Klackenberg, J. New species and combinations of Secamone (Apocynaceae, Secamonoideae) from South East Asia. - Blumea 55(3): 231-241.
2007
Klackenberg, J. & Meve, U. Pentopetia viridis Klack. & Meve (Apocynaceae, Periplocoideae), a new species from Madagascar. - Candollea 62(2): 211-214.
Klackenberg, J. New species of Baroniella and Pentopetia (Apocynaceae) from Madagascar. - Candollea 62(2): 231-236.
Lantz, H., Klackenberg, J., Razafimandimbison, S. & Mouly, A. Three new species of Vangueriae (Rubiaceae) from Madagascar. -Adansonia, sér. 3, 29(1): 129-136.
Klackenberg, J. Three new species of Calyptranthera (Apocynaceae, Secamonoideae) from Madagascar. - Adansonia, sér. 3, 29(1): 113-121.
Lahay, R., Klackenberg, J., Källersjö, M, Van Campo, E. & Civeyrel, L. Phylogenetic relationships between derived Apocynaceae s.l. and within Secamonoideae based on chloroplast sequences. - Ann. Missouri Bot. Gard. 94: 376-391.
2006
Klackenberg, J. Cotylanthera transferred to Exacum (Gentianaceae). - Bot. Jahrb. Syst. 126: 477-481.
Klackenberg, J. Four new species of Secamone (Apocynaceae, Secamonoideae) from Indonesia - Blumea 51(3): 587-597.
Wanntorp, L. & Klackenberg, J. Gunnera morae (Gunneraceae), a new species from Colombia. - Caldasia 28(2): 221-225.
2005
Klackenberg, J. Pervillaea brevirostris (Apocynaceae, Secamonoideae), a new species from Mauritius. - Bot. Jahrb. Syst. 126: 203-209.
Klackenberg, J. Secamone trichostemon Klack. (Apocynaceae, Secamonoideae), a new species from Madagscar. - Candollea 60: 119-122.
Yong-Ming Yuan, Wohlhauser, S. Möller, M., Klackenberg, J., Callmander, M. and Küpfer, Ph. Phylogeny and Biogeography of Exacum (Gentianaceae): A Disjunctive Distribution in the Indian Ocean Basin Resulted from Long Distance Dispersal and Extensive Radiation. - Syst. Biol. 54: 1-14.
2004
Klackenberg, J. A new species of Secamone (Apocynaceae, Secamonoideae) from Borneo. - Blumea 49: 129-133.
2003
Yong-Ming Yuan, Wohlhauser, S. Möller, M. Chassot, Ph., Mansion, G., Grant, J., Küpfer, Ph., and Klackenberg, J. Monophyly and relationships of the tribe Exaceae (Gentianaceae) inferred from nuclear ribosomal and chloroplast DNA sequences. - Mol. Phylogen. Evolution 28: 500-517.
Klackenberg, J. Secamone galinae (Apocynaceae), a new species from Madagascar. - Bot. Jahrb. Syst. 124: 421-425.
2002
Klackenberg, J.Baroniella collaris Klack. (Apocynaceae, Periplocoideae) a new species from Madagascar. - Candollea 57: 67-70.
Klackenberg, J. Secamone rubra (Apocynaceae, Secamonoideae), a new species from Madagascar. - Bot. Jahrb. Syst. 124: 49-54.
Struwe, L., Kadereit, J., Klackenberg, J., Nilsson, S., Thiv, M., von Hagen, K. B. and Albert, V. A. Systematics, character evolution, and biogeography of Gentianaceae, including a new tribal and subtribal classification. Pages 21-309 in: Struwe, L. and Albert, V. A. (eds.) Gentianaceae - Systematics and Natural History. Cambridge University Press.
2001
Klackenberg, J. Notes on Secamonoideae (Apocynaceae) in Africa. - Adansonia, sér. 3, 23: 317-335.
Klackenberg, J. Revision of the genus Cryptostegia R. Br. (Apocynaceae, Periplocoideae). - Adansonia, sér. 3, 23: 205-218.
Emanuelsson, E. & Klackenberg, J. The occurence of Endostemon viscosus (Lamiaceae) in Sri Lanka confirmed. - Kew Bull. 56: 999-1001.
2000
Jaederfeldt, K & Klackenberg, J. En lurig svamp - Astraeus hygrometricus (Pers.) Morgan. - Jordstjärnan 21(3): 49-51.
Klackenberg, J. 2000. Novelties in Secamone (Apocynaceae s.l., Secamonoideae) from western Madagascar. - Candollea 55(1): 75-85.
