Knud Ib Christensen

598 total citations
32 papers, 473 citations indexed

About

Knud Ib Christensen is a scholar working on Plant Science, Ecology, Evolution, Behavior and Systematics and Molecular Biology. According to data from OpenAlex, Knud Ib Christensen has authored 32 papers receiving a total of 473 indexed citations (citations by other indexed papers that have themselves been cited), including 22 papers in Plant Science, 9 papers in Ecology, Evolution, Behavior and Systematics and 7 papers in Molecular Biology. Recurrent topics in Knud Ib Christensen's work include Botanical Studies and Applications (15 papers), Botany and Plant Ecology Studies (15 papers) and Horticultural and Viticultural Research (9 papers). Knud Ib Christensen is often cited by papers focused on Botanical Studies and Applications (15 papers), Botany and Plant Ecology Studies (15 papers) and Horticultural and Viticultural Research (9 papers). Knud Ib Christensen collaborates with scholars based in Denmark, Canada and United Kingdom. Knud Ib Christensen's co-authors include Ghulam Hassan Dar, Timothy A. Dickinson, Eugenia Lo, Saša Stefanović, Jerzy Zieliński, G. H. Dar, Marten Sørensen, Hans V. Hansen, Nadia Talent and Mehdi Zarrei and has published in prestigious journals such as Molecular Phylogenetics and Evolution, Taxon and The Scientific World JOURNAL.

In The Last Decade

Knud Ib Christensen

31 papers receiving 418 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Knud Ib Christensen Denmark 12 356 187 128 67 53 32 473
María A. Negritto Chile 11 254 0.7× 314 1.7× 109 0.9× 56 0.8× 44 0.8× 45 453
Vlasta Jarolímová Czechia 13 424 1.2× 313 1.7× 196 1.5× 44 0.7× 35 0.7× 23 604
Robert P. Wagensommer Italy 13 325 0.9× 220 1.2× 99 0.8× 84 1.3× 23 0.4× 49 467
Carlos A. Lehnebach New Zealand 14 342 1.0× 490 2.6× 203 1.6× 99 1.5× 46 0.9× 35 606
Shi‐Kang Shen China 12 188 0.5× 115 0.6× 184 1.4× 53 0.8× 35 0.7× 51 362
Yong‐Mei Xia China 11 283 0.8× 196 1.0× 242 1.9× 76 1.1× 36 0.7× 19 571
Ewelina Klichowska Poland 11 224 0.6× 281 1.5× 106 0.8× 76 1.1× 18 0.3× 40 419
Zachary Larson‐Rabin China 8 281 0.8× 113 0.6× 274 2.1× 24 0.4× 33 0.6× 10 426
Heather L. Lindon United Kingdom 6 159 0.4× 169 0.9× 93 0.7× 58 0.9× 47 0.9× 9 314
G. Krüssmann United States 7 229 0.6× 168 0.9× 120 0.9× 47 0.7× 55 1.0× 12 388

Countries citing papers authored by Knud Ib Christensen

Since Specialization
Citations

This map shows the geographic impact of Knud Ib Christensen's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Knud Ib Christensen with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Knud Ib Christensen more than expected).

Fields of papers citing papers by Knud Ib Christensen

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Knud Ib Christensen. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Knud Ib Christensen. The network helps show where Knud Ib Christensen may publish in the future.

