Abstract
Cactus plants are mostly present in deserts and arid environments in which water limits plant growth. Tall species of columnar cacti may be particularly sensitive to water availability since for some tall species water must be transported several metres from roots to shoot terminals. The purpose of this study was to determine if there are any generalizations regarding vascular bundles, water conduits and xylem conductivity within terminal stem portions of 20 species of columnar cacti.
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