Ihsan A. Al-Shehbaz

Missouri Botanical Garden, San Luis, Missouri, United States

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Publications (147)155.22 Total impact

  • 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 · 0.28 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: 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 · 4.02 Impact Factor
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    Diego Leonel Salariato · Fernando O Zuloaga · Ihsan A Al-Shehbaz
    01/2015; 207(1):39-67.
  • 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 · 1.15 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 · 1.38 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 · 2.70 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
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    Diego L. Salariato · Ihsan A. Al-Shehbaz
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    ABSTRACT: Abstract— Zuloagocardamum jujuyensis , a new genus and species of Brassicaceae from Jujuy Province in Argentina, is described and illustrated, and its phylogenetic relationships to nearest relatives are demonstrated. It resembles some genera of the tribe Thelypodieae, such as Chilocardamum and Weberbauera, but differs mainly by having a well-developed woody caudex with reduced leafless stems, rosulate, awl-shaped or linear, sessile, parallel-veined basal leaves conspicuously ciliate with simple trichomes, racemes much shorter than the basal leaves, torulose fruits, and mucilaginous seeds. Phylogenetic analyses, based on DNA sequences of nuclear ITS and plastid ndhF and trnL-F regions, place Z. jujuyensis in the tribe Thelypodieae, where it is related to species of Weberbauera, Englerocharis, and Parodiodoxa. However, it is morphologically different from species of all four genera by the character combinations above.
    Systematic Botany 04/2014; 39(2). DOI:10.1600/036364414X680898 · 1.11 Impact Factor
  • Ihsan A. Al-Shehbaz · Gerald A. Mulligan
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    ABSTRACT: Seven new species of Draba are described and illustrated, and their relationships and distinguishing characters from nearest relatives are discussed. Of these, D. caswellii, D. cayouettei, D.franktonii, D.puvirnituqii, and D. taylori are described from Canada, D. healyi from Alaska, and D. bennettii from both. The new combination D. thompsonii is proposed, and the status of D. chamissonis in North America is confirmed. Draba paysonii is reported herein for the first time from Canada, and its previous reports from the country were shown to be based on misidentified plants of D. novolympica. Draba pycnosperma is recognized as a distinct species from Newfoundland and Québec, and its distinguishing characters from D. glabella, under which it was previously synonymized, are discussed. Draba mulliganii is reported as new to Canada, D. porsildii to Northwest Territories, and D. thompsonii to Yukon Territory. The ten Draba species added in this study bring the total in Canada and Alaska to 58, and a key to all these species is presented.
    Harvard Papers in Botany 12/2013; 18(2):101-124. DOI:10.3100/025.018.0203
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    ABSTRACT: The Brassicaceae family (mustards or crucifers) includes Arabidopsis thaliana as one of the most important model species in plant biology and a number of important crop plants such as the various Brassica species (e.g. cabbage, canola and mustard). Moreover, the family comprises an increasing number of species that serve as study systems in many fields of plant science and evolutionary research. However, the systematics and taxonomy of the family are very complex and access to scientifically valuable and reliable information linked to species and genus names and its interpretation are often difficult. BrassiBase is a continuously developing and growing knowledge database (http://brassibase.cos.uni-heidelberg.de) that aims at providing direct access to many different types of information ranging from taxonomy and systematics to phylo- and cytogenetics. Providing critically revised key information, the database intends to optimize comparative evolutionary research in this family and supports the introduction of the Brassicaceae as the model family for evolutionary biology and plant sciences. Some features that should help to accomplish these goals within a comprehensive taxonomic framework have now been implemented in the new version 1.1.9. A ‘Phylogenetic Placement Tool’ should help to identify critical accessions and germplasm and provide a first visualization of phylogenetic relationships. The ‘Cytogenetics Tool’ provides in-depth information on genome sizes, chromosome numbers and polyploidy, and sets this information into a Brassicaceae-wide context.
    Plant and Cell Physiology 11/2013; 55(1). DOI:10.1093/pcp/pct158 · 4.98 Impact Factor
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    Ingrid Jordan-Thaden · Ihsan A. Al-Shehbaz · Marcus A. Koch
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    ABSTRACT: Draba includes over 390 species distributed globally, mostly in extreme ecosystems at high elevations and latitudes making it the most successful and species-rich genus of the Brassicaceae, particularly in mountain and alpine regions. In this analysis, species richness data were collected from floras and checklists, and species distribution patterns were compared on a global scale for 367 of the species. A compilation of the geographical distribution of the entire genus using a presence/absence matrix was generated and displayed upon geographical maps. The three areas of highest species richness are the northern Andes (48 spp.), central Rocky Mountains (49 spp.), and Tibetan Plateau/C-SW Chinese (Hengduan) mountains (52 spp.). Previous phylogenetic analyses are in congruence with the area cladogram shown herein. It is shown that Draba has a diverse range of distribution patterns from widely spread to narrowly endemic. Species with wider distributions are frequently found in the Arctic, while those with a more narrow distribution are restricted to high elevations. However, ploidy-level information as well as recently presented genetic data convincingly indicates that the European and West Asian biota have served as a primary source and center of origin of the large diversity in the genus. A complete list of accepted Draba species is provided.
