Thelymitra uliginosa, commonly known as the southern curly locks, is a terrestrial orchid native to Australia. This species is a member of the Thelymitra genus, often referred to as sun orchids, which are characterized by their unique column structures and their tendency to open their flowers only in warm, sunny conditions. The southern curly locks is a relatively small orchid, typically reaching heights of 15 to 30 centimeters. Its growth habit is herbaceous and perennial, arising from a pair of underground tubers. The leaves are basal, usually solitary, and linear to lanceolate in shape, measuring between 5 to 15 centimeters in length and about 5 to 10 millimeters in width. They are often fleshy and can be somewhat channelled. The flowers of Thelymitra uliginosa are its most striking feature. They are typically borne in a loose raceme of two to seven individual blooms. Each flower is approximately 1.5 to 2 centimeters in diameter and exhibits a distinctive appearance. The petals and sepals are often a deep purplish-blue to violet, sometimes with darker or lighter veining. A key characteristic of this species, and indeed the genus, is the column, which is fused with the ovary and bears petal-like appendages. In Thelymitra uliginosa, these appendages are often described as being hooded and bearing a brush-like tuft of filaments, which gives rise to the common name "curly locks" due to their appearance. The flowers are resupinate, meaning they twist on their pedicel to present a more upright appearance. They are known to open fully only on warm, sunny, and calm days, a phenomenon common among sun orchids. The native distribution of Thelymitra uliginosa is primarily in the southern regions of Australia, including Tasmania and parts of Victoria and South Australia. It thrives in a variety of habitats, often found in damp, swampy, or seasonally wet areas, such as sedgelands, heaths, and damp clearings in woodlands. The specific epithet "uliginosa" itself refers to marshy or boggy conditions, highlighting its preferred environment. Cultivation of this species is challenging and typically requires replicating its specific habitat conditions, including well-drained but consistently moist soil, ample sunlight, and protection from frost. Ecologically, Thelymitra uliginosa plays a role in its native ecosystems as a pollinator attractant for specific insects, although detailed studies on its precise pollination biology are limited. Like other orchids, it relies on a symbiotic relationship with mycorrhizal fungi for germination and early growth. While not widely cultivated for ornamental purposes due to its specific needs and ephemeral flowering, it is of interest to native orchid enthusiasts and conservationists. There are no established agricultural, medicinal, or culinary uses documented for Thelymitra uliginosa. An interesting adaptation of this orchid, common to many terrestrial orchids, is its ability to survive unfavorable conditions, such as drought or cold, through its underground tubers, allowing it to regenerate when conditions become suitable.