Prasophyllum are tuberous terrestrial herbs with a single cylindrical leaf resembling the leaves of an onion or leek. Flowers are borne in a spike that ruptures the leaf near its midpoint. Most species have pale greenish or cream flowers with a prominent, often crinkled or undulate labellum. The Tarengo Leek Orchid is a slender herb to 30 cm, its cylindrical leaf reaching 25 cm. A narrow flowering spike is produced in October to November, with 5 to 18 flowers distributed sparsely along it. Flowers are greenish to pinkish mauve, 5-7 mm across, and sweetly scented. Shiny green, obovoid capsules to 4 mm long are produced after flowering.
Tarengo Leek Orchid |
Status: Endangered on the EPBC Act list
Government evidence of impact of climate change:
Australian Government, Conservation Advice, Prasophyllum petilum
The species is also particularly vulnerable to climate change due to the small number of populations with fragmented localised distributions (DECCW 2010; ACT Government 2019).
Table 3 Threats impacting Tarengo Leek Orchid Threat Status and severity a Evidence Climate Change Increased temperature and Status current Climate change is a significant and persistent change to precipitation Confidence known change in the mean state of the climate and its patterns variability (CSIRO Bureau of Meteorology 2015).