    Alpine Botany 09/2013; DOI:10.1007/s00035-013-0120-9 · 2.42 Impact Factor
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    Ihsan A. Al-Shehbaz · Dmitry A. German
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    ABSTRACT: Parrya is broadly circumscribed to include 42 species previously assigned to Achoriphragma, Neuroloma, and Pseudoclausia. An expanded generic description, synopsis of all taxa previously assigned to Parrya, and key to all species herein assigned to it are presented. Fourteen new combinations: Leiospora beketovii (Krasn.) D. A. German & Al-Shehbaz, L. saposhnikovii (A. N. Vassiljeva) D. A. German & Al-Shehbaz, Parrya glabra (Royle) D. A. German & Al-Shehbaz, P. gracillima (Popov ex Botsch. & Vved.) D. A. German & Al-Shehbaz, P. hispida (Regel) D. A. German & Al-Shehbaz, P. mollissima (Lipsky) D. A. German & Al-Shehbaz, P. olgae (Regel & Schmalh.) D. A. German & Al-Shehbaz, P. papillosa (Vassilcz.) D. A. German & Al-Shehbaz, P. pazijae (Pachom.) D. A. German & Al-Shehbaz, P. pjataevae (Pachom.) D. A. German & Al-Shehbaz, P. podlechii (Dvořák) D. A. German & Al-Shehbaz, P. sarawschanica (Regel & Schmalh.) D. A. German & Al-Shehbaz, P. tschimganica (Popov ex Botsch. & Vved.) D. A. German & Al-Shehbaz, and P. vvedenskyi (Pachom.) D. A. German & Al-Shehbaz] and two new names [P. junussovii D. A. German & Al-Shehbaz and P. lipskyi D. A. German & Al-Shehbaz] are proposed. Thirty-eight names are excluded from Parrya (tribe Chorisporeae) and assigned to various genera of the tribes Anchonieae, Arabideae, Boechereae, Camelineae, Erysimeae, Euclidieae, and Smelowskieae, thus reflecting the former broad and artificial circumscription of the genus. Seven taxa are reduced to synonymy with what follows them in parentheses: Neuroloma botschantzevii Pachom. (Parrya pinnatifida Kar. & Kir.), N. griffithii Botsch., N. kunawarense (Royle ex Regel) Botsch., and P. nudicaulis var. dasycarpa Regel (P. glabra), P. angrenica Botsch. & Vved. (P. albida Popov), P. korovinii A. N. Vassiljeva (P. pulvinata Popov), and P. simulatrix Nikitina (P. alba Nikitina). Lectotypes are designated for 19 names, including four partially typified before.
    Kew Bulletin 09/2013; 19(2). DOI:10.1007/s12225-013-9450-4
  • Ihsan A. Al-Shehbaz
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    ABSTRACT: Al-Shehbaz I. A.: Dryopetalon stenocarpum (Brassicaceae), a new species from Coahuila, Mexico. — Willdenowia 43: 121–123. June 2013. — ISSN 1868-6397; © 2013 BGBM Berlin-Dahlem.. Stable URL: http://dx.doi.org/10.3372/wi.43.43114 Dryopetalon stenocarpum is described and illustrated, and its distinguishing characters from the other species of the genus, especially D. paysonii, are discussed.
    Willdenowia 06/2013; 43(1):121-123. DOI:10.3372/wi.43.43114 · 0.51 Impact Factor
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    Ihsan A. Al-Shehbaz · Asunción Cano · Huber Trinidad · Eduardo Navarro
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    ABSTRACT: Six new species of Brassicaceae (Brayopsis chacasensis Al-Shehbaz & A. Cano, Descurainia canoensis Al-Shehbaz, Draba canoensis Al-Shehbaz, Trinidad, Ed. Navarro & D. Rodr.-Paredes, D. punoensis Al-Shehbaz, Ed. Navarro, Trinidad & A. Cano, Neuontobotrys camanaensis Al-Shehbaz & A. Cano, and Weberbauera ayacuchoensis Al-Shehbaz, A. Cano & Trindad) are described and illustrated, and their distinguishing characters from nearest relatives are discussed. Brief notes on the diversity of these five genera in South America, especially Peru, are discussed.
    Kew Bulletin 06/2013; 68(2). DOI:10.1007/s12225-013-9447-z
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    Toro-Nuñez · Mark E. Mort · Eduardo Ruiz-Ponce · Ihsan A. Al-Shehbaz
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    ABSTRACT: Mathewsia (6 spp.) and Schizopetalon (10 spp.) are sister genera of the tribe Schizopetaleae (Brassicaceae, Cruciferae). The genera are mostly endemic to Chile and neighboring areas of Peru and Argentina, with most species growing in the hyperarid Atacama Desert and adjacent areas. This geographic distribution and the presence of different life forms in Mathewsia (perennial) and Schizopetalon (annual) provide the opportunity to compare patterns of diversification under extreme environmental pressure. In this paper, phylogenetic relationships are estimated for 17 species using a combination of two nuclear regions (rDNA ITS + ETS) and four plastid regions (atpI-atpH, trnQ-rps16, trnH-psbA spacers, and rps16 intron) using maximum parsimony, maximum likelihood, and Bayesian approaches. Analyses of the combined cpDNA and the combined nrDNA result in topologies that are highly similar, although several instances of topological incongruence are noted. Results from all three criteria and all datasets support the monophyly of Schizopetalon, but not of Mathewsia. Mathewsia is rendered non-monophyletic because M. nivea is placed outside of Schizopetaleae (Mathewsia + Schizopetalon); a result that is also supported by morphology. The monophyly of some species is confirmed; however, several currently recognized species were not recovered as a clade and will require additional study. Further analyses are needed to resolve the placement of M. nivea and the origins of discordant nuclear and plastid signal.
    Taxon 04/2013; 62(2):343-356. DOI:10.12705/622.4 · 3.05 Impact Factor

Publication Stats

2k Citations
155.22 Total Impact Points

Institutions

  • 2003–2015
    • 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
  • 2004
    • Agriculture and Agri-Food Canada
      • Eastern Cereal and Oilseed Research Centre (ECORC)
      Ottawa, Ontario, Canada
  • 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