Find the trees

[kimbo]

From the following clues can anyone help me find the name of the trees:

1. Are its branches aerodynamic?  (5)

2. Its wood needs to be thick or you may miss it? (7)

3. Just a little carbon said to be in this tree? (6)

4. A happy camper rested in its shade (8)

Good luck!

[SteveD]

1. Will be Plane.

[AlFas]

4. Coolabah

Once a jolly swagman camped by a Billabong
Under the shade of a Coolabah tree
And he sang as he watched and waited till his billy boiled
"Who'll come a-waltzing Matilda with me?"

[Huldrekat]

3 is Ash

[Huldrekat]

3. is Ash (sorry if this appears twice - tried to submit it before and nothing happened)

[FP]

3.  Carob (taken from the word carbon)

[FP]

2.  Spindle Tree ?

[FP]

Whoops sorry, Carob is only five letters.

[Octavius]

3.  Just a little carbon said to be in this tree

bonsai?

[kimbo]

Thanks everyone so far, good answers. Bonsai - excellent spotting