Ihsan A. Al-Shehbaz

Missouri Botanical Garden, San Luis, Missouri, United States

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Publications (165)169.6 Total impact

  • Guoqian Hao · Ihsan Al-Shehbaz · Qian Wang · Qianlong Liang · Jianquan Liu
    Phytotaxa 08/2015; 224(2):185. DOI:10.11646/phytotaxa.224.2.5 · 1.32 Impact Factor
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    Dmitry A. German · Ihsan A. Al-Shehbaz
    Taxon 08/2015; 64(4). DOI:10.12705/644.21 · 3.30 Impact Factor
  • Huan Hu · Ihsan A. Al-Shehbaz · Yongshuai Sun · Guoqian Hao · Qian Wang · Jianquan Liu
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    ABSTRACT: Species delimitation is fundamental to the basic understanding of biodiversity because of the central role that the concept of species plays in most branches of biology. However, few studies have been designed to test conflicting delineations of plant species under an integrated species concept using DNA barcodes in combination with other lines of evidence. Such an approach may deliver more objective, testable and uniform species units as subjects for a range of studies. Here we aim to examine competing hypotheses of species delimitation in Orychophragmus, a member of the mustard family, based on these methods and principles. Two to seven species have previously been recognized in this genus by different taxonomists. We sequenced five commonly used DNA barcodes (nuclear ribosomal ITS and chloroplast matK, rbcL, trnH-psbA, and trnL-F) for 160 individuals collected across the major distribution ranges of all taxa currently recognized in the genus. Based on the monophyletic clusters produced by analysis of the combined nrITS and cpDNA sequence variations, we recovered nine independent evolutionary lineages that were further supported by diagnosable morphological traits, distinct inter-cluster genetic gaps, reproductive isolation, and geographical distribution. These lineages may be treated as nine species. We also found substantial differences in the capacity of nrITS and cpDNA barcodes to discriminate between closely related species in two clades of the genus. Our empirical study of Orychophragmus highlights the importance of applying both chloroplast DNA and nrITS barcodes for species delimitation in plants.
    Taxon 08/2015; 64(4). DOI:10.12705/644.4 · 3.30 Impact Factor
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    ABSTRACT: Ricotia (Brassicaceae) is a genus of nine species endemic to the eastern Mediterranean region. Its phylogenetic relationships, monophyly, and tribal placement have not yet been adequately addressed. To achieve this, sequence data from the nuclear-encoded ribosomal internal transcribed spacer (ITS) and chloroplast DNA (trnL-F region) were analysed by parsimony, maximum likelihood, and Bayesian methods for 45 Ricotia accessions, representing all species and covering their entire distribution ranges, along with outgroups of selected members of main Brassicaceae lineages and tribes. The results clearly indicate, with high posterior probability/bootstrap support, that Ricotia is monophyletic and together with Lunaria should be assigned, with Biscutella and Megadenia, to tribe Biscutelleae. Divergence time estimations, using both a secondary calibration approach and published ITS substitution rates, indicate that the origin of Ricotia (crown group age, 9.2–11.3 Ma) predates the onset of the Mediterranean climate after the Messinian Salinity Crisis (5.9–5.3 Ma). We tentatively conclude that diversification within Ricotia was affected by climate changes during that geological epoch which had a great impact on the speciation history of the Mediterranean flora and fauna. Ancestral area reconstruction analyses revealed that Mediterranean Ricotia species arose in southwest Anatolia (likely Antalya region), whereas the origin of the genus remained unclear. Finally, a perennial life cycle appears to be ancestral in Ricotia, as revealed by an ancestral character state reconstruction analysis.
    Taxon 08/2015; 64(4). DOI:10.12705/644.5 · 3.30 Impact Factor
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    ABSTRACT: Abstract— Hybrid speciation is relatively common in plants compared to other well-studied groups. Polyploidy and apomixis are strongly associated with hybrid speciation, presumably due to the opportunities they provide for both reestablishing reproductive function in hybrids with incomplete chromosomal homology and creating rapid reproductive isolation in sympatry. Boechera, a species-rich genus closely related to Arabidopsis, is a particularly fertile ground for the study of hybrid speciation. Thirty-eight apomictic triploid hybrid species are currently recognized in Boechera. Recent research has shown that apomictic diploid hybrids, although very rare in angiosperms, are common in Boechera. Given this complexity, focused studies of individual species complexes are critical to understanding speciation and diagnosing biodiversity in Boechera. Here we analyze DNA sequences from seven nuclear loci and multilocus genotypes from 15 microsatellite markers in a group of closely related taxa formerly included in B. fendleri. Our results support the recognition of four species previously segregated from B. fendleri s. l., including three genetically distinct, sexual diploids (B. fendleri, B. spatifolia, and B. texana) and one apomictic triploid hybrid (B. porphyrea). We also identify four novel apomictic diploid hybrid species ( B. carrizozoensis , B. centrifendleri , B. sanluisensis , and B. zephyra ) and additional apomictic triploid hybrids. Our results reveal a complex network of relationships. Sexual diploid species can hybridize to form apomictic diploids, and members of these two groups can hybridize to form trigenomic, apomictic triploids.
