TREE AND LEAF ID

TREE FACTS

Only 10% of virgin forest left in US

Arkansas originally had 33.6 million

acres of forest now 17.25 acres.

Arkansas’ first national forest est. 1909

OBJECTIVES Identify parts of a tree.

Identify 2 main types of trees.

Identify different characteristics of leaves.

WHY? Why do we need to know the parts of a

tree?

Why is it important to be able to know the different types of trees?

Why do we need to know the different characteristics of leaves?

WHAT? What are the parts of a tree?

What are the 2 main types of trees?

What are the different characteristics of leaves?

PARTS OF THE TREE

CROWN – FILTERS DUSK, CREATES SHADE (COOLING), FOOD FACTORY , RELEASES OXYGEN

ROOTS – ABSORB/STORES WATER AND NUTRIENTS, ANCHORAGE

TRUNK/STEM – SUPPORTS CROWN, AND GIVES TREE STRENGTH AND SUPPORT

HEARTWOOD – SUPPORT THE TREE (XYLEM CELLS BECOME INACTIVE AND DIE FORMING HEARTWOOD)

XYLEM/SAPWOOD – TISSUE THAT CARRIES WATER UP THE PLANT

CAMBIUM – THIN LAYER OF GROWING TISSUE B/W WOODY PART AND BARK. DIVISION OF CELLS RESULTS IN DIAMETER GROWTH.

PHLOEM (PART OF THE BARK) – CARRIES SAP FROM LEAVES TO REST OF TREE

BARK – DEAD PHLOEM CELLS THAT PROTECT THE TREES “ARMOR FOR THE TREE”

2 TYPES OF TREES Coniferous- type of tree that does lose

its leaves at different time of the year. (angiosperm)

Deciduous- type of tree will not lose its leaves or needles in the winter (gymnosperm)

Angiosperm- flowering plant

Gymnosperm- non-flowering plant

TREES ARE DIVIDED UP INTO 3 GROUPS 1. Broadleaf Trees – known for their autumn

color, bare branches in winter, and spring flowers, which can develop into fruit

2. Needle leaf Trees – have needlelike or scale like leaves and plain flowers that develop into cones. Most are evergreens.

3. Palms – with pandanus and lily trees, make up are group of mainly tropical trees. Most palms have huge leaves and no branches

BROADLEAF TREES Long growing season Plentiful rainfall “Hardwood forest” EX: Ash, Aspen, Beech, Birch,

Cottonwood, Elm, Hackberry, Live Oak, Maple, Myrtle, Oak, Sweet gum, Willow

BROADLEAF TREES

NEEDLE LEAF TREES Grow where there are long, cold winters Some needleleaf forests grow in

warmer areas = Southeastern U.S. “Softwood forests” EX: Pine, Cedar, Fir, Cypress, Juniper,

Spruce, Redwood

NEEDLE LEAF TREES

PALMS Grow in warmer areas.

LEAF CHARACTERISTICS

Leaf arrangement

Leaf Margins

Leaf shape

Leaf venation

LEAF ARRANGEMENT

Opposite

Alternate

Whorled

LEAF MARGINS Looking at the edge of the leaf

Serrated

Lobed

Smooth

LEAF SHAPES

Palmate

Linear

Cordate

Ovate

LEAF VENATION The distribution or arrangement of a

system of veins in a leaf. Parallel

Palmate

Pinnate

TERMS Blade/leaf- main photosynthesis organ of

most plants. Virgin forest- untouched forest usually old

growth Snag- standing dead trees Duff- blanket of twigs and needles left

after cutting Slash- limbs, treetops, and other waste

left after cutting

REVIEW What are the parts of a tree?

What are the 2 main types of trees?

What are the different characteristics of leaves?