity underestimated by classical herbarium-based taxonomy? A multi-disciplinary case study in Satyrium (Orchidaceae)

scientific article published in 2020

Is the timing of scent emission correlated with insect visitor activity and pollination in long-spurred Satyrium species?

scientific article

Key long-proboscid fly pollinator overlooked: morphological and molecular analyses reveal a new Prosoeca (Nemestrinidae) species ⬇️

article by Genevieve L Theron et al published 8 August 2020 in Biological Journal of the Linnean Society

Lack of floral constancy by bee fly pollinators: implications for ethological isolation in an African daisy

article by Allan G. Ellis & Steven D. Johnson published 23 February 2012 in Behavioral Ecology

Lack of floral nectar reduces self-pollination in a fly-pollinated orchid.

scientific article published on 27 September 2005

Macroevolutionary data suggest a role for reinforcement in pollination system shifts

scientific article

Male interference with pollination efficiency in a hermaphroditic orchid

scientific article published on 6 May 2014

Mammal pollinators lured by the scent of a parasitic plant.

scientific article published on 5 January 2011

Mechanisms and evolution of deceptive pollination in orchids.

scientific article

Metschnikowia drakensbergensis sp. nov. and Metschnikowia caudata sp. nov., endemic yeasts associated with Protea flowers in South Africa.

scientific article

Metschnikowia proteae sp. nov., a nectarivorous insect-associated yeast species from Africa.

scientific article

Mimics and magnets: the importance of color and ecological facilitation in floral deception.

scientific article published in June 2008

Native honeybees as flower visitors and pollinators in wild plant communities in a biodiversity hotspot

scientific article

Native pollen thieves reduce the reproductive success of a hermaphroditic plant, Aloe maculata

scientific article

Nectar cardenolides and floral volatiles mediate a specialized wasp pollination system

scientific article published in 2024

Niche Perspectives on Plant-Pollinator Interactions

scientific article published on 05 May 2020

Novel Consequences of Bird Pollination for Plant Mating.

scientific article published on 12 April 2017

POLLINATION SUCCESS IN A DECEPTIVE ORCHID IS ENHANCED BY CO-OCCURRING REWARDING MAGNET PLANTS

scientific article published on 04 June 2007

Palp-faction: an African milkweed dismembers its wasp pollinators.

scientific article published in June 2009

Patterns of odour emission, thermogenesis and pollinator activity in cones of an African cycad: what mechanisms apply?

scientific article

Patterns of plant speciation in the Cape floristic region.

scientific article

Phylogenetic evidence for pollinator-driven diversification of angiosperms.

scientific article published on 23 March 2012

Phylogenetically independent associations between autonomous self-fertilization and plant invasiveness.

scientific article published in February 2008

Phylogeny and radiation of pollination systems in Disa (Orchidaceae) ⬇️

scientific article published on March 1, 1998

Pollen transfer efficiency in Erica depends on type of pollinator

scientific article published in 2024

Pollination and breeding system of the enigmatic South African parasitic plant Mystropetalon thomii (Mystropetalaceae): rodents welcome, but not needed.

scientific article

Pollination and late-acting self-incompatibility in Cyrtanthus breviflorus (Amaryllidaceae): implications for seed production.

scientific article

Pollination efficiency and the evolution of specialized deceptive pollination systems.

scientific article published on January 2010

Pollination failure in Tritoniopsis parviflora (Iridaceae): New insights into the ecology and anatomy of this oil- and nectar-producing species

scientific article published in 2023

Pollination function transferred: modified tepals of Albuca (Hyacinthaceae) serve as secondary stigmas.

scientific article

Pollination of <i>Chamaepentas nobilis</i> (Rubiaceae) by long‐proboscid hawkmoths in south‐central Africa: Trait mismatching and floral scent chemistry

scientific article published in 2024

Pollination, Adaptation and Speciation Models in the Cape Flora of South Africa

scientific article (publication date: February 1996)

Pollinator behaviour and plant speciation: can assortative mating and disruptive selection maintain distinct floral morphs in sympatry?

article

Pollinator-driven ecological speciation in plants: new evidence and future perspectives.

scientific article published on January 2014

Pollinator-mediated evolution of floral signals ⬇️

scientific article published on 05 March 2013

Pollinator-mediated selection on flower-tube length in a hawkmoth-pollinated Gladiolus (Iridaceae).

scientific article published in March 2002

Pollinators, "mustard oil" volatiles, and fruit production in flowers of the dioecious tree Drypetes natalensis (Putranjivaceae).

scientific article published on 14 October 2009

Pollinators, mates and Allee effects: the importance of self-pollination for fecundity in an invasive lily

scientific article published in 2013

Reconnecting plants and pollinators: challenges in the restoration of pollination mutualisms.

