Bush Citrus

Desert Lime (Citrus glauca) produces a small fruit with a very tart flavour. It can be used in place of regular limes or lemons, with the main differences being its small size and thinner peel. In fact, the Desert Lime requires no peeling and can be frozen without losing any flavour upon being thawed.
Native to arid and semi-arid zones of South Australia, New South Wales and Queensland, the Desert Lime plant has adapted to its harsh desert environment, possessing sharp thorns that protect it from grazing animals.
The fruit is yellowish when ripe but is often picked while still green. Desert Lime is used to make cordials, sauces, garnishes marmalades, pickles and chutneys. 

Australian Finger Lime (Citrus australasica) is a thorny shrub that occurs in the wild in south-eastern Queensland and northern New South Wales. Its cylindrical fruit is around 10 centimetres long and shaped, as its name suggests, like a finger.
The flesh comprises little caviar-shaped pearls. While fruits in the majority of wild plants have yellowish-green flesh, the stamp features a plant with naturally occurring pink-fleshed fruits. The fruit pulp is often used as a garnish, but Finger Lime can also be used in dressings, jams and sauces, cordials and even cocktails.

Lemon Aspen (Acronychia acidula) is a small to medium-sized rainforest tree, foundnaturally in coastal areas from central to northern Queensland. Its very small pale-yellow fruit (of around 1.5 to 2.5 centimetres in diameter) is referred toas “rainforest lemon”.
The flesh of the fruit is spongy and the core usually contains small black seeds. It has an extremely strong citrus aroma and is tart, much like grapefruit, and should be picked slightly under-ripe. Lemon Aspen puree can be used in dressings, marinades, cordials and desserts.