Pieter B Pelser

Pieter B Pelser
University of Canterbury | UC · School of Biological Sciences

PhD

About

89
Publications
78,493
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
2,999
Citations
Additional affiliations
August 2008 - July 2009
Oklahoma State University - Stillwater
Position
  • PostDoc Position
January 2004 - August 2008
Miami University
Position
  • PostDoc Position

Publications

Publications (89)
Article
Full-text available
Previous research has demonstrated that Senecio repangae subsp. repangae and subsp. pokohinuensis have independent evolutionary origins. Here, we therefore elevate subsp. pokohinuensis to species rank: Senecio pokohinuensis. Updated morphological descriptions for both species are also provided.
Article
A taxonomic synopsis of Philippine Cyrtandra (Gesneriaceae) is presented. Following a study of 138 published names and their types, we accept 98 Cyrtandra species for the Philippine flora. Except for C. angularis, C. elatostemoides, and C. yaeyamae, all are endemic to the country. Lectotypes or neotypes are designated for all names for which this i...
Article
Macrosolen zamboangensis, a new mistletoe species from the Zamboanga peninsula of the island of Mindanao (Philippines), is described. The new species is a member of the widespread M. melintangensis species complex, but differs from the previously described species in this complex in having a conspicuously papillose corolla head. It is also the only...
Preprint
Full-text available
Despite the paramount role of plant diversity for ecosystem functioning, biogeochemical cycles, and human welfare, knowledge of its global distribution is incomplete, hampering basic research and biodiversity conservation. Here, we used machine learning (random forests, extreme gradient boosting, neural networks) and conventional statistical method...
Article
Ridsdalea philippinensis (Rubiaceae), a new species from the karst forest in El Nido (Palawan, Philippines), is described and illustrated. It is unique among Malesian Ridsdalea species in having a corolla tube that is distinctly inflated at the apex, a character state also displayed by R. sootepensis and R. thailandica from Laos and Thailand. Among...
Article
Full-text available
We propose the replacement name Actinodaphne ramosii Brambach & Pelser for Actinodaphne lanceolata (Merr.) Kosterm. ex Brambach & Pelser, an illegitimate later homonym of Actinodaphne lanceolata Dalzell & A.Gibson.
Article
Tetrastigma loheri (Vitaceae) is a vine species native to Borneo and the Philippines. Because it is a commonly encountered forest species in the Philippines, T. loheri is potentially suitable for studying patterns of genetic diversity and connectivity among fragmented forestecosystems in various parts of this country. However, previous research sug...
Article
Full-text available
New names and new combinations are presented for 29 Philippine species in the families Acanthaceae , Aspleniaceae , Cucurbitaceae , Gesneriaceae , Lauraceae , Myrtaceae , Oleaceae , Thelypteridaceae , Urticaceae , and Vitaceae . Seventeen names are lectotypified.
Article
As presently delimited, the endemic New Zealand species Senecio glaucophyllus Cheeseman shows considerable morphological and ecological diversity. Two morphologically similar forms associated with this taxon are found in northwest Nelson (South Island), of which one is often filed in herbaria as S. glaucophyllus subsp. glaucophyllus. The other form...
Article
Melastoma malabituin is described and illustrated. This new species is currently only known from the municipalities of San Mariano and Echague, Isabela Province, Luzon, Philippines, where it is found in remnants of secondary lowland forests in the Sierra Madre mountain range. It is characterized by having densely pilose indumentum on young stems an...
Article
Rafflesia (Rafflesiaceae) is a small endo-holoparasitic Asian plant genus known for its exceptionally large flowers, rare species, and high island endemism. In this study, phylogenetic (parsimony and Bayesian inference) and biogeographic (BioGeoBEARS) analyses of DNA sequence data (atp6 and matR genes, and nad1 B-C intron from the mitochondrial gen...
Article
Gymnosiphon philippinensis is described as a new species of Burmanniaceae from forest over limestone in southern Cebu (Philippines). Among Malesian Gymnosiphon, it is most similar to G. papuanus and G. pauciflorus in having flowers with stamens that are attached in the middle of the floral tube and having outer tepals with entire margins, but these...
Article
Full-text available
Rafflesia speciosa is a threatened endo-holoparasitic species. It has several populations in the Central Panay Mountain Range (CPMR) of Panay island and a single population on Negros Island. Because R. speciosa is the only Philippine species of the genus that is not endemic to an individual island, it is a suitable species for improving our underst...