scientific article published on 25 October 2010

Relationships between population size and pollen fates in a moth-pollinated orchid

article by Steven D Johnson et al published 25 February 2009 in Biology Letters

Reproductive assurance through self-fertilization does not vary with population size in the alien invasive plant Datura stramonium

article

Reproductive biology of Acrolophia cochlearis (Orchidaceae): estimating rates of cross-pollination in epidendroid orchids.

scientific article

Reproductive isolation between Zaluzianskya species: the influence of volatiles and flower orientation on hawkmoth foraging choices.

scientific article published on 4 November 2015

Rodent responses to volatile compounds provide insights into the function of floral scent in mammal-pollinated plants

scientific article published on 2 May 2022

Rosenbergiella australoborealis sp. nov., Rosenbergiella collisarenosi sp. nov. and Rosenbergiella epipactidis sp. nov., three novel bacterial species isolated from floral nectar

scientific article

Saurian surprise: lizards pollinate South Africa's enigmatic hidden flower

scientific article published on 04 April 2019

Scent chemistry is key in the evolutionary transition between insect and mammal pollination in African pineapple lilies

scientific article published on 10 February 2019

Self-pollination and inbreeding depression in Acacia dealbata: Can selfing promote invasion in trees?

article by James G. Rodger et al published September 2013 in South African Journal of Botany

Shift from bird to butterfly pollination in Clivia (Amaryllidaceae).

scientific article published on 10 January 2014

Specialization for Tachinid Fly Pollination in the Phenologically Divergent Varieties of the Orchid Neotinea ustulata

scientific article published on 16 June 2021

Specialization for pollination by beetles and wasps: the role of lollipop hairs and fragrance in Satyrium microrrhynchum (Orchidaceae) ⬇️

scientific article published on January 1, 2007

Specialized mutualisms may constrain the geographical distribution of flowering plants

scientific article published in November 2017

Sugar Preferences of a Generalist Nonpasserine Flower Visitor, the African Speckled Mousebird (Colius striatus)

article by Mark Brown et al published October 2010 in The Auk

Testing for ecological and genetic Allee effects in the invasive shrub Senna didymobotrya (Fabaceae) ⬇️

scientific article published on July 1, 2005

The diversity and evolution of pollination systems in large plant clades: Apocynaceae as a case study

scientific article published on 01 January 2019

The economy of pollen dispersal in flowering plants

scientific article published in 2023

The effects of floral mimics and models on each others' fitness.

scientific article published in April 2006

The effects of nectar addition on pollen removal and geitonogamy in the non-rewarding orchid Anacamptis morio

scientific article published in April 2004

The evolution of floral mimicry: identifying traits that visually attract pollinators

article published in 2012

The evolution of floral nectaries in Disa (Orchidaceae: Disinae): recapitulation or diversifying innovation?

scientific article

The evolution of floral variation without pollinator shifts in Gorteria diffusa (Asteraceae) ⬇️

scientific article published on April 1, 2009

The geographical mosaic of coevolution in a plant-pollinator mutualism.

scientific article published on 6 December 2007

The long and the short of it: a global analysis of hawkmoth pollination niches and interaction networks.

scientific article published on 27 September 2016

The long-tongued hawkmoth pollinator niche for native and invasive plants in Africa ⬇️

scientific article published on 7 September 2015

The missing stink: sulphur compounds can mediate a shift between fly and wasp pollination systems.

scientific article published on 5 May 2010

The pollination ecology of an assemblage of grassland asclepiads in South Africa

scientific article

The pollination niche and its role in the diversification and maintenance of the southern African flora.

scientific article

The relative contributions of insect and bird pollinators to outcrossing in an African Protea (Proteaceae).

scientific article published on 5 June 2012

The role of plant–pollinator interactions in structuring nectar microbial communities

scientific article published on 09 June 2021

The spider orchid trapped in its molecular web: Phylogeny and morphological evolution of the orchid genera Bartholina and Holothrix (Orchidaceae: Orchidoideae)

scientific article

Three-dimensional geometric morphometrics for studying floral shape variation

scientific article published on 10 June 2010

Transfer of pollinaria on birds? feet: a new pollination system in orchids

scientific article published in 2004

Transition from wind pollination to insect pollination in sedges: experimental evidence and functional traits.

scientific article published on 17 May 2011

Using two confluent capillary columns for improved gas chromatography‐electroantennographic detection (GC‐EAD)

scientific article published in 2020

Variation in the chemical composition of cone volatiles within the African cycad genus Encephalartos.

scientific article

Wahlberg’s epauletted fruit bat (Epomophorus wahlbergi) as a potential dispersal agent for fleshy-fruited invasive alien plants: effects of handling behaviour on seed germination

article

When bigger is not better: intraspecific competition for pollination increases with population size in invasive milkweeds

scientific article

Why honeybees are poor pollinators of a mass‐flowering plant: Experimental support for the low pollen quality hypothesis

scientific article published in 2022

‘Bleeding’ flowers of <i>Ceropegia gerrardii</i> (Apocynaceae‐Asclepiadoideae) mimic wounded insects to attract kleptoparasitic fly pollinators

scientific article published in 2023

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