Subdivision ofPelargonium sect.Cortusina (Geraniaceae) |
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Authors: | L L Dreyer F Albers J J A Van der Walt D E Marschewski |
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Institution: | (1) Department of Botany, University of Stellenbosch, 7600 Stellenbosch, Republic of South Africa;(2) Institut für Botanik, Westfälische Wilhelms-Universität, D-W-4400 Münster, Federal Republic of Germany |
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Abstract: | The sect.Cortusina (Dc.)Harv. s.l. is divided into the sectt.Cortusina (Dc.)Harv. s. str. andReniformia (Knuth)Dreyer, comb. nov.,P. cortusifolium
L'Hérit.,P. crassicaule
L'Hérit.,P. echinatum
Curt.,P. magenteum
J. J. A. Van der Walt, andP. sibthorpifolium
Harv. remain in the sect.Cortusina s. str., while the speciesP. album
J. J. A. Van der Walt,P. dichondrifolium
Dc.,P. odoratissimum (L.)L'Hérit.,P. reniforme
Curt., andP. sidoides
Dc. are removed from the sect.Cortusina s.l. and included in the revised sect.Reniformia. Both sections are well characterized by morphological, anatomical, karyological and palynological features. The chromosomes ofCortusina s. str. are small and based upon x = 11; those ofReniformia are larger and based upon x = 8. The size and surface sculpture of the pollen grains differ markedly between the two sections. Flavones and hydrolysable tannins occur in sect.Reniformia, but are absent in sect.Cortusina s. str. After hydrolysis hydroxybenzoic acids, which are present in large amounts inReniformia, occur only in traces inCortusina. The two sections also occupy distinctly different geographical areas. A close relationship between sect.Reniformia and some species of sect.Ligularia (Sweet)Harv. is indicated by the occurrence of artificial hybrids. |
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Keywords: | Geraniaceae Pelargonium sectt Cortusina andReniformia Morphology anatomy karyology palynology chemotaxonomy geographical distribution hybrids |
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