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Introduction
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January 2010 - present
Von Gimborn Arboretum
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- Managing Director
January 1991 - January 2005
August 2003 - December 2009
Publications
Publications (123)
Amorphophallus mirabilis is herein described and illustrated from Hpa‐an District, Kayin State, Myanmar. A detailed description, colour plates, phenology, and a provisional conservation status are provided. In addition, A. napalensis is reported as a newly recorded species for Myanmar. With the discovery of the new species and A. napalensis , Myanm...
Amorphophallus mirabilis is herein described and illustrated from Hpa-an District, Kayin State, Myanmar. A detailed description, colour plates, phenology, and a provisional conservation status are provided. In addition, A. napalensis is reported as a newly recorded species for Myanmar. With the discovery of the new species and A. napalensis, Myanma...
The authors report an accidental yellow-variegated mutation on a living specimen of Sansevieria liberica from a population found near the Liberian coast. The National Tree Museum Gimborn acquired a specimen from the population, which was further propagated by leaf cuttings. Heavy yellow variegation was observed on a new shoot on one of the cuttings...
Two species of the Araceae family, Typhonium praelongum (having tuber of blunt cone shape, very long (about 30 cm) sterile appendix of the spadix, horizontal yellow-orange staminodes with tops turning upwards and a glossy entirely papillate upper surface of the simple leaf blade) and Amorphophallus opalinus (having narrow rhizome-like tuber with en...
On the basis of molecular phylogenetic analyses having indicated that the endemic Australian and New Guinea 'Typhonium' species form a non-sister clade distinct from Asian Typhonium Schott sensu stricto, and those clades displaying consistent ovule differences, fourteen species names are formally transferred from Typhonium to the genus Lazarum A.Ha...
Amorphophallus wasa Naive, K.Z.Hein & Hett., is described and illustrated as a species new to science from the Sagaing Region, Myanmar. It is morphologically similar to A. saraburiensis Gagnep., but can be easily distinguished by its unilocular ovaries and lack of staminodes between pistillate and staminate zones. A detailed description, colour pla...
Euphorbia section Plagianthae contains only two highly distinctive accepted species of Malagasy endemic Euphorbia, restricted to the arid southern part of the island. In this paper we propose an epitype for Euphorbia plagiantha, and a lectotype for Euphorbia fiha, a name designated as a synonym of Euphorbia plagiantha. We also designate a lectotype...
The species Euphorbia linguiformis Hetterscheid, Haevermans & Spannring (2021: 16) has been named erroneously in a recent publication (Haevermans & Hetterscheid 2021) on Euphorbia Linnaeus (1753: 450), not realising that this epithet was already in use for another taxon, Euphorbia linguiformis McVaugh (1961: 184), making our new species an illegiti...
Several species of Malagasy Euphorbia are described and compared to related species in their respective sections, along with identification keys for morphologically close relatives and distribution maps: Euphorbia agatheae, Euphorbia atimovatae, Euphorbia fuscoclada, Euphorbia graciliramulosa, Euphorbia kalambatitrensis, Euphorbia linguiformis, Eup...
In this paper we clarify the identity and natural distribution of Euphorbia milii by defining an epitype for it, and elevate to specific rank infraspecific names published under E. milii and provide detailed synonymy for taxa reinstated at the specific rank such as Euphorbia splendens, Euphorbia bevilaniensis, Euphorbia hislopii. We publish novelti...
A new species of Amorphophallus is described and illustrated here, from the province
of Camarines Norte, Luzon island, the Philippines. The new species, A. caudatus, is
morphologically close to A. luzoniensis in having a verruculose spadix, a similar spathe
shape, and similar size of the ovary. However, the new species is distinct by its larger
lea...
The taxonomic identity of the incompletely described Amorphophallus longispathaceus Engl. & Gehrm. has been a mystery for almost 109 years. Types were assumed destroyed during WWII, other than a sterile isotype at K, the recent discov-ery of a fertile isotype at NY, here designated the lectotype, has enabled the identity of this species to be clari...
Amorphophallus ardii is described and illustrated, and compared to other Indonesian Amorphophallus species. The species was collected in the Matarombeo limestone mountain range in Southeast Sulawesi, Indonesia. The species is restricted to karst areas and endemic to Southeast Sulawesi.
