Schefflera (Araliaceae): taxonomic history, overview and progress

Frodin, David G.; Lowry, Porter P.; Plunkett, Gregory M.

doi:10.1127/1869-6155/2010/0128-0028

Cited by 33 publications

(61 citation statements)

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“…is the largest genus in Araliaceae (ca. 600–900 species) with a wide distribution in the tropics and subtropics of both northern and southern hemispheres (Frodin et al, ). The genus has been shown to be polyphyletic (Wen et al, ; Plunkett et al, ).…”

Section: Summary Of Different Infrageneric Classifications Of Asian Smentioning

confidence: 99%

Phylogeny and biogeography of Asian Schefflera (Araliaceae) based on nuclear and plastid DNA sequence data

Wen

2013

J of Sytematics Evolution

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The phylogeny of Asian Schefflera was inferred from sequences of the nuclear ribosomal internal transcribed spacer region, and six plastid regions (the ndhF gene, the trnL‐trnF region, the rps16 intron, the atpB‐rbcL intergenic spacer, the rpl16 intron, and the psbA‐trnH intergenic spacer). Phylogenetic analyses of the combined plastid and internal transcribed spacer data with parsimony and Bayesian methods strongly support the monophyly of Asian Schefflera. The genus is supported to be closely related to Heteropanax and Tetrapanax with the small tropical continental Asian genus Heteropanax as its sister. Within Asian Schefflera, four distinct subclades were identified: (i) the widely distributed Asian Heptapleurum group with no styles in the gynoecium; (ii) the main Agalma group with racemose or spicate inflorescence units with a few umbellate taxa; (iii) the Schefflera hypoleuca group; and (iv) the Schefflera heptaphylla group. In a broader phylogenetic framework of Araliaceae, Asian Schefflera is hypothesized to have originated in continental Asia at 57.41 Mya (95% high posterior density interval of 40.33–76.06 Mya) in the early Tertiary and radiated into the now SE Asia, eastern Himalaya, and E Asia at 46.11 Mya (95% high posterior density interval of 33.02–60.69 Mya). Its subsequent diversification in Asia may have been driven largely by the collision of the Indian plate with the Asian plate in the middle Eocene and the collision of the Australian margin with the Eurasian margin in the early Miocene.

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Section: Summary Of Different Infrageneric Classifications Of Asian Smentioning

confidence: 99%

Phylogeny and biogeography of Asian Schefflera (Araliaceae) based on nuclear and plastid DNA sequence data

Wen

2013

J of Sytematics Evolution

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“…(), will not be repeated here, but to summarize the key points, the genus has been the subject of repeated rounds of expansion (through the discovery and description of new species, as well as the lumping of genera) and segregation, eventually culminating in the decision to treat all species of Araliaceae having palmately compound leaves, ligulate stipules, and unarticulated pedicels, but lacking prickles, as a broadly defined Schefflera s.l. (see Plunkett & al., ; Frodin & al., ), an approach largely pioneered by Frodin (, , , , ) and adopted by other researchers (e.g., Lowry, ; Philipson, ). This definition led to no fewer than 19 segregate genera being treated in synonymy under Schefflera (viz., Actinophyllum Ruiz & Pav., Agalma Miq., Astropanax Seem., Brassaia Endl., Cephaloschefflera (Harms) Merr., Cotylanthes Calest., Crepinella Marchal, Didymopanax Decne.…”

Section: Introductionmentioning

confidence: 99%

Phylogeny, biogeography, and morphological evolution among and within the Neotropical and Asian clades of Schefflera (Araliaceae)

Plunkett

Lowry

Fiaschi

et al. 2019

TAXON

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Schefflera is the largest and most complex genus of Araliaceae, with ~600 described species (and many additional species awaiting formal description), but recent studies indicate that it is polyphyletic, forming five geographically centered clades spread across the major lineages of the family. Significant progress has been made in revising the three smallest clades, but the two largest groups, centered in Asia and the Neotropics, remain poorly understood. To advance our knowledge of these groups, a taxon set of 211 Schefflera samples and 38 samples representing other genera of Araliaceae (including all genera of the “Asian Palmate clade”) was assembled, from which sequences were obtained for six DNA spacer regions, including two nuclear (ITS, ETS) and four plastid markers (rpl32‐trnL, trnF‐rpl32, trnK‐rpl16, psbA‐trnH). Results were compared to an informal system of classification based on morphology. They confirm the monophyly of both the Asian and Neotropical groups, and their inclusion within the Asian Palmate clade, but not as sister groups. In the Neotropical clade, five major subclades can be recognized, four corresponding closely to morphological groupings (Cephalopanax, Crepinella, Didymopanax, Sciodaphyllum) and one that is geographically coherent (Gleasonia). Within Asian Schefflera, there are four major subclades, corresponding closely to currently recognized informal groups (Agalma, Heptaphyllum, Heptapleurum, Hypoleucoi). Biogeographic analyses suggest that both the Asian and Neotropical groups can trace their origins to SE Asia, where Asian Schefflera is still well represented and where Chengiopanax, the possible sister group of Neotropical Schefflera, is native. Trait‐evolution analyses of a remarkable series of convergences in habit, foliar, and reproductive characters suggest multiple independent origins (and some reversals), both within and between the Neotropical and Asian clades of Schefflera.

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“…and (iii) their commonness in many parts of the South-East Asia including Hong Kong, India and Malaysia (Hau and Corlett, 2003;Frodin et al, 2010). Note that S. heptaphylla is not a crop species, and thus it does not need to be grown in soil that has rich organic contents and nutrient concentration (Vetterlein et al, 1993;Roberts, 2000).…”

Section: Selected Tree Species and Growth Conditionmentioning

confidence: 99%

Effects of plant roots on soil-water retention and induced suction in vegetated soil

Leung

Garg

2015

Engineering Geology

209

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Abstract:Plant evapotranspiration (ET) is considered to be a hydrological effect that would induce soil suction and hence influence the stability of geotechnical infrastructure. However, other hydrological effect, such as the change of soil water retention curve (SWRC) induced by roots, is generally ignored. This study aims to investigate and compare the effects of root-induced changes in SWRC with the effects of ET on suction responses in clayey sand. Two series of laboratory tests together with 21 numerical transient seepage analyses were conducted. A tree species, Schefflera heptaphylla, which is commonly used for ecological restoration in many subtropical regions, was selected for investigation. In order to consider any effects of tree variability on induced suction, six tree individuals with similar age were tested with and without the supply of light. It is revealed that under dark condition when ET was minimal, vegetated soil could induce higher suction than bare soil by 100% after subjecting to a wetting event with a return period of 100 years. This may be explained by the increases in the air-entry value and the size of hysteresis loop induced by roots. Water balance calculation from the numerical analyses shows that even under the supply of light, the amount of ET was only 1.7% of the total volume of water infiltrated. This means that during the wetting event, the contribution of ET and root-water uptake to induced suction in vegetated soil was relatively little, as compared with the effects of root-induced change in SWRC.

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Schefflera (Araliaceae): taxonomic history, overview and progress

Cited by 33 publications

References 0 publications

Phylogeny and biogeography of Asian Schefflera (Araliaceae) based on nuclear and plastid DNA sequence data

Phylogeny and biogeography of Asian Schefflera (Araliaceae) based on nuclear and plastid DNA sequence data

Phylogeny, biogeography, and morphological evolution among and within the Neotropical and Asian clades of Schefflera (Araliaceae)

Effects of plant roots on soil-water retention and induced suction in vegetated soil

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