F 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 n S 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 .

A n t h e r F i l a m e n t S t a m e n : M a l e O r g a n 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 t S 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 Petals Sepals Stamen 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 staminate flower has a stamen but no pistil a. is a flower 2. pistilate flower has a pistil but no stamen a. is a flower male female

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

Angiosperms: Monocots Dicots Seeds Flowers Leaves Roots Stems One cotyledon 2 cotyledons Flowers Floral parts in multiples of 4s or 5s Floral parts in multiples of 3 Leaves Parallel veins branched/ netlike veins Roots Fibrous/diffuse roots taproot Stems Vascular tubes scattered, no pattern Vascular tubes in ring pattern

Flower Review pistil