    Systematic Botany 08/2015; 40(2):572-596. DOI:10.1600/036364415X688745 · 1.23 Impact Factor
  • Dmitry A German · Ihsan Ali Al-Shehbaz
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    ABSTRACT: The present paper deals with the typification of 25 names (11 species, 13 varieties, and one form) in the Brassicaceae, of which the majority (19 names) is in Draba. In addition, Arabis tibetica var. bucharica, A. tibetica var. pinnatifida, Eutrema potaninii, Pseudobraya kizyl-arti, Sisymbrium mollissimum f. pamiricum, and Winklera patrinoides, which are currently treated as synonyms in the genera Crucihimalaya (3 names), Draba, Eutrema, and Lepidium (one name each), are also typified. Most of the original material was collected from the five Middle Asian republics of the Former Soviet Union (especially Kyrgyzstan and Tajikistan), and some other was from China, with a few syntypes of three Draba taxa originating from Asian Russia, Mongolia, Kashmir, and Sikkim.
    Phytotaxa 07/2015; 221(1):57. DOI:10.11646/phytotaxa.221.1.5 · 1.32 Impact Factor
  • Ihsan A. Al-Shehbaz · Paúl Gonzáles · Asunción Cano
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    ABSTRACT: Englerocharis blanca-leoniae is described and illustrated, and its relationship to the closely related E. peruviana is discussed. As a result, Englerocharis now includes five species, all except the latter are narrowly endemic to Peru and known from single collections. The generic limit is expanded to accommodate the new species, and a key to the five known species of the genus is presented.
    Harvard Papers in Botany 06/2015; 20(1):1-4. DOI:10.3100/hpib.v20iss1.2015.n1
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    Ihsan A. Al-Shehbaz · Paúl Gonzáles · Asunción Cano
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    ABSTRACT: Weberbauera incisa Al-Shehbaz, P. Gonzáles & A. Cano (Brassicaceae), a new species from southern Peru, is described and illustrated. It differs from the closely related W. spathulifolia (A. Gray) O. E. Schulz by being completely glabrous and by having incised leaves, flattened and papery petioles of basal leaves, and torulose fruits.
    Novon A Journal for Botanical Nomenclature 06/2015; 24(1):6-8. DOI:10.3417/2015003 · 0.26 Impact Factor
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    Karol Marhold · Matúš Kempa · Ihsan A Al-Shehbaz
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    ABSTRACT: Lectotypes of twenty-eight names of taxa currently recognized or synonymized in Cardamine are designated as part of the work on the account of the genus for the Pan-Himalayan Flora. Among them, the previous first-step lectotypification of the name Cardaminecalthifolia is finalized. In cases when specimen images are available online, stable identifiers for specimens, other permanent links, or links via JSTOR Global Plants are provided.
    PhytoKeys 05/2015; 50(50):9-23. DOI:10.3897/phytokeys.50.5080 · 0.69 Impact Factor
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    Diego L. Salariato · Fernando Omar Zuloaga · Ihsan A. Al-Shehbaz
  • Ihsan A. Al-Shehbaz
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    ABSTRACT: The new species Aphragmus pygmaeus Al-Shehbaz (Sichuan) and Cardamine pseudotrifoliolata Al-Shehbaz (Xizang or Tibet) are described and illustrated. Their distinguishing characters from the respectively nearest relatives A. oxycarpus (Hook. f. & Thomson) Jafri and C. trifoliolata Hook. f. & Thomson are discussed.
