Analysis of geographic and taxonomic groups informs conservation of Rhododendron subgenus Vireya (Ericaceae)

MacKay, M.; Smith, G. F.; Gardiner, Susan E.

doi:10.3767/000651916x693275

Cited by 2 publications

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References 30 publications

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“…We have already proposed some elements of an international programme of cooperation (MacKay et al 2016, and the results of the present analysis will enable priority countries of origin to be added to the international framework.…”

Section: Conservation Actionmentioning

confidence: 99%

“…For Rhododendron specifically, we have already proposed actions and priorities for ex situ conservation in relation to subgenera (MacKay & Gardiner 2017) and subg. Vireya (MacKay et al 2016), and many of the underlying principles will also apply to the geographic analysis performed in the present study. The following actions for ex situ conservation are recommended:…”

Section: Conservation Actionmentioning

confidence: 99%

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Geographic analysis of Red List Rhododendron (Ericaceae) taxa by country of origin identifies priorities for ex situ conservation

MacKay¹,

Gardiner²

2017

blum - j plant tax and plant geog

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A Red List assessment is insufficient to determine priorities for ex situ conservation in large genera such as Rhododendron, where there may be hundreds of taxa in any one Red List category. We have utilised an analysis of the geographic origins of 1 215 taxa of Rhododendron (Ericaceae) as a method to prioritise Red List taxa for ex situ conservation. This analysis includes descriptions of distribution and endemism by country of origin, analysis of the incidence of the 715 Red List taxa by country of origin, and determination of the extent to which taxa from each country of origin are in cultivation. We determined that of 30 countries of origin and a 'Europe' aggregate, 24 origins contain Red List taxa. Of those 24 origins, 17 origins and 'Europe' have greater than 75 % of Red List taxa 'in cultivation', as defined in this study, so that Target 8 of the Global Strategy for Plant Conservation has theoretically been met. However, for some of these origins the number of each taxon held 'in cultivation' is very low and genetic diversity is likely to be poor. The remaining six countries of origin have less than 75 % of Red List Rhododendron taxa recorded 'in cultivation' (Indonesia (28 %), Papua New Guinea (29 %), Malaysia (59 %), China (60 %), Japan (62 %) and Solomon Islands (0 %)). Analysis of a set of Red List factors and 'not in cultivation' factors reveals that Red List taxa from Indonesia, China and Papua New Guinea should take priority for ex situ conservation.

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Section: Conservation Actionmentioning

confidence: 99%

Section: Conservation Actionmentioning

confidence: 99%

Geographic analysis of Red List Rhododendron (Ericaceae) taxa by country of origin identifies priorities for ex situ conservation

MacKay¹,

Gardiner²

2017

blum - j plant tax and plant geog

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New Zealand collections of Rhododendron as a resource for ex situ conservation

MacKay

Smith²,

Gardiner

2017

New Zealand Journal of Botany

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Rhododendron L. subgenera. Information comes from the listed monographs unless otherwise cited. See Supplementary Table 4 for a list of sections in each subgenus.Vireya (CB Clark) HF Copel. 400 taxa in 7 sections and 5 subsections.  2n=26, no polyploids observed (Atkinson et al. 2000).  Groundcovers, shrubs, and small trees. Epiphytes common.  Evergreen.  Scaly rhododendrons, large idioblasts in the leaves, do not have branched hairs on the leaves, terminal inflorescence, no rachis in the inflorescence, corolla not zygomorphic (1-2 exceptions), 10 stamens, ovary placentae separate from central axis, seeds of most species have tails.  Leaves in the bud are flat.  Molecular evidence varies. Taxa in the subgenus cluster together relatively consistently and there is a strong geographical influence (Brown et al. 2006; Brown et al. 2006a; Landis et al. 2013), however the relationship to the rest of the genus is not resolved (Craven et al. 2008; Craven et al. 2011; Goetsch et al. 2011). Subgenus Vireya is probably the eastern-most extension of an eastward radiation of Rhododendron from mainland Asia (Landis et al. 2013; Schwery et al. 2014).  Geographically distinct in that it occupies Southeast Asia (Malesian archipelago) and has limited overlap with other subgenera.  Relevant taxonomic monograph: Argent (2015). Rhododendron L. 258 taxa in 2 sections and 30 subsections; however, the 24 taxa in section Pogonanthum have several distinct physical features.  2n=26, polyploidy often observed (Kehr 1975;Jones et al. 2007).  Small to large shrubs, small trees, some creeping shrubs, epiphytes common in some subsections.  Most are evergreen, but a few can be deciduous.  Scaly rhododendrons, inflorescence terminal in most subsections, inflorescence with a central rachis, corolla always zygomorphic and often spotted, stamens usually 10 but can be 5-27, seeds with wings and appendages (section Rhododendron) or without the same (section Pogonanthum).  Shape, colour, size and arrangement of scales are diagnostic.  Leaves in the bud are flat, except for R. pendulum. Leaves of section Pogonanthum have a distinct pineapple smell.

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Analysis of geographic and taxonomic groups informs conservation of Rhododendron subgenus Vireya (Ericaceae)

Cited by 2 publications

References 30 publications

Geographic analysis of Red List Rhododendron (Ericaceae) taxa by country of origin identifies priorities for ex situ conservation

Geographic analysis of Red List Rhododendron (Ericaceae) taxa by country of origin identifies priorities for ex situ conservation

New Zealand collections of Rhododendron as a resource for ex situ conservation

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