Overview
The Purple-veined Spider Orchid (Caladenia doutchiae) is a delicate and beautifully marked miniature spider orchid uniquely adapted to the semi-arid woodlands of the Western Australian wheatbelt. Recognized for its compact size, down-curved petals, and distinctively striped labellum adorned with fine crimson-purple radiating veins, it is a quintessential inland survivor.
Biology and Physical Characteristics
Caladenia doutchiae produces a narrow, hairy basal leaf that hugs the soil. In late winter and early spring (August to October), a wiry stem produces a solitary, charming flower. The sepals and petals are yellowish-green with red central stripes and terminate in short, club-like glandular tips. The heart-shaped labellum is cream or greenish-yellow, dominated by striking purple radiating veins and bordered by short, blunt teeth.
Behavior and Ecology
Adapted to drier inland climates, the Purple-veined Spider Orchid flowers rapidly following winter rains before intense desert heat sets in. It attracts male thynnid wasps through sexual deception, with glandular osmophores on the clubs emitting pheromone scents. After pollination, the flower quickly sets seed, and the plant retreats into dormancy as a desiccated capsule disperses seeds across bare red earth.
Conservation and Human Impact
Ranked as Least Concern, Caladenia doutchiae is widespread across the central and southern wheatbelt, occurring in protected woodland reserves such as Dryandra Woodland and Charles Gardner Nature Reserve. Habitat fragmentation and weed competition in small remnant bush patches remain ongoing management considerations.
Interesting Factoid
The radiating purple veins on the labellum act as optical nectar guides, leading deceived male wasps directly into alignment with the orchid’s pollen-bearing column.
Last updated: October 2026