Article
Full-text available
This dataset provides the Global Naturalized Alien Flora (GloNAF) database, version 1.2. GloNAF represents a data compendium on the occurrence and identity of naturalized alien vascular plant taxa across geographic regions (e.g. countries, states, provinces, districts, islands) around the globe. The dataset includes 13,939 taxa and covers 1,029 reg...
Article
Our recent fieldwork in the island of Negros, Philippines resulted in the discovery of a species new to science, Amyema lisae (Loranthaceae), and a new record for the Philippines, Gastrodia sabahensis (Orchidaceae), which we describe and report here. Amyema lisae differs from similar species with verticillate phyllotaxy and inflorescences of simple...
Article
Vaccinium cebuense (Ericaceae) from Nug-as forest (Alcoy) and the Central Cebu Protected Landscape (Balamban), two of the last remaining forested areas of Cebu Island, Philippines, is here described as a new species. This species is unique among the known species of this genus in displaying a unique combination of characters: leaves with marginal g...
Article
The rosette-forming group of Brachyglottis (Asteraceae: Senecioneae) is a New Zealand endemic species complex in which five species are currently recognised. Although there are clear morphological differences between some members of this group (for example, in trichome characters), morphological intermediates and sites where plants display consider...
Article
Senecio (Asteraceae: Senecioneae) is one of the largest genera of flowering plants and its infrageneric delimitation has been impeded by its large size (> 1000 species), large morphological variation and widespread incongruence between phylogenies derived from different datasets. As part of efforts to improve our understanding of the evolutionary r...
Article
Full-text available
Rafflesia lagascae is a rare endo-holoparasitic species with a disjunct distribution on Luzon Island. It is morphologically very similar to R. manillana from nearby Samar. This study aims to contribute to the taxonomy and conservation of R. lagascae and R. manillana (i.e. the R. lagascae complex) by resolving their patterns of genetic diversity and...
Article
Full-text available
Pittosporum obcordatum (Pittosporaceae; heart-leaved kōhūhū) is an endemic New Zealand plant species that is classified as Threatened–Nationally Vulnerable. It has a disjunct distribution and is only known from relatively few and small populations. Using 10 Inter-Simple Sequence Repeat markers (ISSRs), we studied patterns of genetic diversity and g...
Article
Full-text available
Using the recently built Global Naturalized Alien Flora (GloNAF) database, containing data on the distribution of naturalized alien plants in 482 mainland and 362 island regions of the world, we describe patterns in diversity and geographic distribution of naturalized and invasive plant species, taxonomic, phylogenetic and life-history structure of...
Article
Full-text available
Rafflesia species are endo-holoparasites of Tetrastigma (Vitaceae) vines. Despite receiving considerable attention because of their rarity, enormous flowers, and fascinating parasitic life style, surprisingly little is known about their host specificity and host preference. This lack of information prevents a better understanding of the evolution o...
Article
Gastrodia Brown (1810: 330) is a holomycotrophic terrestrial orchid genus of c. 65 species with an Old World distribution and centre of diversity in Southeast Asia (Cribb et al. 2010, Huang et al. 2015, Ong 2015). In the Philippines, two species are thus far known: G. javanica (Blume, 1825: 421) Lindley (1840: 384) and G. verrucosa Blume (1856: 175...
Article
Full-text available
Lepeostegeres cebuensis s described as a new species from Cebu Island, Philippines. It is unique among currently known species in the genus by having peculiar ridges of orange-brown scales on the young leaves and internodes. This discovery brings the total number of Philippine Lepeostegeres species to three. We consider Lepeostegeres cebuensis to b...
Article
Full-text available
Threats to biodiversity continue to increase worldwide and the conservation of biodiversity through in situ and complementary ex situ measures are more important than ever. Here we studied the presence of introduced tree species in New Zealand considered threatened according to the IUCN Red List of Threatened Species. We conducted desktop assessmen...
Article
Full-text available
All around the globe, humans have greatly altered the abiotic and biotic environment with ever-increasing speed. One defining feature of the Anthropocene epoch is the erosion of biogeographical barriers by human-mediated dispersal of species into new regions, where they can naturalize and cause ecological, economic and social damage. So far, no com...
Article
Full-text available
A new combination, Senecio esperensis, is made for Senecio lautus subsp. esperensis, a narrow-range endemic confined to L’Esperance Rock, the southernmost of the Kermadec Islands group. Senecio esperensis is an ornithocoprophilous species wholly confined to the guano-enriched summit saddle of L’Esperance Rock. It is distinguished from S. lautus s.s...
Article
Nepenthes barcelonae is described as a new species in sect. Insignes, where it is unique in the inset mouth and the dichromic upper pitchers (first-produced pitchers red, later-produced pitchers green) which are also dimorphic. This is a newly recorded phenomenon in the genus: the first produced (primary upper pitchers) are red, larger, stouter, an...
