Per Ola Karis

817 total citations
30 papers, 577 citations indexed

About

Per Ola Karis is a scholar working on Ecology, Evolution, Behavior and Systematics, Plant Science and Cancer Research. According to data from OpenAlex, Per Ola Karis has authored 30 papers receiving a total of 577 indexed citations (citations by other indexed papers that have themselves been cited), including 23 papers in Ecology, Evolution, Behavior and Systematics, 21 papers in Plant Science and 16 papers in Cancer Research. Recurrent topics in Per Ola Karis's work include Plant Diversity and Evolution (20 papers), Sesquiterpenes and Asteraceae Studies (16 papers) and Plant and Fungal Species Descriptions (10 papers). Per Ola Karis is often cited by papers focused on Plant Diversity and Evolution (20 papers), Sesquiterpenes and Asteraceae Studies (16 papers) and Plant and Fungal Species Descriptions (10 papers). Per Ola Karis collaborates with scholars based in Sweden, United States and Italy. Per Ola Karis's co-authors include Simone Fior, Mari Källersjö, Kåre Bremer, Francesco Sala, Luigi Minuto, Gabriele Casazza, Arne A. Anderberg, Pia Eldenäs, Mark W. Chase and Sterling C. Keeley and has published in prestigious journals such as American Journal of Botany, Journal of Biogeography and Taxon.

In The Last Decade

Per Ola Karis

29 papers receiving 532 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Per Ola Karis Sweden 13 400 315 294 208 45 30 577
Raymund Chan United States 11 238 0.6× 217 0.7× 184 0.6× 175 0.8× 51 1.1× 17 402
Santiago Ortiz Spain 9 285 0.7× 301 1.0× 176 0.6× 139 0.7× 64 1.4× 82 507
Bertil Nordenstam Sweden 13 629 1.6× 474 1.5× 553 1.9× 282 1.4× 68 1.5× 60 930
Estrella Urtubey Argentina 13 334 0.8× 238 0.8× 204 0.7× 178 0.9× 27 0.6× 38 500
Eckhard Von Raab-Straube Germany 14 299 0.7× 313 1.0× 158 0.5× 92 0.4× 32 0.7× 34 479
Carolina M. Siniscalchi United States 13 393 1.0× 289 0.9× 342 1.2× 194 0.9× 51 1.1× 38 673
Tian‐Gang Gao China 13 468 1.2× 350 1.1× 489 1.7× 144 0.7× 57 1.3× 38 823
Benoît Loeuille Brazil 13 290 0.7× 194 0.6× 256 0.9× 202 1.0× 25 0.6× 60 471
Gerald Parolly Germany 16 640 1.6× 609 1.9× 100 0.3× 67 0.3× 38 0.8× 60 757
Víctor N. Suárez‐Santiago Spain 14 306 0.8× 382 1.2× 286 1.0× 166 0.8× 24 0.5× 35 595

Countries citing papers authored by Per Ola Karis

Since Specialization
Citations

This map shows the geographic impact of Per Ola Karis'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 Per Ola Karis with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Per Ola Karis more than expected).

Fields of papers citing papers by Per Ola Karis

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Per Ola Karis. 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 Per Ola Karis. The network helps show where Per Ola Karis may publish in the future.

Co-authorship network of co-authors of Per Ola Karis

This figure shows the co-authorship network connecting the top 25 collaborators of Per Ola Karis. A scholar is included among the top collaborators of Per Ola Karis 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 Per Ola Karis. Per Ola Karis 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.
Nylinder, Stephan, et al.. (2014). Evolution and diversification related to rainfall regimes: diversification patterns in the South African genus Metalasia (Asteraceae–Gnaphalieae). Journal of Biogeography. 42(1). 121–131. 9 indexed citations
2.
Anderberg, Arne A., et al.. (2012). Three new species of Metalasia (Asteraceae–Gnaphalieae) from the Western Cape and an updated key to the genus. South African Journal of Botany. 84. 72–82. 2 indexed citations
3.
Anderberg, Arne A., et al.. (2011). Phylogeny and Generic Delimitation of theMetalasiaClade (Asteraceae-Gnaphalieae). International Journal of Plant Sciences. 172(8). 1067–1075. 8 indexed citations
4.
5.
Funk, Vicki A. & Per Ola Karis. (2009). Heterolepis : an unplaced genus. 483–486. 1 indexed citations
6.
Karis, Per Ola, et al.. (2008). Metalasia helmei (Asteraceae-Gnaphalieae), a new member of a small clade from the Western Cape?. Bothalia. 38(1). 2 indexed citations
7.
Karis, Per Ola, et al.. (2008). ASTERACEAE-GNAPHALIEAE. Bothalia. 38(1). 65–88. 3 indexed citations
8.
Karis, Per Ola. (2007). Tribe Arctotideae Cass.. 223–229. 6 indexed citations
9.
10.
Fior, Simone, Per Ola Karis, Gabriele Casazza, Luigi Minuto, & Francesco Sala. (2006). Molecular phylogeny of the Caryophyllaceae (Caryophyllales) inferred from chloroplast matK and nuclear rDNA ITS sequences. American Journal of Botany. 93(3). 399–411. 133 indexed citations
11.
12.
Karis, Per Ola, Pia Eldenäs, & Mari Källersjö. (2001). NEW EVIDENCE FOR THE SYSTEMATIC POSITION OF GUNDELIA L.. 50(1). 105–114. 5 indexed citations
13.
Karis, Per Ola, Pia Eldenäs, & Mari Källersjö. (2001). New evidence for the systematic position of Gundelia L. with notes on delimitation of Arctoteae (Asteraceae). Taxon. 50(1). 105–114. 24 indexed citations
14.
Anderberg, Arne A. & Per Ola Karis. (1995). Psednotrichia, a genus of the tribe Senecioneae hitherto misplaced in the Astereae (Asteraceae). Nordic Journal of Botany. 15(4). 375–379. 2 indexed citations
15.
Karis, Per Ola. (1995). Cladistics of the Subtribe Ambrosiinae (Asteraceae: Heliantheae). Systematic Botany. 20(1). 40–40. 12 indexed citations
16.
Karis, Per Ola. (1994). Heliantheae sensu lato (Asteraceae), clades and classification. Plant Systematics and Evolution. 188(3-4). 139–195. 39 indexed citations
17.
Karis, Per Ola. (1993). Morphological phylogenetics of theAsteraceae-Asteroideae, with notes on character evolution. Plant Systematics and Evolution. 186(1-2). 69–93. 46 indexed citations
18.
Karis, Per Ola, Mari Källersjö, & Kåre Bremer. (1992). Phylogenetic Analysis of the Cichorioideae (Asteraceae), with Emphasis on the Mutisieae. Annals of the Missouri Botanical Garden. 79(2). 416–416. 76 indexed citations
19.
Bremer, Kåre, Robert K. Jansen, Per Ola Karis, et al.. (1992). A review of the phylogeny and classification of the Asteraceae. Nordic Journal of Botany. 12(2). 141–148. 42 indexed citations
20.
Karis, Per Ola. (1989). Systematics of the genus Metalasia (Asteraceae-Gnaphalieae). 15 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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