Overview
The Scented Mignonette Orchid (Microtis alboviridis) is a charming, slender terrestrial orchid native to the seasonally moist landscapes of southwest Western Australia. Distinct among the mignonette orchids for the delightful, sweet honey perfume emitted by its compact cylindrical spike of miniature whitish-green blossoms, this resilient geophyte forms expansive colonies in damp wetland margins.
Biology and Physical Characteristics
Microtis alboviridis emerges with a single hollow, onion-like cylindrical leaf through which the flower spike bursts in late spring. From October to December, the spike bears up to 50 densely packed, tiny, inverted flowers. The perianth is a translucent pale green to cream-white, featuring an oblong, down-curved labellum with finely crisped or wavy margins and two prominent basal calli that gleam with sweet aromatic nectar.
Behavior and Ecology
Unlike sexually deceptive orchids, Microtis alboviridis provides a genuine nectar reward to generalist pollinators, including small hoverflies, native solitary bees, and ants. On warm afternoons, a colony of hundreds of flowering stems saturates the air with an intoxicating sweet honey scent. As the seasonal wetlands dry out in early summer, the seeds ripen quickly, and the hollow leaf desiccates to conserve tuber resources underground.
Conservation and Human Impact
Ranked as Least Concern, the Scented Mignonette Orchid is secure across its distribution, thriving in damp conservation reserves, roadside ditches, and granite catchment buffers. Protection of seasonal wetland hydrology and control of aggressive pasture grasses are key to sustaining healthy populations.
Interesting Factoid
A single flower of the Scented Mignonette Orchid measures barely 3 millimeters across, yet a dense colony of spikes can fill an entire woodland depression with the scent of wild clover honey.
Last updated: October 2026