Overview
The King Sundew (Drosera regia) is widely revered by botanists as the undisputed monarch of the sundew family (Droseraceae). Endemic to a single, isolated mountain valley high in the Western Cape of South Africa, this colossal carnivorous perennial produces sword-like leaves that can reach two feet in length. Retaining ancient ancestral traits that distinguish it from all other living sundews, it represents an irreplaceable evolutionary relic of South Africa’s floristic heritage.
Biology and Physical Characteristics
Unlike most sundews that form low, compact rosettes, Drosera regia forms an enormous upright crown of arching, linear-lanceolate leaves densely lined with prominent stalked glandular tentacles. Each ruby-red tentacle is capped with a bead of sticky mucilage that glistens in the African sun like morning dew. When a large insect lands on the leaf, the tentacles exhibit rapid thigmonastic movement, curling inward within minutes to press the struggling prey against sessile digestive glands that flood the surface with proteases and esterases to dissolve insect tissues.
Behavior and Ecology
Drosera regia thrives in nutrient-leached, acidic peaty soils where vital nitrates and phosphates are virtually absent. Its massive leaf surface allows it to capture substantial prey, including large beetles, moths, and even dragonflies. The plant produces a deep, woody taproot that penetrates deep between quartzite sandstone boulders, enabling it to survive seasonal mountain droughts and resprout vigorously following periodic fynbos brushfires. In summer, it sends up tall, branched flower scapes bearing spectacular pink-to-purple blossoms.
Conservation and Human Impact
Drosera regia is listed as Vulnerable by the South African National Biodiversity Institute (SANBI) and faces critical conservation challenges. Because wild populations are confined to two small seepage sites spanning less than a few hundred square meters, the species is vulnerable to localized threats. Unseasonal wildfires, alien pine tree invasions that lower mountain water tables, and illicit wild-plant poaching have reduced the wild census to a few hundred mature individuals, prompting strict provincial legal protections.
Interesting Factoid
The King Sundew is the largest sundew in the world, producing giant two-foot-long sticky leaves powerful enough to entrap and digest heavy armored beetles and flying dragonflies.
Last updated: October 2026