About

Drosera regia, commonly known as the king sundew, is a carnivorous plant in the sundew genus Drosera that is endemic to a single valley in South Africa. Individual leaves can reach 70 cm (28 in) in length. It has many unusual relict characteristics not found in most other Drosera species, including woody rhizomes, operculate pollen, and the lack of circinate vernation in scape growth. All of these factors, combined with molecular data from phylogenetic analysis, contribute to the evidence that D. regia possesses some of the most ancient characteristics within the genus. Some of these are shared with the related Venus flytrap (Dionaea muscipula), which suggests a close evolutionary relationship.

The tentacle-covered leaves can capture large prey, such as beetles, moths, and butterflies.

How to grow it

Drosera regia cultivation was first attempted prior to the formal description of the species in 1926. The author, Edith Layard Stephens, reported the successful cultivation of D. regia, noting that such success required "a moist and comparatively cool atmosphere", similar to that of its native environment.

Drosera regia is often described as being a difficult species to cultivate, though modern reports on its cultivation have indicated which conditions have led to success for some. For optimal growth, D. regia appears to require good soil drainage and sufficient light levels, and prefers cooler temperatures. Cool nights and warm days have been reported to induce vigorous growth. Asexual propagation is frequently achieved through small root cuttings instead of leaf cuttings, which tend to rot before roots can form. Seed germination occurs as early as 10 days to 3 or 4 weeks with fresh seed, faster than many other Drosera species. Germination is phanerocotylar (non-glandular cotyledons exposed, free from seed coverings), with the first true leaves being alternate in arrangement.

Where it grows

Drosera regia is endemic to South Africa and has only ever been found at two sites at elevations of 500 and 900 m (1,600 and 3,000 ft) in the Bainskloof Range near Wellington, Western Cape in South Africa. Despite extensive exploration, D. regia has not been found at any similar location in neighbouring valleys. Small morphological variations such as broader leaves have been recorded from these two small populations, which are restricted to an area of just a few hundred square meters. Drosera regia is found in a natural fynbos vegetation amongst dense marshy grasses. The fynbos habitat is similar to a low or medium shrubland or heathland, dominated by low evergreen shrubs.

Other Drosera plants

Scented Sundew · Drosera acaulis · Drosera adelae · Peninsula Sundew · Slender Leaved Sundew · White Sundew · Drosera albonotata · Australian sundew · Pygmy Sundew · Drosera amazonica · Drosera andersoniana · Drosera androsacea