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Plant Systematics and Evolution

, Volume 183, Issue 1–2, pp 83–97 | Cite as

Subdivision ofPelargonium sect.Cortusina (Geraniaceae)

  • L. L. Dreyer
  • F. Albers
  • J. J. A. Van der Walt
  • D. E. Marschewski
Article

Abstract

The sect.Cortusina (Dc.)Harv. s.l. is divided into the sectt.Cortusina (Dc.)Harv. s. str. andReniformia (Knuth)Dreyer, comb. nov.,P. cortusifoliumL'Hérit.,P. crassicauleL'Hérit.,P. echinatumCurt.,P. magenteumJ. J. A. Van der Walt, andP. sibthorpifoliumHarv. remain in the sect.Cortusina s. str., while the speciesP. albumJ. J. A. Van der Walt,P. dichondrifoliumDc.,P. odoratissimum (L.)L'Hérit.,P. reniformeCurt., andP. sidoidesDc. 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.

Key words

Geraniaceae Pelargonium sectt.Cortusina andReniformia Morphology anatomy karyology palynology chemotaxonomy geographical distribution hybrids 

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • L. L. Dreyer
    • 1
  • F. Albers
    • 2
  • J. J. A. Van der Walt
    • 1
  • D. E. Marschewski
    • 2
  1. 1.Department of BotanyUniversity of StellenboschStellenboschRepublic of South Africa
  2. 2.Institut für BotanikWestfälische Wilhelms-UniversitätMünsterFederal Republic of Germany

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