LEAVES

• solar energy

• CO2 collector

function of leaves

• opposite

• alternate

• basal

• whorled

different phyllotaxy of leaves

simple leaf

undivided blade with single axillary bud

pinnate compound leaves

pair of leaflets attached to rachis

palmate compound leaves

leaflets attached at same point

peltate

petioles attached to the middle of blade

perfoliate

sessile leaves pierced by stems

netted venation

contains a main vein called midrib and minor veins

• pinnate netted venation

• palmate netted venation

• parallel venation

• dichotomous venation

types of venation

• tendrils

• spines

• storage

• petal-like

• insect-trapping

• phyllodes

modifications of leaves

tendrils

modified for clinging and climbing

spine

stiff rigid structure with sharp point

storage

retain water in large vacuoles

petal-like

“bracts”

insect-trapping

lives in nutrient poor conditions

phyllodes

modified petioles and leaf stems