Thelymitra antennifera (Lindl.) Hook.f.

Species Identity and Basic Morphology

Thelymitra antennifera (Lindl.) Hook.f. is a tuberous, perennial herb that grows 10–25 cm tall and produces yellow flowers between July and October. It has a single leaf that is circular in cross-section, measuring 5 to 12 cm long and 2 to 3 mm wide.

Inflorescence and Flower Characteristics

The inflorescence holds one to four yellow flowers on a wiry, zig-zagged, often pinkish stem. Each open flower is 20 to 40 mm across and carries a lemon or vanilla scent.

Sepal and Petal Morphology

Its sepals and petals are 12 to 20 mm long and 4 to 6 mm wide, with a broad, reddish-brown band on the outer surface of the sepals.

Reproductive Column Structure

The reproductive column is 5 to 6 mm long and 2 to 3 mm wide, with dark brown, ear-like arms that are held high above the column.

Reproductive Traits

Like other species in the genus Thelymitra, this species reproduces from seeds. It is unusual among the genus as one of the few species that develops tubers at the end of stolon-like roots, which lets it form new colonies.

Flowering and Pollination

Its flowers are insect pollinated, open easily even on cool days, and are long-lasting.

Geographic Distribution

This species occurs in the South-West and Eremaean botanical provinces of Western Australia, and is also found in South Australia and Victoria.

Tasmanian Conservation Status

In Tasmania, it only grows in a small number of small areas and is classified as an endangered species there.

Habitat and Population Traits

In all other parts of its range it is widespread and common, growing in a wide range of habitats, most often shrubland, heath and mallee. It sometimes forms dense, extensive colonies and flowers freely, particularly after fire.

Cultivation Potential

Species of the genus Thelymitra can be readily cultivated in pots.