A new species from Thailand and Burma, Dracaena kaweesakii Wilkin &amp; Suksathan (Asparagaceae subfamily Nolinoideae)

Wilkin, Paul; Suksathan, Piyakaset; Keeratikiat, Kaweesak; Welzen, P.C. van; Wiland-Szymańska, Justyna

doi:10.3897/phytokeys.26.5335

Cited by 12 publications

(10 citation statements)

References 4 publications

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“…D. jayniana is endemic to central and NE Thailand [9]. D. kaweesakii is native in N, NE, and central Thailand and adjacent eastern Myanmar [10]. D. yuccifolia grows in Ratchaburi in Thailand to Langkawi in Malaysia [10].…”

Section: Geographical Distributionmentioning

confidence: 99%

“…The southeast Asian Dracaena species belonging into the dragon tree group grow in tropical or subtropical areas with higher rainfall than the previous groups, but they are usually associated with cliffs and the tops of limestone rocks in karstic landscapes [9,10,202,203], where water availability is reduced due to relief and edaphic constraints [204].…”

Section: Ecology Of Plant Communities With Dragon Treesmentioning

confidence: 99%

“…This species is abundant at each of these localities. D. kaweesakii of Thailand and Myanmar was estimated to be 2500 mature individuals, with an area of occupancy of 44 km 2 [10]. Individual populations contain tens to hundreds of specimens [10].…”

Section: Population Size Abundancementioning

confidence: 99%

“…Similarly, D. draco and D. tamaranae both appear on the Red List of endangered species in Spain [205,206,212], with the latter listed as critically endangered. Wilkin et al [9,10] described the endemic D. jayniana and D. kaweesakii of Thailand and Myanmar as endangered. D. cambodiana is a national second-class protected plant in China; it is listed in the Inventory of Rare and Endangered Plants of China, but it is not recognized as an endangered or protected species in Thailand, Cambodia, Laos, or Vietnam [49].…”

Section: Threats and Conservation Statusmentioning

confidence: 99%

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What We Know and What We Do Not Know about Dragon Trees?

Maděra

Forrest

Hanáček

et al. 2020

Forests

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This article is a broad review focused on dragon trees—one of the most famous groups of trees in the world, well known from ancient times. These tertiary relicts are severely endangered in most of the area where they grow. The characteristic features of the dragon tree group are described and the species belonging to this group are listed. This review gathers together current knowledge regarding the taxonomy, evolution, anatomy and morphology, physiology, and ontogeny of arborescent dragon tree species. Attention is also paid to the composition, harvesting, medicinal, and ethnobotanical use of the resin (dragons’ blood). An evaluation of population structure, distribution, ecology, threats, and nature conservation forms the final part of the review. In the conclusions we recommend further avenues of research that will be needed to effectively protect all dragon tree species.

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Section: Geographical Distributionmentioning

confidence: 99%

Section: Ecology Of Plant Communities With Dragon Treesmentioning

confidence: 99%

Section: Population Size Abundancementioning

confidence: 99%

Section: Threats and Conservation Statusmentioning

confidence: 99%

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What We Know and What We Do Not Know about Dragon Trees?

Maděra

Forrest

Hanáček

et al. 2020

Forests

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“…To assess the global Red List status of all 88 Aloe species occurring in the Horn of Africa study area, we adopted a semi-automated approach that combines spatial analysis of occurrence data with expert knowledge (Wilkin et al 2013;Rakotoarinivo et al 2014;Brummitt et al 2015). We used our database of occurrences to calculate two metrics relating to geographic range used in IUCN Red List criterion B for all 88 species: extent of occurrence (EOO) and area of occupancy (AOO).…”

Section: Red List Assessmentmentioning

confidence: 99%

Extinction risk and conservation gaps for Aloe (Asphodelaceae) in the Horn of Africa

et al. 2019

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Identification of conservation priorities is essential for conservation planning, especially as the biodiversity crisis develops. We aimed to support conservation prioritisation by addressing knowledge gaps for the genus Aloe in the Horn of Africa. Specifically, we developed a dataset of herbarium voucher specimens and occurrence data to estimate geographic distribution of 88 species of Aloe and used this to estimate extinction risk and establish the major threats to Aloe in this region. The resulting assessments, each published on the IUCN Red List, show that 39% of the species are threatened with extinction, and the principal threats are the expansion and intensification of crop farming and livestock farming, gathering of plants, and unintentional effects of logging and wood harvesting. We review ex situ conservation in botanic gardens and seed banks, revealing gaps in coverage and urgent priorities for collection, with 25 threatened Aloe species currently unrepresented in seed banks. Protected areas in the region offer limited coverage of Aloe distributions and the most recently designated protected areas are increasingly in regions that do not overlap with Aloe distributions. However, we show with a simple optimisation approach that even a modest increase in protected area of 824 square kilometres would allow representation of all Aloe species, although further data are needed to test the area required to ensure longterm persistence (resilience) of Aloe species.

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