Conference Paper
Pittosporum obcordatum Raoul (Pittosporaceae) is a rare New Zealand plant with a widespread, disjunct distribution. Isolated populations of P. obcordatum have been found from Kaitaia in the North Island to Fiordland in the South Island and this species is classified as “nationally vulnerable”. This research project aims to inform assessments of its...
Article
Full-text available
Senecio australis is confirmed as present in New Zealand. A full description based on New Zealand specimens is also provided. Senecio australis was discovered in New Zealand in 1994. Prior to this date, the absence of supporting specimens had caused this species to be rejected from the New Zealand flora and treated as endemic to Norfolk Island. In...
Article
Stylidium javanicum, a very poorly known species formerly only recorded from Java, Sumba, and New Guinea, is here reported as a new record for the Philippines, where it was found in grasslands in Antique Province of Panay Island. It is morphologically similar to S. alsinoides, the only other Stylidium species known for the country, but can be disti...
Article
Rafflesia mixta Barcelona, Manting, Arbolonio, Caballero & Pelser is described as a new species from the Caraga Region of northeastern Mindanao, Philippines. In their general morphology, the flowers of this species most closely resemble those of R. mira, but they are different in details of the perigone warts and processes, disk color, and relative...
Article
Full-text available
Balanophora coralliformis Barcelona, Tandang & Pelser is described as a new species of Balanophoraceae. It is unique in its coral-like appearance due to the repeated branching of elongated, above-ground tubers and their coarse texture. It most closely resembles B. papuana in details of the staminate inflorescence and is sympatric with this species...
Article
The fern family Matoniaceae C. Presl (1847: 32) is a small group composed of only two genera, Matonia R. Brown in Wallich (1829: 16) and Phanerosorus Copeland (1909: 344) with three or four species characterized by rhizomes with polycyclic solenosteles covered with thick uniseriate hairs, anastomosing veins in fertile parts of the lamina, peltate a...
Article
Full-text available
Rafflesia is a genus of holoparasitic plants endemic to Southeast Asia that has lost the ability to undertake photosynthesis. With short-read sequencing technology, we assembled a draft sequence of the mitochondrial genome of Rafflesia lagascae Blanco, a species endemic to the Philippine island of Luzon, with ∼350× sequencing depth coverage. Using...
Article
Full-text available
A compilation of an unpublished checklist of Philippine vascular plants prepared by the late Leonardo L. Co and the plant photographs he took are the core contents of the Co's Digital Flora of the Philippines (CDFP) website (www.philippineplants.org). The aim of CDFP is to present a continuously updated account of all native and naturalized species...
Article
Full-text available
The southeast Asian holoparasite genus Rafflesia Brown (1821: 207; Rafflesiaceae) is famous for producing the largest flowers on record (Kuijt 1969). Following a series of discoveries of new Rafflesia species and populations, the Philippines recently emerged as one of the centers of its diversity. It is home to no less than ten currently recognized...
Article
Full-text available
Amyema nickrentii Barcelona & Pelser is described here as a new mistletoe species in family Loranthaceae. It was discovered through plant photography fieldwork for the Co’s Digital Flora of the Philippines website in coastal forest at Dicasalarin Cove, Baler, Aurora Province, Philippines. Amyema nickrentii differs from all other described Amyema sp...
Article
Instances of parallel ecotypic divergence where adaptation to similar conditions repeatedly cause similar phenotypic changes in closely related organisms are useful for studying the role of ecological selection in speciation. Here we used a combination of traditional and next generation genotyping techniques to test for the parallel divergence of p...
Article
Full-text available
Senecio sect. Crociseris is one of the three main sections of western Eurasian/northern African Senecio species. Previous studies indicated that species commonly assigned to this section are closely related to those of sect. Doria. The aim of the research presented here was to test the morphology-based delimitation of sect. Crociseris using phyloge...
Article
Full-text available
Historically, two morphologically similar species of rosette-forming Brachyglottis have been recognized by Flora writers as present on Banks Peninsula (Canterbury, New Zealand): B. lagopus (widespread throughout New Zealand) and B. saxifragoides (endemic to the Port Hills). We compared amplified fragment length polymorphism (AFLP) profiles from Ban...
Article
Hybridization is an important evolutionary factor in the diversification of many plant and animal species. Of particular interest is that historical hybridization resulting in the origin of new species or introgressants has occurred between species now geographically separated by great distances. Here, we report that Senecio massaicus, a tetraploid...
