Prasophyllum apoxychilum
Prasophyllum apoxychilum, commonly known as the tapered leek orchid, is a species of orchid endemic to Tasmania. It has a single tubular, green leaf with a purplish base and up to twenty light green and whitish flowers. It is very similar to P. truncatum, and there is some doubt as to whether the two species are distinct. The species is known from twenty widely separated populations and is usually only seen in disturbed sites, such as after fire.
Description
Prasophyllum apoxychilum is a terrestrial, perennial, deciduous, herb with an underground tuber and a single tube-shaped leaf, long and wide, the free part long. Between eight and twenty flowers are arranged along a flowering spike long reaching to a height of. The flowers are scented, light green, wide with whitish petals and a white labellum. As with others in the genus, the flowers are inverted so that the labellum is above the column rather than below it. The dorsal sepal is narrow egg-shaped to lance-shaped, long, about wide, turns downward and has a few dark stripes. The lateral sepals are linear to lance-shaped, long, about wide, slightly curved and spread apart from each other. The petals are a similar size to the lateral sepals or slightly shorter and have a dark central band. The labellum is long, about wide, turns upwards, sometimes reaching above the lateral sepals and has a wavy edge. Flowering occurs from October to December and is stimulated by disturbance, such as by fire or mowing.Taxonomy and naming
Prasophyllum apoxychilum was first formally described in 1998 by David Jones from a specimen collected near Murdunna and the description was published in Australian Orchid Research. The specific epithet derived from the Ancient Greek words apoxys meaning "tapering" and cheilos meaning "lip" referring to the pointed labellum.Prasophyllum apoxychilum is very similar to P. truncatum and the characteristics previously thought to distinguish them are variable within each.