Leaf

Blade

flattened laminar portion

petiole

stack which attaches the blade to the stem

sessile

If the blade is attached directly to the stem, the leaf is described as _________

bud scales

Leaves arise from an apical or lateral bud that is often protected by _____________

Stipules

small leaf-like structures that develop in pairs on each side of the leaf during the growing season

sheath

In monocots, the blades are usually narrow whose base is a ___________ that wholly or partly encloses the stem.

auricles and ligules

Between the blade and the sheath, some monocot plants have appendages such as ______________________.

persistent meristem

There is usually a ________________ at the base of the leaf that allows it to grow indefinitely.

linear

thin shape

Lanceolate

spear-like shape

Ovate

oval shape

Cordate

shaped like a heart

midrib

the middle portion of the blade usually has a prominent central vein or ___________ while smaller veins radiate from this.

netted

Dicots display __________ venation

parallel

Monocots usually have __________ venation.

Margin

edge of the blade

Entire

having a smooth edge; not broken up into teeth or lobes

Toothed

having teeth especially of a certain number or type; often used in combination

Lobed

propel in a high arc

Apex

leaf tip

Leaf base

part near the petiole

Simple leaf

has a single blade or lamina

Compound

composed of two or more separate leaflets.

pinnately

the leaflets occur in a linear sequence lined up along both sides of a central axis, called the rachis

palmately

three, five, seven or more leaflets are all attached at one point near the tip of the petiole and they radiate out from this tip.

compound

If there is a bud in the angle formed by the petiole and stem, like an axillary bud, then the entire structure supported by the petiole is a ______________ leaf, regardless of the number of leaflets present.

Phyllotaxy

refers to leaf arrangement

Alternate or spiral arrangement

one leaf occurs at each node.

alternate distichous

the leaves occur only on two rows.

opposite

two leaves at a node facing each other.

opposite decussate

two opposite leaves are perpendicular to the two opposite leaves below or above them.

whorled arrangement

has three or more leaves at one node.

cuticle

These epidermal cells secrete a waxy substance which forms a covering over the outer dermal cells rendering these cells impermeable to water. The waxy covering is called

dorsiventral

There is an upper epidermis and a lower epidermis in a leaf with _________ orientation.

stomates

The openings in the epidermis are called

guard cells

The openings in the epidermis are called stomates which are formed between specialized epidermal cells called

trichomes

In many plants, ____________ (hairs) are found on the undersurface of the leaves and herbaceous stems. These help reduce evaporation of water from plants or protect young shoots from herbivores.

mesophyll

The ____________ tissue, with the exception of the vascular bundles, comprises all of the cells between the upper and lower epidermis and is usually divided into two parts.

palisade layer.

The cells toward the upper epidermis, which are elongated, make up the ________________

spongy layer

The zone below the palisade layer, composed of irregularly shaped cells is called the ______________.

isobilateral

In some monocots, there is no distinct palisade and spongy layers because the leaves are ________________

vascular bundles

function both as supporting and conducting tissue

Monocot

Monocot/Dicot: Leaves are typically longer and thinner

Dicot

Monocot/Dicot: Leaves are comparatively smaller and wider

Monocot

Monocot/Dicot: Attached directly to the stem (sessile)

Dicot

Monocot/Dicot: Connected through a petiole to the stem

Monocot

Monocot/Dicot: Isobilateral

Dicot

Monocot/Dicot: Dorsoventral

Monocot

Monocot/Dicot: Various sizes (small and large) and arranged complexly, has a vascular bundle that is covered by a sclerenchymatous bundle sheath.

Dicot

Monocot/Dicot: Large bundles and arranged in a ring, has a vascular bundle that is not wrapped in a bundle sheath

Monocot

Monocot/Dicot: Bulliform cells are present

Dicot

Monocot/Dicot: Bulliform cells are absent

Monocot

Monocot/Dicot: Stomates are amphistomatic

Dicot

Monocot/Dicot: Stomates are hypostomatic