Transcript vegetative organs - NWIC Blogs

Welcome to Northwest Plants
Northwest Indian
College
ENVS 201 Spring Quarter 2012
Plant Parts
vegetative
organs:
reproductive
components:
stems
flowers
roots
fruits
leaves
seeds
Today:
Flowers
Flower Features &
Functions
involved in sexual reproduction of flowering plants
(angiosperms)
produce fruits & seeds (following pollination and
fertilization)
may be self-pollinating or pollinated by various
organisms
vary little; primary basis for identification &
classification
lily magnolia (Magnolia soulangiana) flower, l.s.
(magnoliid)
Flower Components—
Fertile, Male
stamen - male reproductive structure
filament - slender stalk-like structure
anther - region of pollen sacs
Flower Components—
Fertile, Female
pistil - female reproductive structure
stigma - region at tip of style that receives pollen
style - stalk of the pistil
ovary - swollen base of pistil, becomes fruit
snapdragon (Antirrhinum majus)
inflorescence
snapdragon (Antirrhinum majus) flower, l.s. (eudicot)
Flower Components—
Sterile (Auxiliary
Structures)
sepal - one of the elements in the outermost
whorl
petal - one of the elements of the whorl
inside the sepals (may attract pollinators)
tepal - petal and sepal, if indistinguishable
from one another (e.g., lilies)
receptacle - base where petals, etc. attached
lily (Lilium) flower
lily (Lilium) life cycle (monocot)
Other Flower Terms
complete - flower with all four floral parts (sepals,
petals, stamens & pistils)
incomplete - flower lacking one or more parts
perfect - flower with male & female parts; pollen &
ovules produced
imperfect - flower lacking stamens or pistils; pollen
or ovules not produced
Flower Terms
(continued)
peduncle - stalk of an inflorescence or of a
solitary flower
pedicel - stalk of an individual flower in an
inflorescence (or of a grass spikelet)
Flower Terms
(continued)
dioecious, dioicous -”two houses,” plant species with
separate male & female plants; male & female
flowers on separate plants (imperfect, unisexual
flowers)
monoecious -”one house” (with two rooms), plant
species with both male & female flowers on same
plant; both types of imperfect, unisexual flowers on
same plant
Flower Terms
(continued)
regular (syn. actinomorphic) - flowers which are
radially symmetrical (capable of being bisected
into identical halves from any longitudinal cut
(e.g., lily)
irregular (syn. zygoomorphic) - flowers which are
bilaterally symmetrical, only capable of being
bisected in one plane to produce equal halves (e.g.,
snapdragon)
Ovary Position
epigynous, epigyny - describes a flower which has an
inferior ovary, with the sepals, petals and stamens
attached at or above the top of the ovary
hypogynous, hypogeny - flower parts attached below the
base of the ovary and free from it; flowers with this
arrangement have a superior ovary
perigynous, perigyny - borne around the gynoecium;
floral parts (calyx, corolla and stamens) are attached
to the edge of a cup-shaped hypanthium
Flowers &
Inflorescences
solitary - plant with a single flower per stalk
inflorescence - flowers grouped together in
clusters of more than one flower
Questions &
Comments?
Flowers are cool.
Hy’shqe!