The number of named Philippine species of the genus Amorphophallus ( Araceae - Thomsonieae ) amounts to 13 today. Three existing species names (not included in this count) cannot be attributed to presently recognized species for lack of their holotypes, which were all destroyed in WWII. Five new species are described here and an identification key...
We revisit a case of mimicry in Amorphophallus involving visual mimicry of lichens and colonies of cyanobacteria on their tree-trunk sized petioles. We investigate the entire genus for similar defensive coloration types and report a defensive leaf coloration strategy in several Amorphophallus spp. that involves mimicry, camouflage and plant-mimicki...
Amorphophallus ravenii V. D. Nguyen & Hett., a new species of Araceae, is described from material collected in Vang Vieng District, Vientiane Province, Laos. This species is similar to A. khammouanensis A. Galloway and A. croatii Hett. & A. Galloway, but differs by having an appendix about half the length of the male zone, stigmas about 1.5 times a...
Remarkably little is known about the evolution of the emblematic genus Amorphophallus. To shed new light on phy-logenetic relationships between species of Amorphophallus and test its current classification, the first well-sampled molecular phylogenetic analysis is presented here, comprising 157 species for which we generate nuclear (ITS1) and plast...
Amorphophallus Bl. in Decaisne (1834: 366) is a genus of about 200 species (Li & Hetterscheid 2010) of which 16 occur in China. Of these, 7 species are endemic to China. The new species adds the 8th endemic species to this flora.
Amorphophallus kienluongensis is described as a new species from southern Vietnam. It is morphologically close to A. brevispathus Gagnep. (Thailand) and A. prolificus Hett. & A.Galloway (Thailand). However, it differs from both these species by a stigma with a central depression and an obconic male portion. So far A. kienluongensis is known only fr...
The Javan endemic Amorphophallus discophorus (Araceae) was a rare submontane species on Mt. Kediri. It is now suspected to have gone extinct in the wild.
Since the revision of Amorphophallus of Madagascar (Bot Jahrb Syst 121(1):1–17, 1999) several additional new species have been described. The recent discovery of another new species promted the preparation of a revised key as well as the description of the new species. Amorphophallus hildebrandtii, never restudied since its analysis by Engler in 18...
There are 213 known species of Amorphophallus Blume ex Decne. (Hetterscheid 1996–2013) distributed in Asia, Africa, Madagascar, Malay Archipelago, Australia and Melanesia (Mayo et al. 1997). Ten species are known in the Philippines, viz. A. dactylifer Hett., A. declinatus Hett., A. longispathaceus Engl. & Gehrm., A. luzoniensis Merr., A. merrillii...
The rare Araceae species Pseudohydrosme gabunensis has been in cultivation for a few years following its recent introduction by the first author. This is the first description of the entire growing cycle of the species incl. fruit set. All stages are illustrated. An updates species description is presented.
Three new Amorphophallus species from Indochina are presented and illustrated, A. hemicryptus, A. nicolaii and A. pulchellus.
Amorphophallus natolii is described and illustrated as a new species from limestone hills near El Nido, Palawan island, Philippines. It differs most distinctly from other species of Amorphophallus with a densely hairy appendix by its much smaller size and dominant reddish pinkish colours of the spathe. A preliminary molecular analysis shows it to b...
Amorphophallus titanum was succesfully crossed with A. variabilis. One of the resulting seedlings is here presented as a new cultivar A. 'John Tan'.
The new Araceae species Amorphophallus terrestris is described and illustrated.
The Araceae genus Pseudodracontium is reduced to Amorphophallus based on both morphological and molecular evidence. New nomenclatural combinations are presented.
This study identifies Forsythia germplasm and evaluated the genetic relationships of F. ×intermedia hybrids, cultivars and their putative parental species. Leaf samples of F. ×intermedia cultivars and species, such as F. koreana and F. suspensa, were collected in the Netherlands, Korea, and USA. Total genomic DNA was extracted and evaluated by rand...
The genus Amorphophallus is discussed i.e. natural history, diversity of species and cultivation requirements of this legendary genus of aroids.
The first family-wide molecular phylogeny of the Araceae, a family of about 3800 published species in 120 genera, became available in 1995, followed by a cladistic analysis of morpho-anatomical data in 1997. The most recent and comprehensive family-wide molecular phylogeny was published in 2008 and included species from 102 genera. We reanalyzed th...
