2013 Envirothon
Simple leaf
having only a single blade
Compound Leaf
leaf having more than a single leaf blade
palmately compound leaf
compound leaf with leaflets radiating from a common point at the end of a stem or petiole, like the fingers on a hand
pinnately compound
compound leaf that has leaflets arranged on either side of the central main stem or petiole
opposite leaves
two leaves grow opposite each other at the same location or node
alternate leaves
a single leaf grows from its own location or node and the leaves alternate sides along the stem
whorled leaves
three or more leaves growing from a single location or node
leaf margin:
entire or smooth
the edge of the leaf is smooth
leaf margin:
wavy
the edge of the leaf is slightly curved
leaf margin:
lobed
the edge of the leaf is deeply or mildly indented; number of lobes vary
leaf margin:
serrate or toothed
the edge of the leaf is toothed; either finely or coarsely
leaf margin:
double serrate
the edge of the leaf is toothed with small teeth on larger teeth
leaf margin:
bristle tipped and lobe
the leaf edge is lobed in varied degrees and has hairlike tips
leaf veins:
parallel veins
major veins begin at the base, remain parallel and come together at the tip
leaf veins:
palmate veins
main vein begins from the base of the leaf like fingers on a hand
leaf veins:
pinnate veins
main veins extend from one large vein
leaf base: 4 types
rounded
heart-shaped
tapering
uneven
coniferous leaves:
needle-like
cluster or bundle
single
coniferous leaves:
scale like
scale like
Bud
a structure that will become a leaf flower or New shoot.
compound leaf
a leaf made up of two or more leaflets on the same petiole
coniferous
any cone bearing tree; usually with needles
deciduous
refers to trees that drop their leaves (broad leaf or needle)
evergreen
refers to trees that retain green leaves through the year; life span of individual leaf may be 2-15 years depending on species and environmental conditions
leaf blade
the broad, flat part of a leaf
leaflet
leaf-like part, or part of a compound leaf; no bud at the base of its petiole
node
the point on a shoot where the bud, leaf or flower is attached
petiole
leaf stalk
simple leaf
leaf that contains one blade
stem
primary structure that holds foliage and flowers
terminal leaflet
leaflet located furthest from the bud; typically only determined on a pinnately compound leaf
MAD HORSE
Maple/Ash/Dogwood: opposite leaf arrangements
HORSE chestnut is whorled
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