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A Botanical Mystery Solved by Phylogenetic Analysis of Botanical Garden Collections: the Rediscovery of the Presumed-Extinct Dracaena Umbraculifera

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A Botanical Mystery Solved by Phylogenetic Analysis of Botanical Garden Collections: the Rediscovery of the Presumed-Extinct Dracaena Umbraculifera A botanical mystery solved by phylogenetic analysis of botanical garden collections: the rediscovery of the presumed-extinct Dracaena umbraculifera C HRISTINE E. EDWARDS,BURGUND B ASSÜNER,CHRIS B IRKINSHAW C HRISTIAN C AMARA,ADOLPHE L EHAVANA,PORTER P. LOWRY II, JAMES S. MILLER A NDREW W YATT and P ETER W YSE J ACKSON Abstract Extinction is the complete loss of a species, but the discoveries and the importance of documenting and con- accuracy of that status depends on the overall information serving the flora of Madagascar. about the species. Dracaena umbraculifera was described Keywords Botanical garden, Dracaena reflexa, Dracaena in from a cultivated plant attributed to Mauritius, but umbraculifera, extinction, living collections, Madagascar, repeated surveys failed to relocate it and it was categorized as Mauritius, phylogeny reconstruction Extinct on the IUCN Red List. However, several individuals labelled as D. umbraculifera grow in botanical gardens, sug- gesting that the species’ IUCN status may be inaccurate. The goal of this study was to understand ( ) where D. umbracu- Introduction lifera originated, () which species are its close relatives, () whether it is extinct, and () the identity of the botanical xtinction is the complete and total loss of all individuals garden accessions and whether they have conservation Eof a species. In practice, extinction can be defined as ‘the value. We sequenced a cpDNA region of Dracaena from permanent absence of current and future records of a spe- Mauritius, botanical garden accessions labelled as D. um- cies’ (Ladle et al., ). Although this is a relatively straight- braculifera, and individuals confirmed to be D. umbraculi- forward concept, accurately determining and proving that a fera based on morphology, one of which is a living plant in a species is extinct is far from straightforward. Many species private garden. We included GenBank accessions of may be presumed to be extinct, but whether this is actually Dracaena from Madagascar and other locations and recon- the case may depend on factors such as the amount and ac- structed the phylogeny using Bayesian and parsimony ap- curacy of historical data on a species’ distribution; the size of proaches. Phylogenies indicated that D. umbraculifera is its range and the density of its populations; how its range has more closely related to Dracaena reflexa from Madagascar changed over time; the ease with which it can be observed in than to Mauritian Dracaena. As anecdotal information in- the field; and the number of knowledgeable scientists dicated that the living D. umbraculifera originated from searching for it, the effort they expend in searching for it, Madagascar, we conducted field expeditions there and lo- and their overall knowledge of the biota of a region (Ladle cated five wild populations; the species’ IUCN status should et al., ; Lee et al., ). The most convincing evidence therefore be Critically Endangered because , wild indi- for extinction involves species that were once widespread viduals remain. Although the identity of many botanical and well known but then experienced an observable decline garden samples remains unresolved, this study highlights in range and population size, and cannot now be relocated the importance of living collections for facilitating new despite a relatively complete knowledge of the biota of the region and extensive, repeated surveys by qualified biolo- gists. If there is robust evidence for the extinction of a spe- cies, IUCN Red List working groups may determine it to be Extinct or Extinct in the Wild. A considerable number of CHRISTINE E. EDWARDS (Corresponding author), BURGUND BASSÜNER,PORTER P. LOWRY II*, JAMES S. MILLER,ANDREW WYATT and PETER WYSE JACKSON plant species are known to be Extinct in the Wild but still Missouri Botanical Garden, P. O. Box 299, St. Louis, MO 63166, USA persist in cultivation, mainly in botanical gardens. E-mail [email protected] Dracaena umbraculifera (Asparagaceae sensu lato, Byng CHRIS BIRKINSHAW,CHRISTIAN CAMARA and ADOLPHE LEHAVANA, Missouri Botanical et al., ) is an example of a plant species that is currently Garden, Madagascar Research and Conservation Program, Antananarivo, Madagascar categorized as Extinct on the IUCN Red List (Strahm, ). *Also at: Institut de systématique, évolution, et biodiversité, Unité mixte de To our knowledge it has never been observed by botanists in Recherche 7205 (Centre national de la Recherche scientifique/Muséum national the wild and as a consequence has remained a