Article
Full-text available
At both a macro- and micro-evolutionary level, selection of and performance on host plants by specialist herbivores are thought to be governed partially by host plant chemistry. Thus far, there is little evidence to suggest that specialists can detect small structural differences in secondary metabolites of their hosts, or that such differences aff...
Article
Full-text available
The taxonomic identity of Rafflesia banaoana from Kalinga Province in northern Luzon (Philippines) and its affinity with R. leonardi of the adjacent Cagayan Province are discussed. Both taxa share a unique combination of morphological characters pertaining to the color and shape of the perigone lobes, their warts, the diaphragm aperture, the size a...
Article
Full-text available
Pyrrolizidine alkaloids are characteristic secondary metabolites of the Asteraceae and some other plant families. They are especially numerous and diverse in the tribe Senecioneae and form a powerful defense mechanism against herbivores. Studies into the evolution of pyrrolizidine alkaloid biosynthesis using Senecio species have identified homosper...
Article
Full-text available
The new parasitic plant species Rafflesia verrucosa from Mt. Kampalili in eastern Mindanao (Philippines) is described, bringing the total number of Philippine Rafflesia to ten. Rafflesia verrucosa is the first small-flowered Rafflesia described from Mindanao Island, and differs notably from similar-sized species by the dense and prominently raised...
Article
Full-text available
Robinsonia is a genus of eight species and is endemic to the Juan Fernandez Islands. Previous studies based on ITS phylogenies place Robinsonia deeply nested within Senecio, however its monophyly remains uncertain. In this paper, we use phylogenies reconstructed from plastid, ITS-ETS, and combined data to test its monophyly. Plastid phylogenies sup...
Article
Full-text available
One of the longstanding questions in phylogenetic systematics is how to address incongruence among phylogenies obtained from multiple markers and how to determine the causes. This study presents a detailed analysis of incongruent patterns between plastid and ITS/ETS phylogenies of Tribe Senecioneae (Asteraceae). This approach revealed widespread an...
Article
Full-text available
The three genera Sinosenecio, Nemosenecio and Tephroseris form a closely knit group nested in the subtribe Tussilagininae of the tribe Senecioneae (Asteraceae). The generic limits in this assemblage remain unclear and need revision. In this study, we analysed sequences of the internal transcribed spacer (ITS) region of nuclear ribosomal DNA availab...
Article
Full-text available
The number of Rafflesia species (Rafflesiaceae) reported for the Philippines has grown explosively from two before 2002 to ten or eleven presently. We present an overview of the current knowledge of Philippine Rafflesia by providing a comprehensive account of all the recognized species with their taxonomy, distribution and ecology, plus a key and p...
Article
The 23rd edition of the Heukels' Flora van Nederland' [Heukels' Flora of the Netherlandsi presents a classification of flowering plants that is very different from any classification scheme used in previous editions of this Dutch Flora. These taxonomic changes are due to new insights into the evolutionary relationships between plant families obtain...
Article
Full-text available
The systematic value of morphological characters in Senecio sect. Jacobaea (Asteraceae) is studied using separate and combined parsimony analyses of morphological and DNA sequence data. These analyses are the first studies of morphological characters in a phylogenetic context in Senecio. Although the morphological data set forms a valuable addition...
Article
Full-text available
Lomanthus B. NORD. & PELSER is segregated from Senecio L. as a new genus of the Compositae-Senecioneae. It is distributed in Ecuador, Peru and Bolivia, from coastal lowlands to Andean upper slopes, with two species also extending into Argentina. The 17 species so far recognized are perennial herbs or subshrubs with usually lobed or incised leaves t...
Article
Full-text available
The importance of molecular characters for plant systematics The 23rd edition of the ‘Heukels’ Flora van Nederland’ [Heukels’ Flora of the Netherlands] presents a classification of flowering plants that is very different from any classification scheme used in previous editions of this Dutch Flora. These taxonomic changes are due to new insights int...
Article
Full-text available
The South African monotypic genus Cadiscus E.MEY. ex DC. (Asteraceae-Senecioneae) is an aquatic herb with some morphological features that are unusual in the tribe (white ray-florets and coarse, awn-like pappus bristles) and others that are reminiscent of species of subtribe Othonninae (ecalyculate capitula, relatively few, broad and connate involu...
Article
Full-text available
A new species of Philippine Rafflesia is described. Rafflesia leonardi is the eighth species of Rafflesia described from the Philippines and the fourth species from Luzon Island. It most closely resembles R. lobata and R. manillana in perigone colour and wart ornamentations and in the wide aperture relative to diaphragm diameter. It is, however, di...