Ihsan A. Al-Shehbaz

Missouri Botanical Garden, San Luis, Missouri, United States

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Publications (177)189.7 Total impact

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    ABSTRACT: Database of published chromosome numbers and ploidy-level estimates of the tribe Alysseae is presented, together with the revised generic concept and the list of accepted names, to reflect the most recent taxonomic and phylogenetic studies in Alysseae. It is available on-line at www.alysseae.sav.sk. The tribe encompasses 24 genera and 277 species. Chromosome numbers and/or ploidy levels are known for 171 out of 297 recognized taxa. Of these, 95 (55.6 %) taxa are diploids, 43 (25.1 %) are polyploids, and 33 (19.3 %) involve both diploids and polyploids. The most common base chromosome number in the tribe is x = 8 and less frequent is x = 7. The highest variation in base chromosome numbers (x = 7, 8, 11, 15) is found in the genus Hormathophylla. A key to all genera and descriptions of the two new genera Cuprella and Resetnikia are presented. Many new nomenclatural combinations, mainly in the re-established Odontarrhena (77), are proposed.
    Plant Systematics and Evolution 12/2015; 301(10):2463-2491. DOI:10.1007/s00606-015-1257-3 · 1.42 Impact Factor
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    ABSTRACT: Brassicaceae is one of the most diverse and economically valuable angiosperm families with widely cultivated vegetable crops and scientifically important model plants, such as Arabidopsis thaliana. The evolutionary history, ecological, morphological and genetic diversity and abundant resources and knowledge of Brassicaceae make it an excellent model family for evolutionary studies. Recent phylogenetic analyses of the family revealed three major lineages (I, II, and III), but relationships among and within these lineages remain largely unclear. Here, we present a highly supported phylogeny with six major clades using nuclear markers from newly sequenced transcriptomes of 32 Brassicaceae species and large datasets from additional taxa for a total of 55 species spanning 29 out of 50 tribes. Clade A consisting of Lineage I and Macropodium nivale is sister to combined Clade B (with Lineage II and others) and a new Clade C. The ABC clade is sister to Clade D with species previously weakly associated with Lineage II and Clade E (Lineage III) is sister to the ABCD clade. Clade F (the tribe Aethionemeae) is sister to the remainder of the entire family. Molecular clock estimation reveals an early radiation of major clades near or shortly after the Eocene-Oligocene boundary and subsequent nested divergences of several tribes of the previously polytomous Expanded Lineage II. Reconstruction of ancestral morphological states during the Brassicaceae evolution indicates prevalent parallel (convergent) evolution of several traits over deep times across the entire family. These results form a foundation for future evolutionary analyses of structures and functions across Brassicaceae.
    Molecular Biology and Evolution 10/2015; DOI:10.1093/molbev/msv226 · 9.11 Impact Factor
  • Guoqian Hao · Ihsan Al-Shehbaz · Qian Wang · Qianlong Liang · Jianquan Liu ·
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    ABSTRACT: The new species Eutrema racemosum is described, and its relationship to the closely related E. heterophyllum and E. edwardsii are discussed based on morphological, cytological, and molecular data. The novelty differs from E. heterophyllum by having elongated racemes and from E. edwardsii by somewhat reflexed fruiting pedicels. Four chloroplast DNA fragments and nuclear ITS region were sequenced for multiple individuals of each species. Three species show distinct and stable sequence variations. Eutrema racemosum and E. heterophyllum form a clade sister to that of E. edwardsii in phylogenetic analyses of sequence variations. Our cytological studies revealed that E. heterophyllum is a diploid with the small genome size, while E. racemosum is a tetraploid with duplicate genomes. These available data support the recognition of E. racemosum as a distinct species well differentiated morphologically and genetically, as well as well-isolated reproductively from its sister species E. heterophyllum. We further found some interspecific triploid hybrids between tetraploid E. racemosum and diploid E. heterophyllum, which seem to be sterile according to our germination experiments.
    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
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    Barış Özüdoğru · Galip Akaydın · Sadık Erik · Ihsan A. Al-Shehbaz · Klaus Mummenhoff ·
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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
  • 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: 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
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    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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    Diego L. Salariato · Fernando O. Zuloaga · Asunción Cano · Ihsan A. Al-Shehbaz ·

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    Diego L. Salariato · Fernando O. Zuloaga · Asunción Cano · Ihsan A. Al-Shehbaz ·
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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

Publication Stats

3k Citations
189.70 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
  • 2000
    • The University of Tokyo
      Tōkyō, Japan
  • 1999
    • University of Iowa
      • Department of Biology
      Iowa City, Iowa, United States
  • 1985-1987
    • Harvard University
      Cambridge, Massachusetts, United States