    Novon A Journal for Botanical Nomenclature 05/2015; 24(1). DOI:10.3417/2015002 · 0.26 Impact Factor
  • Ihsan A. Al-Shehbaz
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    ABSTRACT: Al-Shehbaz I. A.: Correction of the type locality of Dryopetalon stenocarpum (Brassicaceae). — Willdenowia 45: 95. 2015. — Version of record first published online on 17 March 2015 ahead of inclusion in April 2015 issue; ISSN 1868-6397; © 2015 BGBM Berlin-Dahlem. DOI: http://dx.doi.org/10.3372/wi.45.45110 The type locality of the recently published Dryopetalon stenocarpum Al-Shehbaz was incorrectly cited in the protologue. The correct type locality data are provided here.
    Willdenowia 04/2015; 45(1):95-95. DOI:10.3372/wi.45.45110 · 0.72 Impact Factor
  • Ihsan A. Al-Shehbaz
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    ABSTRACT: Cardamine hongdeyuana, a Tibetan endemic, is described and illustrated. Its distinguishing characters from the nearest relative C. yunnanensis are discussed. A brief note of the diversity of Cardamine in China is given.
    Kew Bulletin 03/2015; 70(1). DOI:10.1007/s12225-014-9556-3
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    ABSTRACT: Tribe Eudemeae comprises a morphologically heterogeneous group of genera distributed along the Andes of South America from Colombia southward into southern Chile and Argentina. The tribe currently includes seven genera: Aschersoniodoxa, Brayopsis, Dactylocardamum, Delpinophytum, Eudema, Onuris, and Xerodraba, and exhibits a wide morphological diversification in growth habit, inflorescences, and fruits. However, little is known about the phylogenetic relationships and evolution of the tribe. We present here a molecular phylogeny of representative sampling of all genera, utilizing sequence data from the nuclear ribosomal ITS region and chloroplast regions trnL-F, trnH-psbA, and rps16. Additionally, climatic niches of the tribe and its main lineages, along with the evolution of diagnostic morphological characters, were studied. All analyses confirmed the monophyly of Eudemeae, with the exception of Delpinophytum that was included with genera of the lineage I of Brassicaceae. Eudemeae is divided into two main lineages differentiated by their geographical distribution and climatic niche: the primarily north-central Andean lineage included Aschersoniodoxa, Brayopsis, Dactylocardamum, and Eudema, and the Patagonian and southern Andean lineage included Onuris and Xerodraba. Finally, ancestral-state reconstructions in the tribe generally reveal multiple and independent gains or losses of diagnostic morphological characters, such as growth form, inflorescence reduction, and fruit type. Relevant taxonomic implications stemming from the results are also discussed.
    Molecular Phylogenetics and Evolution 01/2015; 82. DOI:10.1016/j.ympev.2014.09.030 · 3.92 Impact Factor
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    Diego Leonel Salariato · Fernando O Zuloaga · Ihsan A Al-Shehbaz
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    ABSTRACT: Xerodraba is a South American genus distributed exclusively in the Andean-Patagonian region of southern Argentina and Chile. It is characterized by forming cushions with imbricate, scalelike leaves and solitary, terminal flowers. An updated taxonomic revision of the genus based on morphological analyses using both qualitative and quantitative characters is presented here. Xerodraba currently includes five species distributed in Argentina, of which two also grow in Chile. Xerodraba pectinata is reduced to synonymy of X. lycopodioydes, and X. pycnophylloides is treated as a subspecies of X. patagonica. The new combination X. patagonica subsp. pycnophylloides is proposed. Descriptions, keys to all taxa, updated geographical distributions, maps, and illustrations are provided.
    01/2015; 207(1-1):39-67. DOI:10.11646/phytotaxa.207.1.2
  • Oscar Toro · Ihsan A. Al-Shehbaz · Mark E. Mort
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    ABSTRACT: Phylogenetic analyses have suggested that Mathewsia is not monophyletic because of the exclusion of M. nivea from a well-supported clade comprising the remaining species of the genus. This result suggests that M. nivea should be recognized as a new taxon in Brassicaceae. Nevertheless, the lack of phylogenetic placement and limitations in morphological differentiation from other Mathewsia species preclude its practical recognition. Phylogenetic and hypothesis testing analyses were conducted to elucidate the possible tribal position of M. nivea in Brassicaceae. At the same time, ecological niche for M. nivea and Mathewsia species was modeled to evaluate a possible climatic and geographic circumscription for both taxa. Phylogenetic analyses supported a most likely tribal affinity, but not the inclusion, of M. nivea with Schizopetaleae, supporting previous molecular and morphological evidence. Ecological niche model analysis revealed non-overlapped areas of occurrence between M. nivea with M. auriculata and the remainder of the genus Mathewsia, implying that M. nivea occurrs in a different ecological niche than Mathewsia in the Andes. Therefore, the new monotypic genus Atacama and its species A. nivea are defined. This circumscription reveals important insights about the diversification of Schizopetaleae, as close relationship of A. nivea with Schizopetaleae could help the comparative analysis of biological adaptations to aridity. Likewise, the concomitant discovery of A. nivea with other monotypic taxa of Brassicaceae in the area might suggest possible areas of co-diversification in Andean-arid latitudes of South America.
