HERBACEOUS STEMSAND

WOODY STEMSBy: Ivan Jeremy V. Guerrero

DifferentiationWOODY STEM

HERBACEOUS STEM

Primary tissues are formed in the early part of first season’s growth.

More primitive. Xylem and phloem

tissues contain same kind of cells.

Have developed in the course of evolution from woody types

Generally, secondary growth is lacking.

Xylem and phloem tissues contain same kind of cells.

WOODY STEM HERBACEOUS STEM Epidermis is similar. Cortex is thicker. Stele is composed of

pericycle, phloem, cambium, xylem rays and pith.

Gymnosperm Some angiosperm

Epidermis is similar. Cortex is thinner. Stele is composed of

primary phloem, cambium, primary xylem and pith.

Monocots angiosperm. Annual

WOODY STEM HERBACEOUS STEMS

Tough and not green Considerable growth

in diameter Tissues chiefly

secondary Chiefly perennial Covered by corky

bark Buds chiefly covered

by scales

Soft and green Little growth in

diameter Tissues chiefly

primary Chiefly annual Covered by

epidermis Buds chiefly naked