mystery for d’Histoire naturelle/École pratique des Hautes études, Université Pierre et Marie several centuries. Described in by Nicolaus Joseph von Curie), Muséum national d’Histoire Naturelle, Sorbonne Universités, Paris, France Jacquin based on a plant cultivated in the greenhouses of the Received June . Revision requested September . botanical garden at Schönbrunn in Vienna (see Plate a for Accepted October . First published online January . original illustration, Jacquin, ), this species has a Oryx, 2018, 52(3), 427–436 © 2018 Fauna & Flora International doi:10.1017/S0030605317001570 Downloaded from https://www.cambridge.org/core. IP address: 170.106.33.19, on 29 Sep 2021 at 22:49:57, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1017/S0030605317001570 428 C. E. Edwards et al. PLATE 1 (a) The original illustration of Dracaena umbraculifera from Jacquin (), (b) a paniculate inflorescence of Dracaena reflexa in Madagascar (photograph by P. Antilahimena, collection number ), (c) a diffuse paniculate infructescence of Dracaena floribunda in Mauritius (photograph by C. Edwards), (d) a young inflorescence of D. umbraculifera in Ile Sainte-Marie (photograph by Rova Malala Rakotoarivelo), (e) an inflorescence of D. umbraculifera in Ile Sainte-Marie in full flower (photograph by A. Lehavana), and (f) a vegetative individual of D. umbraculifera (photograph by P. Lowry). distinctive morphology, with tightly clustered flowers in a present in the current collections of the Pamplemousses nearly umbellate inflorescence in the centre of the leaves Botanical Garden (now the Sir Seewoosagur Ramgoolam (Plate a), differing from the diffuse, paniculate inflores- Botanical Garden). cences that characterize all other Dracaena (Plate b). Dracaena umbraculifera was subsequently included in a Although Jacquin indicated that the cultivated plant on list of plants of Mauritius (Bojer, ) and described as which he based his description came from the island of growing in the thick forests in the centre of the island and Mauritius (Jacquin, ), its origin is unclear. It may have flowering very rarely. It was also listed as a Mauritian species been collected during a voyage made by Franz Boos and in the Flora of Mauritius and the Seychelles (Baker, ). In Georg Scholl, who sailed to South Africa and Mauritius dur- the more recent Flore des Mascareignes (Marais & Coode, ing – and sent back cases of plants, assembled ), doubt was expressed about whether D. umbraculifera by M. Céré of the Pamplemousses Botanical Garden in was native to Mauritius, as the main evidence that it existed Mauritius. However, there is no surviving documentation of in Mauritius was Bojer’s description. It was suggested that the plants contained in this shipment nor is it known whether Bojer may have confused D. umbraculifera with Dracaena they were all Mauritian natives. Dracaena umbraculifera is not floribunda, which still occurs in central Mauritius, and Oryx, 2018, 52(3), 427–436 © 2018 Fauna & Flora International doi:10.1017/S0030605317001570 Downloaded from https://www.cambridge.org/core. IP address: 170.106.33.19, on 29 Sep 2021 at 22:49:57, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1017/S0030605317001570 Rediscovery of Dracaena umbraculifera 429 that if D. umbraculifera was indeed Mauritian it must be ex- from botanical gardens in seven countries (Table ), as tinct. Following unsuccessful efforts over the previous cen- well as one cultivated accession of Dracaena reflexa from tury to locate living plants in the wild, the species was Missouri Botanical Garden. Individuals from botanical gar- categorized as Extinct in (Strahm, ). dens identified as D. umbraculifera but that are not con- Despite the fact that no natural population of D. umbra- firmed by a flowering specimen are hereafter indicated in culifera has been documented in the wild in Mauritius, it quotes (i.e. ‘D. umbraculifera’). Although other gardens re- may not be extinct, as living plants labelled as D. umbracu- ported having individuals of D. umbraculifera, several flow- lifera have long been grown in botanical gardens around the ered recently and had diffuse-paniculate inflorescences, world. One such plant is growing at the Missouri Botanical confirming that they were incorrectly identified, and were Garden. This stimulated an interest in the true status of this not included in the study. Leaf material of a correctly iden- presumably extinct species and led us to initiate a study to tified, pressed specimen of D. umbraculifera was obtained try to elucidate its origins. The individual at Missouri from the University of Vienna herbarium (WU ; Botanical Garden was obtained in from an unknown Table ). It was prepared in from a plant cultivated in source and, if correctly identified, the IUCN status of the Hortus Botanicus Vindobonensis (now known as the D. umbraculifera should be updated
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