Question: I know I could just carry a bottle, but scavenging is much more fun. What is a good source of vitamin C in the wild? Have spruce needles really got enough?

Answer: 
[Pine needle tea](http://www.practicalprimitive.com/skillofthemonth/pineneedletea.html) is a good solution which is available year round in areas where pines grow. Do be careful to identify properly, and take care to not guzzle the stuff down... too much is bad for you. However this is the easiest to find and pine needle tea has a ton of vitamin C.

[Dandelion greens](http://en.wikipedia.org/wiki/Taraxacum#Culinary_use) are plentiful in many areas and good for vitamin C, though I detest the flavor.

[Chicory](http://en.wikipedia.org/wiki/Chicory) is a decent source, though I find it to be too easy to misidentify.
All types of berries are your answer here! Pretty much any (edible) variety contains a large amount of vitamin C - blueberries, strawberries, raspberries, blackberries for instance. (Blackberries and raspberries seem to be especially prevalent at the right time of the year here in the UK.) And they're tasty too.

Of course, it goes without saying if you're not 100% sure what a plant is then don't risk eating it.