Klackenberg, J. Secamone brevicoronata and S. pedicellaris (Apocynaceae), two new species from Madagascar. - Willdenowia 30: 45-51.
Klackenberg, J. Calyptranthera schatziana (Apocynaceae s.l., Secamoneae), a new species from Madagascar. - Adansonia, ser. 3, 22 (1): 33-37.
Klackenberg, J. Two new species of Secamone (Apocynaceae, Secamoneae) from Madagascar - Novon 10(3): 215-219.
1999
Klackenberg, J. Revision of the Malagasy genera Pentopetia and Ischnolepis (Apocynaceae s.l., Periplocoideae). - Candollea 54(2): 257-339 Geneva.
1998
Klackenberg, J. Calyptranthera gautieri Klack. (Apocynaceae s.l., Secamoneae), a new species from Madagascar. - Candollea 53: 395-398. Geneva.
Klackenberg, J. Taxonomy and phylogeny of the genus Camptocarpus s.l. (Periplocoideae, Asclepiadaceae). - Bot. Jahrb. Syst. 120: 45-85.
Klackenberg, J. 1998. Secamone drepanoloba, a new species of Asclepiadaceae. - Bot. Jahrb. Syst. 120: 119-120.
1997
Klackenberg, J. & Civeyrel, L. A new species of Pentopetia (Asclepiadaceae) from Madagascar. - Adansonia, sér 3, 19 (2): 267-271.
Klackenberg, J. Secamone marsupiata Klack. (Asclepiadaceae, Secamonoideae), a new species from Madagascar. - Candollea 52: 301-304.
Klackenberg, J. Revision of the genus Baroniella Costantin & Gallaud (Asclepiadaceae, Periplocoideae). - Candollea 52: 383-407.
Klackenberg, J. Revision of the Malagasy genus Calyptranthera (Asclepiadaceae) - Adansonia ser. 3, 19(1): 21-37.
1996
Klackenberg, J. Revision of the Malagasy genus Pervillea (Asclepiadaceae) and its phylogenetic relationship to Calyptranthera. - Nord. J. Bot. 16(2): 165-184.
Civeyrel, L. & Klackenberg, J. A second species of the Madagascan genus Secamonopsis (Asclepiadaceae). - Novon 6(2); 144-146.
Klackenberg, J. The new genus Calyptranthera (Asclepiadaceae) from Madagascar. - Novon 6(1): 25-27.
1995
Klackenberg, J. Malagasy Asclepiadaceae: Reinstatement of the genus Pervillea and two new combinations. - Phytologia 78(3): 189-191.
Klackenberg, J. Taxonomy and phylogeny of the SE Asian genus Genianthus (Asclepiadaceae). - Bot. Jahrb. Syst. 117: 401-467.
1993
Klackenberg, J. Three new species of Genianthus (Asclepiadaceae) from Thailand. - Phytologia 75(3): 199-203.
1992
Klackenberg, J. Taxonomy of Secamone s. lat. (Asclepiadaceae) in the Madagascar Region. - Opera Botanica 112: 1-127.
Klackenberg, J. Taxonomy of Secamone s. str. (Asclepiadaceae) in Asia and Australia. - Kew Bull. 47(4): 595-612.
1990
Klackenberg, J. Flore de Madagascar et des Comores, fam. 168bis Menyanthacées, pp169-180. Paris. (Bound in one volume together with Gentianaceae).
Klackenberg, J. Flore de Madagascar et des Comores, fam. 168 Gentianacées, pp 1-167.
1988
Klackenberg, J. A new species of Bupleurum (Umbelliferae) from Sri Lanka. - Kew Bull. 43(1): 199-121.
1987
Klackenberg, J. A new species of Sebaea (Gentianaceae) from Madagascar. - Bull. Mus. natn. Hist. nat., Adansonia 2: 133-136.
Klackenberg, J. Revision of the genus Tachiadenus (Gentianaceae). Bull. Mus. natn. Hist. nat., Adansonia 1: 43-80.
1986
Klackenberg, J. Sebaea madagascariensis: a new name for a Malagasy Gentianaceae. - Taxon 35(3): 595.
Klackenberg, J. The new genus Ornichia from Madagascar. - Bull. Mus. natn. Hist. nat., Adansonia 2: 195-206.
1985
Klackenberg, J. The genus Exacum (Gentianaceae). - Opera Botanica 84: 1-144.
1983
Klackenberg, J. A reevaluation of the genus Exacum (Gentianaceae) in Ceylon. - Nord. J. Bot. 3: 355-370.
Klackenberg, J. 1983. The holarctic complex Potentilla fruticosa (Rosaceae). - Nord. J. Bot. 3: 181-191.