Botany Department
 
 

Scientific articles

Zietsman, P.C. & Botha, F.C. 1987. Seed germination of Ziziphus mucronata subsp. mucronataSouth African Journal of Botany 53(5): 341-344.

Zietsman, P.C., Grobbelaar, N. & Van Rooyen, N. 1988. Soil nitrogenase activity of the Nylsvley Nature Reserve. South African Journal of Botany 54(1): 21-27.

Zietsman, P.C., Van Wyk, A.E. & Botha, F.C. 1989. Vegetative and reproductive phenology of Ziziphus mucronata subsp. mucronata (Rhamnaceae). South African Journal of Botany 55(6): 564-573.

Zietsman, P.C. 1990. Pollination of Ziziphus mucronata subsp. mucronata (Rhamnaceae). South African Journal of Botany 56(3): 350-355.

Du Preez, P.J. & Zietsman, P.C. 1991. A unique locality for Oleandra distenta, the first recorded for the Orange Free State. Bothalia 21: 65-66.

Zietsman, P.C. 1991. Reproductive biology of Grewia occidentalis L. (Tiliaceae). South African Journal of Botany 57(6): 348-351.

Zietsman, P.C. & Botha, F.C. 1991. Flowering of Ziziphus mucronata subsp. mucronata (Rhamnaceae): anthesis, pollination and protein synthesis. Bot. Bull. Academia Sinica 33: 33-42.

Zietsman, P.C., Du Preez, P.J. & Bezuidenhout, H. 1992. A preliminary checklist of flowering plants of the Vaalbos National Park. Koedoe 35: 1-10.

Zietsman, P.C. 1993. Pollination in Pelargonium dolomiticum Knuth (Geraniaceae). South African Journal of Botany 59(2): 259-264.

Zietsman, P.C. 1994. Autogamy in Sesamum triphyllum var. triphyllum (Pedaliaceae). Navors. Nas. Mus., Bloemfontein 10(15): 633-646.

Loubser, J. & Zietsman, P.C. 1994. Rock painting of postulated Brunsvigia sp. (Amaryllidaceae) at Thaba Bosiu, western Lesotho. S.A. Jnl. Science 90: 611-612.

Zietsman, P.C. 1998. Pollination Biology of Cotyledon orbiculata L. var. dactylopsis Toelken (Crassulaceae). Navors. Nas. Mus., Bloemfontein 14(4): 81-96.

Zietsman, P.C. & Bezuidenhout, H. 1999. Flowering plant biodiversity of Augrabies Falls National Park: a comparison between Augrabies Falls National Park, Kalahari Gemsbok National Park, Vaalbos National Park and Goegap Nature Reserve. Koedoe 42: 95-112.

Smith, G.F., Zietsman, P.C., Steyn, E.M.A. & Breuer, I. 2000. Distribution of Haworthia venosa subsp. tessellata in Southern Africa. Haworthiad. 40-43.

Eksteen, D., Pretorius, J.C., Niewoudt, T.D. & Zietsman, P.C. 2001. Mycelial growth inhibition of plant pathogenic fungi by extracts of South African plant species. Annals of Applied Biology 139: 243-249. 

Pretorius, J.C., Magama, S. & Zietsman, P.C. 2003. Growth inhibition of plant pathogenic bacteria and fungi by extracts from selected South African plant species. South African Journal of Botany 69(2): 186-192.

Magama, S., Pretorius, J.C. & Zietsman, P.C. 2003. Antimicrobial properties of extracts from Euclea crispa subsp. crispa (Ebenaceae) towards human pathogens. South African Journal of Botany 69(2): 193-198.

Pretorius, J.C., Magama, S. & Zietsman, P.C. 2003. Purification and identification of antibacterial compounds from Euclea crispa subsp. crispa (Ebenaceae) leaves. South African Journal of Botany 69(4): 579-586.

Zietsman, P.C. & Pelser, A. 2004. Sustainable harvesting of Devil’s Claw (Harpagophytum procumbens): A community based conservation approach. Navors. Nas. Mus., Bloemfontein 20(1):1-18.

Zietsman, P.C. Reproductive Biology of Stomatium mustellinum (Aizoaceae). Bothalia. In preparation.