, Volume 88, Issue 2, pp 233–237

Why vines have narrow stems: Histological trends in Bauhinia (Fabaceae)

  • Frank W. Ewers
  • Jack B. Fisher
Original Papers

DOI: 10.1007/BF00320816

Cite this article as:
Ewers, F.W. & Fisher, J.B. Oecologia (1991) 88: 233. doi:10.1007/BF00320816


Xylem (wood) tissue in plants functions both for mechanical support and water transport. Since vines are mechanical parasites, they allocate less biomass for xylem tissue than do free-standing trees or shrubs. With-in the genus Bauhinia, stems of vine species were found to have not only less xylem per distal leaf area, but also less phloem and cortical tissue when compared to tree and shrub species. The phloem and cortical reductions are interpreted as an indirect effect of the developmental/geometric constraints imposed by the evolution of a reduced mechanical system. Apparently vines overcame these constraints with the evolution of wider vessels and wider sieve tubes and with many types of variant (anomalous) secondary growth. The long and wide vessels of vines, which compensate hydraulically for the reduced xylem areas, may help limit the distribution of vine species in nature.

Key words

Anomalous growth Huber value Lianas Sieve tubes Translocation Vessels Xylem transport 

Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Frank W. Ewers
    • 1
  • Jack B. Fisher
    • 2
    • 3
  1. 1.Department of Botany and Plant PathologyMichigan State UniversityEast LansingUSA
  2. 2.Fairchild Tropical GardenMiamiUSA
  3. 3.Department of Biological SciencesFlorida International UniversityMiamiUSA

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