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Leaf Identification Topic 2014A and 2014 D Amanda Trutsch. Monocot Embryo with single cotyledon Flower parts in multiples of three Major leaf veins parallel. Dicots Embryo with two cotyledons Flower parts in multiples of four or five Major leaf veins reticulated (net venation).

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Presentation Transcript
slide1

Leaf Identification

Topic 2014A and 2014 D

Amanda Trutsch

characteristics of
Monocot

Embryo with single cotyledon

Flower parts in multiples of three

Major leaf veins parallel

Dicots

Embryo with two cotyledons

Flower parts in multiples of four or five

Major leaf veins reticulated (net venation)

Characteristics of:
monocot
Monocot

http://www.ipm.iastate.edu/images/plantpath/corn/grayleafspot/0093.8grayleafspot.gif

http://www.emc.maricopa.edu/faculty/farabee/BIOBK/monocot_flower.gif

http://www.birdhybrids.com/resources/cornSeed.jpg

dicot
Dicot

http://gecko.gc.maricopa.edu/~lsola/Flower/hibisc.jpg

http://web.vet.cornell.edu/

http://www.harcourtschool.com/glossary/science/images/gr6/dicot6.jpg

types of leaves
Broadleaf

Broad, flat leaf

Also called hardwoods

Many are decidious

Ex: maple, oak, birch

Conifer

Needle-shaped or scale-like leaves

Also called softwood

Ex: White pine, juniper, yew

Types of Leaves
slide6
Broadleaf

Conifer

http://www.istockphoto.com

http://ridge.icu.ac.jp/gen-ed/lower-plants-gifs/23f-conifer-parts.JPG

characteristics to look for
Characteristics to look for:
  • Leaf arrangement
  • Leaf composition
  • Overall shape
  • Leaf tip
  • Leaf margin
  • Leaf base
leaf arrangement on stem
Leaf Arrangement on Stem

Alternate Opposite Whorled

Three or more leaves

attached to a

single node

Two leaves attached to

the same node

One leaf attached to a node

http://users.scc.spokane.edu/PShaw/morph/tippick.htm

leaf composition
Simple

Compound

Leaf Composition

A leaf with only one

leaf blade area

A leaf with more than

one leaf blade area

http://users.scc.spokane.edu/PShaw/morph/tippick.htm

types of compound leaves
Types of Compound Leaves

Pinnate Compound Palmate Compound

A leaf with multiple leaf

blade areas where the leaflets

are attached to a common point

Leaflets arranged along

a central axis like a feather

http://users.scc.spokane.edu/PShaw/morph/tippick.htm

types of compound leaves cont
Types of Compound Leaves, cont.

Bipinnate Compound Trifoliate

A compound pinnate leaf.

The leaflets of a pinnate leaf

are themselves compound.

Three leaflets. The leaflets of a trifoliate

leaf appear to be attached to a single

location but maybe a reduced pinnate

compound leaf.

http://users.scc.spokane.edu/PShaw/morph/tippick.htm

some leaf shapes
Some Leaf Shapes:

Ovate:egg-shaped, about twice as

long as it is wide, with the

widest part below the center

Elliptical:a narrow oval with the

widest part in the middle

of the leaf

Linear:very long and narrow, slightly

wider at the lower half

Obovate:egg-shaped, with the

widest part of the leaf

above the center

Obcordate:heart-shaped leaf attached

at the narrow end (the

opposite of cordate)

http://users.scc.spokane.edu/PShaw/morph/tippick.htm

leaf margins
Leaf Margins

Crenate:rounded teeth

perpendicular to

the margin

Entire:not toothed or

notched

Doubly Serrate:forward-facing teeth

that have smaller teeth

Serrate:forward-facing

teeth

Serrulate:margins with small

forward-facing teeth

http://users.scc.spokane.edu/PShaw/morph/tippick.htm

leaf margins cont
Leaf Margins, cont.

Incised:cut by sharp,

irregular incisions

Dentate:teeth pointing

perpendicular

to the margin of

the leaf

Sinuate:with a strongly

wavy margin

Lobed:margins with rounded

teeth nearly halfway to

the midrib

Undulate:margins wavy,

up and down

http://users.scc.spokane.edu/PShaw/morph/tippick.htm

leaf tips
Leaf Tips

Acuminate:Terminating into a

long drawn out point.

Acute:Tip with sides having

an angle of less than

90 degrees.

Truncate:Cut off flat at the tip,

may sometimes be

slightly indented.

Obcordate:Heart-shaped tip.

http://users.scc.spokane.edu/PShaw/morph/tippick.htm

leaf tips cont
Leaf Tips, cont.

Emarginate:With a small

notch at the apex.

Mucronate:Tipped with a short,

sharp point.

Obtuse:Sides with an

angle greater than

90 degrees

Rounded:Apex rounded.

http://users.scc.spokane.edu/PShaw/morph/tippick.htm

leaf bases
Leaf Bases

Cuneate:narrow wedge shaped

Auriculate:ear lobe like base

Rounded:round base

http://users.scc.spokane.edu/PShaw/morph/tippick.htm

leaf bases cont
Leaf Bases, cont.

Cordate:heart shaped

Truncate:cut off at the base

Oblique:unequal base sides

http://users.scc.spokane.edu/PShaw/morph/tippick.htm

needle types
Needle Types
  • Needles in bundles or clusters
    • Two or more needles joined at base
    • Ex. White pine, jack pine, larch

http://www.isaontario.com/media/news_letter/spec_focus/JackPine.jpg

http://www-saps.plantsci.cam.ac.uk/trees/images/leaves/28.jpg

needle types1
Needle Types
  • Needles in Singles
    • Each needle growing singly on a twig
    • Ex. Douglas fur, hemlock, blue spruce

http://ridge.icu.ac.jp/gen-ed/lower-plants-gifs/23f-conifer-parts.JPG

needle types2
Needle Types
  • Overlapping scales
    • Leaves shaped like overlapping plates (like fish scales)
    • Ex. Juniper, cedar, cypress

http://preservedgardens.com/images/pressed-foliage/Juniper.JPG

http://www.buenavistatownship.org/Photos/Atlantic%20white%20cedar%20leaf.jpg