A review of the white-flowered Amorphophallus species in Sarawak is presented. A total of five species are recognized, four of which belong to the Eburneus Group and are restricted to limestone, and moreover, locally
endemic: A. eburneus Bogner (Padawan and Tebedu areas), A. brachyphyllus Hett. (Bau), A. juliae sp. nov. (Merirai) and A. niahensis s...
Sequences of three different genes in 69 taxa of Amorphophallus were combined to reconstruct the molecular phylogeny of this species-rich Aroid genus. The data set was analyzed by three different methods, Maximum Parsimony, Maximum Likelihood and Bayesian analysis, producing slightly different tree topologies. Three major clades identified in all a...
Introduction Species Concepts in Wild Plants Classification Philosophies in Wild and Cultivated Plants Brief History of Nomenclature and Codes Fundamental Differences in the Classification and Nomenclature of Cultivated and Wild Plants A Comparison of the ICBN and ICNCP Possible New Codes Cultivated Plant Nomenclature and the Law Cultivar Epithets...
With in excess of 70 species, the Southeast Asian/Australian genus Typhonium is the largest genus of the Areae, a tribe that includes up to nine smaller genera of which Sauromatum and Lazarum have recently been reduced to the synonymy of Typhonium. To test the circumscription and relationships of Typhonium to the other Areae, we used chloroplast an...
With in excess of 70 species, the Southeast Asian/Australian genus Typhonium is the largest genus of the Areae, a tribe that includes up to nine smaller genera of which Sauromatum and Lazarum have recently been reduced to the synonymy of Typhonium. To test the circumscription and relationships of Typhonium to the other Areae, we used chloroplast an...
Malagasy relatives of the Crown-of-Th orns (Euphorbia milii Des Moul.) are well known worldwide for their ornamental value. Malagasy taxa account for almost 10% of the genus Euphorbia L., with 110 accepted names constituting subgenus Lacanthis (Raf.) M.G.Gilbert. Th e chaotic taxonomy combined with the poor state of preservation of most herbarium s...
The tribe Thomsonieae (Araceae) comprise two genera of palaeotropical herbs: Amorphophallus with approximately 200 species and Pseudodracontium with seven species. A phylogenetic study of the Thomsonieae is presented. Nucleotide sequences of the chloroplast gene matK and the trnL intron were analyzed for 46 Amorphophallus species, two Pseudodracont...
Two species of the Araceae genus Caladium are described new to science, C. clavatum and C. praetermissum. Material of C. preatermissum has been in the trade for many years under the name Alocasia 'Hilo Beauty'.
Twnety years of taxonomic research by the first author and aditional molecular data by the second author were orally presented at the Xth Intern. Aroid Conference in Nancy. Only figures are presented. Oral tekst not included.
This eighth edition of the International Code of Nomenclature for Cultivated Plants (2009) replaces the seventh edition of the Code which was published in February 2004 as Acta Horticulturae Vol. 647 and as Regnum Vegetabile Vol. 144. This Code contains the international rules for naming agricultural, forestry and horticultural plants for use by ev...
https://www.ishs.org/system/files/scripta-documents/sh_10.pdf
Haigh, A., Bogner, J., Boyce, P.C., Grayum, M.H., Kostelac, C., Croat, T.B., Hay, A., Hetterscheid, W.L.A., Keating, R., Lay, L., Mayo, S.J., Mora, M., Reynolds, L., Sellaro, M., & Wong S.Y. A new website for Araceae taxonomy on www.cate–araceae.org. Aroideana 31: 148–154 2008
Potato classification has always been a chaos caused by very different taxonomic opinions of species limits. This chapter proposes to discard focus on species limits but instead creates a user-driven classification for potato cultivars. Such cultonomic classifications free us from the burden of unstable taxonomies of important crop plants.
There have been several proposals for classification categories for systematic groups of domesticated plants. In the 6th edition of the International Code for Nomenclature of Cultivated Plants (ICNCP) only two main categories were included, the cultivar and the cultivar-group. The 7th edition of ICNCP saw the introduction of the Group to encompass...
Two new species of the genus Amorphophallus (Araceae) are described from Madagascar. An updated key to the Malagasy species is presented.
Fourteen new species of the genus Amorphophallus are described from SE Asia, based mainly on material in existing living collections. The affinities of the species to existing ones are discussed.
