F l o w e r sF l o w e r s

A f l o w e r i s :

A h i g h l y m o d i f i e d b r a n c h .

T h e f l o w e r p a r t s a r e m o d i f i e d l e a v e s .

A n o r g a n o f s e x u a l

r e p r o d u c t i o n .

S e p a l s—typically green in color

F i r s t p a r t g r o w i n g f r o m

r e c e p t a c l e .P r o t e c t s t h e d e v e l o p i n g f l o w e r i n t h e b u d .S e p a l s a r e “ n o n e s s e n t i

a l “. C a l y x - a l l t h e s e p a l s .

P e t a l s

A t t a c h e d j u s t i n s i d e t h e s e p a l s .

B r i g h t l y c o l o r e d t o a t t r a c t p o l l i n a t o r s .

P e t a l s a r e “ n o n e s s e n t i a l “.

C o r o l l a - a l l t h e p e t a l s .

P i s t i l : F e m a l e O r g a nS t i g m a - t h e o p e n

t o p o f t h e p i s t i l .• Why is it sticky?

S t y l e - t h e h o l l o w t u b e l e a d i n g t o t h e o v a r y .

O v a r y - develops into a fruit

O v u l e s - w h e r e e g g s a r e p r o d u c e d .

S t a m e n : M a l e O r g a n

A n t h e r P r o d u c e s

t h e p o l l e n .

What does pollen contain?

F i l a m e n tS u p p o r t s the a n t h e r .

Anther

Filament

Complete vs. Incomplete Flowers

Complete Flower—contains all 4 floral parts:

Incomplete Flower—lacks one or more of the 4 floral parts: petals, sepals, stamen, pistil

1. Petals

2. Sepals

3. Stamen

4. Pistil

Perfect vs. Imperfect

Perfect flower: flower that has both stamen and pistil; both male and female.

 

Imperfect flower: flower that lacks either a stamen or a pistil

1. staminate flower has a stamen but no pistila. is a flower

2. pistilate flower has a pistil but no stamena. is a flower female

male

P o l l i n a t i o n

T r a n s f e r o f p o l l e n f r o m a n a n t h e

r t o a s t i g m a .

S e l f - P o l l i n a t i o n : s a m e p l a n t .

C r o s s - P o l l i n a t i o n : d i f f e r e n t p l a n t s o f t h e s a m e s p e c i e s .

P o l l i n a t i o n

V e c t o r s o f P o l l i n a t i o n W i n d

A n i m a l s

Floral partsin multiples of 3

Floral partsin multiples of4s or 5s

Parallel veins

Fibrous/diffuseroots

Vascular tubesscattered, no pattern

taproot

2 cotyledonsOne cotyledon

Vascular tubes inring pattern

Stems

Roots

branched/netlike veins

Leaves

Flowers

Seeds

DicotsMonocotsAngiosperms:

Flower Review

pistil