Co-authorship network of co-authors of Knud Ib Christensen

This figure shows the co-authorship network connecting the top 25 collaborators of Knud Ib Christensen. A scholar is included among the top collaborators of Knud Ib Christensen based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Knud Ib Christensen. Knud Ib Christensen is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Christensen, Knud Ib, et al.. (2014). Crataegus ×ninae-celottiae and C. ×cogswellii (Rosaceae, Maleae), two spontaneously formed intersectional nothospecies. PhytoKeys. 36(36). 1–26. 14 indexed citations
2.
Lo, Eugenia, Saša Stefanović, Knud Ib Christensen, & Timothy A. Dickinson. (2009). Evidence for genetic association between East Asian and western North American Crataegus L. (Rosaceae) and rapid divergence of the eastern North American lineages based on multiple DNA sequences. Molecular Phylogenetics and Evolution. 51(2). 157–168. 57 indexed citations
3.
Hansen, Hans V. & Knud Ib Christensen. (2009). The common chamomile and the scentless mayweed revisited. Taxon. 58(1). 261–264. 12 indexed citations
4.
Christensen, Knud Ib, et al.. (2009). A morphometric study of the Abies religiosa–hickelii–guatemalensis complex (Pinaceae) in Guatemala and Mexico. Plant Systematics and Evolution. 280(1-2). 59–76. 18 indexed citations
5.
Christensen, Knud Ib, et al.. (2006). Typification of specific and infraspecific names in Abies, Larix, Picea, and Pinus (Pinaceae). Feddes Repertorium. 117(7-8). 519–525. 3 indexed citations
6.
Christensen, Knud Ib & H. Aşkın Akpulat. (2004). Iris celikii (Iridaceae), a new species from north‐eastern Turkey. Nordic Journal of Botany. 24(2). 207–210. 4 indexed citations
7.
Dar, G. H. & Knud Ib Christensen. (2003). Gymnosperms of the Western Himalaya. 1. The genus Juniperus (Cupressaceae). Pakistan Journal of Botany. 35(3). 283–311. 7 indexed citations
8.
Christensen, Knud Ib & G. H. Dar. (2003). A MORPHOMETRIC STUDY OF HYBRIDIZATION BETWEEN PINUS MUGO AND P. SYLVESTRIS (PINACEAE). Acta Horticulturae. 211–221. 7 indexed citations
9.
Christensen, Knud Ib. (1999). Farjon, A. 1998. World Checklist and Bibliography of Conifers. Nordic Journal of Botany. 19(2). 148–148. 27 indexed citations
10.
Christensen, Knud Ib. (1998). Typification of some Maloideae (Rosaceae) commonly cultivated in Norden. Nordic Journal of Botany. 18(6). 701–703. 1 indexed citations
11.
Wißkirchen, Rolf, Knud Ib Christensen, W. Bernhard Dickoré, et al.. (1997). Notulae ad Floram Germanicam I. Feddes Repertorium. 108(1-2). 101–109. 8 indexed citations
12.
Wißkirchen, Rolf, Knud Ib Christensen, W. Bernhard Dickoré, et al.. (1997). Notulae ad Floram Germanicam I. Feddes Repertorium. 108(1-2). 101–109. 1 indexed citations
13.
Christensen, Knud Ib & Ghulam Hassan Dar. (1997). A morphometric analysis of spontaneous and artificial hybrids of Pinus mugo ×sylvestris (Pinaceae). Nordic Journal of Botany. 17(1). 77–86. 39 indexed citations
14.
Christensen, Knud Ib. (1993). Comments on the earliest validly published varietal name for the Corsican pine. Taxon. 42(3). 649–653. 6 indexed citations
15.
16.
Christensen, Knud Ib. (1987). A morphometric study of thePinus mugo Turra complex and its natural hybridization withP. sylvestris L. (Pinaceae). Feddes Repertorium. 98(11-12). 623–635. 1 indexed citations
17.
Christensen, Knud Ib. (1985). A taxonomic study of Crataegus Ser. Kyrtostylae Pojark. ex Botschantzev in Europe. Feddes Repertorium. 96(5-6). 363–385. 1 indexed citations
18.
Christensen, Knud Ib. (1985). JUNIPERUS COMMUNIS SUBSP. ALPINA (SMITH) ČELAKOVSKÝ (CUPRESSACEAE)—A NOMENCLATURAL COMMENT. Taxon. 34(4). 686–688. 4 indexed citations
19.
Christensen, Knud Ib. (1985). A taxonomic study ofCrataegus Ser.Kyrtostylae POJARK. ex BOTSCHANTZEV in Europe. Feddes Repertorium. 96(5-6). 363–385. 1 indexed citations
20.
Christensen, Knud Ib. (1984). The morphological variation of some Crataegus populations (Rosaceae) in Greece and Yugoslavia. Nordic Journal of Botany. 4(5). 585–595. 11 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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