Plant Systematics and Evolution

, Volume 216, Issue 1–2, pp 49–68 | Cite as

Investigation and documentation of hybridization betweenParkinsonia aculeata andCercidium praecox (Leguminosae:Caesalpinioideae)

  • Julie A. Hawkins
  • Laura White Olascoaga
  • Colin E. Hughes
  • José-Luis R. Contreras Jiménez
  • Pedro Mercado Ruaro


Morphometric, cytogenetic, geographical and ecological evidence for hybridization betweenParkinsonia aculeata andCercidium praecox is presented. Morphometric investigation using the character count procedure and cytogenetic observations confirm hybrid status. All diagnostic morphometric characters were intermediate in the hybrid. Both parents (2n = 28) show regular tetrad formation and pollen fertility greater than 94%. Hybrids have a chromosome number of 2n = 28 or 2n = 30, and display meiotic abnormalities including lagging chromosomes and micronucleus formation; less than 21% of hybrid pollen was fertile. Ecological and geographical information suggests that hybridization is occurring at increasing frequency due to the expanding range ofP. aculeata associated with cultivation as an ornamental, coupled with ecological disturbance and weediness, and the cultivation ofC. praecox and hybrids as fodder, ornamental and shade trees. Hybrid fertility and phenological observations, in conjunction with F-weighted principal component analysis, suggest that the progeny of F1 hybrids are established. The hybrid is formally described asP. ×carterae.

Key words

Leguminosae Parkinsonia aculeata Cercidium praecox Parkinsonia ×carterae Hybridization morphometric analysis cytology weeds 


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Copyright information

© Springer-Verlag 1999

Authors and Affiliations

  • Julie A. Hawkins
    • 1
  • Laura White Olascoaga
    • 3
  • Colin E. Hughes
    • 1
  • José-Luis R. Contreras Jiménez
    • 2
  • Pedro Mercado Ruaro
    • 3
  1. 1.Department of Plant SciencesUniversity of OxfordOxfordUK
  2. 2.Herbario de la Benemerita Universidad Autónomia de Puebla (HUAP)Puebla Pue.Mexico
  3. 3.Instituto de BiologíaUniversidad Nacional Autónoma de MéxicoDelegación CoyoacánMexico

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