Three new species of the Araceae genus Typhonium are described. They were discovered among material in long-standing living collections. A correction to the key published in Hetterscheid et al. (2001) is provided.
A strict consensus tree based on chloroplast and nuclear sequences ( rbc L, mat K, trn L, FLint2 ) from 46 Amorphophallus species, two Pseudodracontium species and six outgroups is used to develop a hypothesis for the evolution of ornamentation and ectexine ultrastructure in the pollen of Amorphophallus . There are four main clades: an exclusively...
The tribe Spathicarpeae is one of the most poorly known-tribes in the Araceae. Recently, field collections in some areas of
Bolivia have revealed many interesting members of this tribe. Two new species,Gorgonidium striatum Hett., P. L. Ibisch & E. G. Gonç. andSpathantheum fallax Hett., P. L. Ibisch & E. G. Gonç. are here described, illustrated, and...
Three new Thai species from the genus Arisaema, section Fimbriata, are described and illustrated. Their relations with other species in Fimbriata are discussed and the lectotypification of A. putii Gagnep. is made.
Three new species of Amorphophallus from Asia are described. Their morphological similarities to other species are discussed.
Het biodiversiteitsverdrag (BDV) heeft tot doel om de nu nog aanwezige biodiversiteit in de wereld te beschermen. Wat betekent dit voor botanische tuinen, wat houdt de gedragscode botanische tuinen in en wat voor gevolgen heeft dit voor de boomkwekerij
A new species Typhonium watanabei J.Murata, Sookchaloem & W.Hett. is described from Thailand.
Three new species of Typhonium (T. bachmaense, T. lineare and T. penicillatum) are described from Vietnam.
Seventeen new species of Typhonium (T. adnatum, T. digitatum, T. echinulatum, T. gallowayi, T. gagnepainii, T.glaucum, T. griseum, T. medusae, T. orbifolium, T. pedunculatum, T. pusillum, T. reflexum, T. saraburiensis, T. subglobosum, T. tentaculatum, T. varians and T. bognerianum) are described from Thailand. A key to all Thai Typhonium is present...
Sixteen new Amorphophallus (Araceae) species from East Malaysia, Thailand and Vietnam are described and figured. Moreover, six species, four of which were originally published by the first author, are synonymized.
The Araceae genus Sauromatum is put into synonymy of the genus Typhonium. Several new nomenclatural combinations are presented.
Amorphophallus kiusianus (Araceae) from eastern China and Southern Japan is presented and depicted.
There is an increasing interest in a cultonomic approach towards the classification and nomenclature of cultivated plants. The way it promotes and implements cultivar classification is especially appealing to those who need more stability of names in the everyday practice of dealing with cultivated plants (breeders, growers, traders, consumers, law...
As part of a monograph of the genus Amorphophallus, the species of Madagascar have been investigated et.
Switching emphasis from a plant-centered to a human-centered taxonomy of cultivated plants may be the basis for an improved stability of nomenclature. The application of the culton concept (cultonomy) provides the necessary reasons for and implementation of this switch. An important tool in this respect is the current International Code of Nomencla...
The pollen of Amorphophallus and Pseudodracontium has been studied with light microscopy and scanning and transmission electron microscopy. Amorphophallus pollen is always inaperturate, has a wide size range, and shows highly diverse exine surfaces. Eight main surface types have been distinguished, most of which are not clear-cut and show considera...
The pollen of Amorphophallus and Pseudodracontium has been studied with light microscopy and scanning and transmission electron microscopy. Amorphophallus pollen is always inaperturate, has a wide size range, and shows highly diverse exine surfaces. Eight main surface types have been distinguished, most of which are not clear-cut and show considera...
The inflorescence odours of 18 species of Amorphophallus and two species of Pseudodracontium were analysed by headspace techniques and compared to the limited data on potential pollinators. The odours of species with ‘gaseous’ or carrion smells had a simple chemical composition, consisting mainly of dimethyl oligosulphides. The odours of other Amor...
The rare aroid Filarum manserichensis is described for the first time since its discovery based on newly found living material.
Cytological data of Amorphophallus margaritifer are presented.
SUMMARY Recent increase in commercial breeding in the genus Aster of cultivars particularly suitable for the cut-flower industry calls for a reassessment of the systematics of cultivated asters. A system of three cultivar-groups is proposed here to encompass most of the diversity of cultivars based on typical user criteria: the Dumosus Group, the U...
