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Types of vascular bundles

The document is a detailed analysis of various stem and vascular bundle types in plants, including sunflower, maize, cucurbita, fern rachis, and dracaena. It describes characteristics such as the arrangement of xylem and phloem, presence or absence of cambium, and the endarch/exarch orientation of xylem. The information provided serves as study material for understanding plant anatomy and vascular structure.

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Yusra M. Khatib Assistant Professor (Botany) K. M. E. Society’s G. M. Momin Women’s College
Types Study material Characteristics Conjoint, Collateral, and Open Sunflower stem Conjoint- Xylem and Phloem on same Axis Collateral - phloem on the outer side of the xylem towards the periphery. Open - cambium is present Origin of xylem is endarch - protoxylem towards the center and metaxylem towards the periphery Conjoint, Collateral, and Closed Maize stem Closed - cambium absent xylem is endarch ‘Y’ shaped Consists of two large metaxylem vessels and protoxylem consisting of annular and spiral vessels.
Types Study material Characteristics Conjoint, Bicollateral and open Cucurbita stem Bicollateral - Phloem on lateral side of xylem i.e. on both sides Endarch xylem Between the outer phloem and xylem is present outer cambium and between the xylem and inner phloem is present inner cambium.
Concentric Type Study material Characteristics Amphicribral or Hadrocentric Fern rachis 4 to 6 vascular bundles which are arranged in an arc. Some vascular bundles are large and some are small. xylem in the center and phloem surrounding it. Xylem is exarch - Metaxylem is in the center with protoxylem towards the periphery. Leptocentric or Amphivasal Dracaena stem Scattered Phloem is situated at the center of the vascular bundle and is surrounded by xylem.
Radial • Arranged alternately • xylem on one radius and phloem on the next radii • metaxylem is towards the center and the protoxylem towards the periphery. Thus, origin of xylem is exarch. • Maize roots. • Closed
Types of vascular bundles