Formation of tri-lobed stem and development of successive cambia in the stems of Argyreia hookeri C. B. Clarke (Convolvulaceae)

摘要

Highlights ? Development of successive cambia on 3 sides results tri-lobbed stem in A. hookeri. ? A unique pattern of vessel restriction is reported in genus Argyreia. ? Occurrence of tyloses in fibres is reported for the first time in literature. ? Intraxylary sieve elements are of two different diameters. Abstract Structural transformation of the xylem is a fundamental feature for the successful adaptation of climbing habit in plants. Therefo