Day 26 Wednesday November 14, 2012
Fruits Dry and Don’t Split
1) Achene – only the base of seed (single) is attached to the pericarp
2) Grain (Caryopsis) embryo is united with the endosperm
- Corn, rice, wheat.
3) Nuts – resemble achenes but are larger
- Pericarp tends to be thicker.
- Bracts at their base
4) Schizocarp -twin fruit, which break into 2 segments upon dryland
5) Samaras – pericarp extends outwards in a “wing” shape
Ex. – Maple “keys”
- Multiple pistils – each develop a small fruit and mature at a cluster
- Ex. Strawberry, blackberry
- Develop into several individual flowers in an inflorescence
- Each flower is independent but they develop jointly resembling a single fruit.
- Ex. Pineapple
1) Maple – Samara caught by wind
2) Plumes – calyx is modified into a “feathery” appearance - dandelion
3) Minute - orchids
4) Wind blows – mature plant is severed from the root