bottom, compared to the spherical shape that is more commonly seen in limes. It is also about wide in diameter, making it easier to distinguish against common limes which tend to be bigger in size. They also differ from other common citrus fruits by the amount of yellow oil that they possess, which can be seen from inside the vesicles of these fruits. Compared to other citruses such as the finger lime, Citrus australasica, or other Australian species of citrus, the vesicles differ in shape. Near the central axis of the Citrus australis, larger vesicles can be seen, which secretes the oil. In nature, citruses that have higher oil yields have larger leaves compared to those that have lower oil yields. For example, the Citrus australis was found to have an oil yield of 0.3-0.5%, and the Citrus glauca was found to have a yield of 0.6%. These both have a leaf size of about than 3 to 4 x 2 long. Conversely, the Citrus inodora has an oil yield of 0.1%, the Citrus garrawayi has an oil yield of 0.1-0.2%, and both have smaller leaves. Many of the citruses can also be distinguished from each other by the compositions of their essential oils. For example, the Citrus australis is the only species that has large amounts of a-piene. It also lacks limonene, which is most prevalent in the Citrus australasica and also contains only a small amount of germacrene D, germacrene B and bicyclogermacrene, which accounts for about 50% of the oil found in Citrus inodara. A further breakdown of the oils inside the leaves of the Citrus australis shows that it is composed of "a-pinene (68–80%), as well as P-pinene (2-4%), myrcene (3-5%), limonene (2-3%), p-phellandrene (1-2%), linalool(l-2%), bicyclogermacrene (1-4%), globulol (1-3%) and viridiflorol (3-5%)". Agroecology The Citrus australis can be found in southeast Queensland, especially from Brisbane northwards in the lowland sub-tropical rainforests. The lime's characteristics include growing slowly and needing protection, especially when the plant is still young. The thorns on the stems provide protection from wild animals. It is also preferable for the continued preservation of soil moisture to improve fertility of the species, and for health of the soil. This is also most required during dry seasons. Despite this, it is still considered to be a hardy plant, and will thrive during the winter, being moderately frost tolerant. The plant will be scattered most