Lab 3 Worksheet.pdf - 1r Introductory Crop Science Dicot...

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1r
Introductory
Crop
Science
Dicot
Flower Structure
Lab Figure
3l
shows
a
typical dicot
flower. Using Figure
l0-l
on
page
l25as
a
guide, label the structures
in
Lab Figure &1.
/
Sepals: usually green, leaflike bracts or modified
leaves
that form the outermost
whorl
of
floral parts.
In
the bud
stage they
protect
the other parts from
injury.
The
collective
term for
all
the
sepals is the calyx.
Petals:
usually colorful
and fragrant to attract
insects.
Petals
are
located just within
the
calyx. Many
produce nectar
in specialized glands
near the
base.
The collective term for
all the petals is the corolla.
Stamens:
the
male
reproductive
organs
of
the plant.
The
collective term for
all the sta-
mens is the androecium.
Stamens in
dicot
flowers occur in multiples
of
four or five.
Each
stamen
has
two parts.
/ Rtament:
a
stalk
that supports
the
anther.
n/a,nttren
produces the pollen.
Pistil:
the
female
reproductive
organ of
a
plant.
If
there
is more
than
one
pistil,
they are
collectively
called the gynoecirrm. The
pistil
has three parts.
/
Sfrgmaz
located at the
tip
of the
pistil, it
is
designed
to attract and hold pollen.
y'
Styte:
a stalk-like
structure that
connects the stigma to the ovary.
'y'Onury,
contains the
egg
that
develops within the
ovule. The
ovule at maturity
'
becomes
a seed.
The ovary
can contain from
one
to
many
ovules.
Receptacle: the
base of
the flower located
just
below the calyx.
Pedicel:
a
branch from the peduncle. It supports
a
flower when
a
group
of flowers
is
present.
Peduncle:
a
stem
that supports
one
or more flowers. An example
is
the stem
betow
the
inflorescence
and above
the uppermost node in
a
plant.
The essential
flower
parts
are
the
stamens and
pistil,
and the accessory
flower parts
are the sepals
and
petals.
The
collective term for the
sepals and petals
is the
perianth.
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