How much do you know about citrus fruit?

So it's been decided. This week's Friday Challenge in our office shall be 'Know your citrus fruits: identification according to texture, taste, colour and peelability'. Whoever wins will be crowned the King (or Queen) of Fruit... Until the potato challenge on the 28th anyway.

Edit: Revised poll - I can't type and Livejournal is stupid and won't work properly!
( Can you beat the Curious Orange? )