    Plant Systematics and Evolution 10/2014; 301(5). DOI:10.1007/s00606-014-1157-y · 1.42 Impact Factor
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    ABSTRACT: A general review of the taxonomic status of Thlaspi past and present is given, and a critical evaluations of its segregates based on both morphological and molecular data are presented. ITS molecular phylogenetic study of Thlaspi aghricum and related species, as well as seed-coat morphology and anatomy strongly support the placement of the species in Noccaea. The new combination N. aghrica is proposed, and detailed description and distribution of the species are given.
    Phytotaxa 09/2014; 178(4):287-297. DOI:10.11646/phytotaxa.178.4.2 · 1.32 Impact Factor
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    ABSTRACT: Erysimum includes 150–350 species distributed in the Northern Hemisphere, with Eurasia being the centre of greatest diversity. It is well known for its taxonomic complexity as a result of overlapping morphological characters. We present the first densely sampled phylogenetic analysis of Erysimum using internal transcribed spacer (ITS) DNA sequences from c. 85% of the species (117 for the first time), representing the full range of morphological variation and geographical distribution. We used several approaches to reconstruct phylogenetic relationships, dating of diversification and patterns of evolution of morphological characters in the genus. Ancestral-state reconstructions of four morphological diagnostic characters were performed using maximum parsimony, maximum likelihood and Bayesian methods. Our phylogenetic framework strongly supports the monophyly of Erysimum and recovers some well-supported clades that are geographically, rather than morphologically, correlated. Our study confirms the placement of Erysimum in lineage I and reveals two Malcolmia spp. (M. maritima and M. orsiniana) as its sister taxa. The results suggest that the biennial duration and caespitose habit (vs. annual or perennial duration and herbaceous or woody habit) and large, yellow, glabrous (vs. small, non-yellow, pubescent) petals are ancestral in Erysimum. The ancestral-state reconstruction results show that annual vs. perennial and woody vs. herbaceous features have been independently derived several times. The dating analyses suggest an early radiation of Erysimum during the late Pliocene or early Pleistocene.
    Botanical Journal of the Linnean Society 08/2014; 175:497-522. DOI:10.1111/boj.12184 · 2.53 Impact Factor
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    Ihsan A. Al-Shehbaz · Dmitry A. German · Klaus Mummenhoff · Hamid Moazzeni
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    ABSTRACT: The Malcolmia s.l. complex was so broadly delimited that it included at least five genera in four tribes. As delimited herein, it includes Malcolmia s.str. (12 taxa, 6 spp.) of the tribe Malcolmieae, Maresia (5 spp.) and the new genus Marcus-Kochia (4 spp.) of the tribe Anastaticeae, Strigosella (23 spp.) of the tribe Euclidieae, and Zuvanda (3 spp.) of the tribe Conringieae. The new combinations M.-K. arenaria, M.-K. littorea, M.-K. ramosissima, and M.-K. triloba are proposed. Detailed generic descriptions, key to genera and their species, and data on type collections of all recognized taxa are provided. Second-step lectotypes are designated keys for Strigosella hispida, S. scorpioides, and Zuvanda meyeri. All taxa previously placed in Malcolmia are listed, and their current tribal, generic, and species assignments are given.
    Harvard Papers in Botany 07/2014; 19(1):53-71. DOI:10.3100/hpib.v19iss1.2014.n4

Publication Stats

2k Citations
169.60 Total Impact Points


  • 1996–2015
    • Missouri Botanical Garden
      San Luis, Missouri, United States
  • 2014
    • Instituto de Botánica Darwinion
      Darwin, Río Negro, Argentina
  • 2009
    • Universität Heidelberg
      • Division of Biodiversity and Plant Systematics
      Heidelburg, Baden-Württemberg, Germany
  • 1999–2003
    • University of Iowa
      • Department of Biology
      Iowa City, Iowa, United States
  • 2000
    • The University of Tokyo
      Tōkyō, Japan
  • 1985–1987
    • Harvard University
      Cambridge, Massachusetts, United States