The small white flowers of Drosera allantostigma reveal more than their colour. Their dark, curved stigmas, long individual flower stalks and changing posture in fruit help distinguish a plant that once sat within a broad D. nitidula treatment. It is also a useful example of why “pygmy sundew” does not imply an identical summer routine for every species.
Name and distinguishing features
Kew accepts Drosera allantostigma (N.G.Marchant & Lowrie) Lowrie & Conran. Its former names include D. nitidula subsp. allantostigma and the corresponding variety. The present combination dates from the 2007 revision of the D. omissa–D. nitidula complex. Kew name and synonym record.
The revision describes rosettes 10–20 mm across, with younger leaves held more upright and older leaves spreading. In the flowers, the maroon stigmas have a curved, sausage-like form. Long pedicels become pendent in fruit. The combination helps separate this species from other small white-flowered pygmies. Lowrie and Conran's original revision.
A photograph made only during flowering misses part of that comparison. Include a later image of the fruiting stalks as well as a close-up of the open flower. Record the original received name so that an old subspecies label can be traced after the identification is updated.
Habitat and an important seasonal exception
The 2007 treatment describes plants beside winter-wet depressions in sandy, peaty or loamy substrates. It notes that complete dormancy is uncommon unless drought is prolonged, with growth continuing slowly into dry months when moisture remains deeper in the soil.
That observation is especially relevant in pots. Applying an obligatory bone-dry rest because the plant is a pygmy sundew can remove the moisture that the field account identifies as important. The appropriate response to slower growth is to examine the crown and root-zone conditions, not to follow a group slogan.
The Singapore National Parks Board's cultivation entry likewise recommends consistently moist, acidic, nutrient-poor media, giving an equal sand-and-peat mixture as one example. It lists bright exposure and a miniature rosette habit. This is a horticultural recommendation, not evidence that the same mixture will behave identically in every climate or container. NParks species account.
Maintaining a small plant
The scale of the rosette changes routine maintenance. Moss and neighbouring plants can obscure the centre before the problem is obvious from a distance. Inspect at the plant's level and remove competing growth carefully, without pulling on the sundew's roots.
A deep enough pot and a stable surface are more useful than repeatedly rearranging the plants for appearance. Avoid digging around a healthy rosette to look for a storage organ: this is a fibrous-rooted pygmy sundew, and its seasonal crown should not be confused with an Australian tuberous species.
If feeding is needed, use actively dewy leaves and very small portions. Keep the food away from the compact growing centre. A persistent residue is a reason to reduce the amount and reassess conditions, not to assume that more food will accelerate recovery.
Propagation and accurate labels
Gemmae are documented in the taxonomic treatment. They provide a way to multiply a known accession, but every resulting plant retains the same identification history and usually the same genotype as its source. A large number of clonal pots is not equivalent to a large number of unrelated plants.
The ICPS guide explains why fresh gemmae and careful placement matter, and warns that movement between pots can produce mislabelling. Keep batches separate and check later flowers against the expected characters. ICPS pygmy propagation guidance.
NParks also lists seed as a propagation route. That does not establish that a lone plant automatically self-pollinates. Retain parentage information for seed batches, especially where other pygmy species flower nearby.
A conservation account that needs dates
A 2020 conservation paper reported unsuccessful searches at a known site in 2019 and 2020 and raised the possibility of extinction in the wild. That was an alarming, qualified report; it should not be rewritten as a confirmed current extinction declaration. Cross and colleagues, 2020.
A cultivated plant can still be an important living record even when its wild status is unresolved. Keep its provenance, photographs and propagation history together. Avoid implying that commercial availability demonstrates security in nature.
Read this species beside D. nitidula, D. leucostigma, D. omissa and D. patens. The comparison explains both the taxonomic changes and the value of looking beyond rosette size to the flower and fruit.
Nano Nursery Drosera Encyclopedia — species profile. Related core chapters: 16, 17 and 29. Reviewed 23 September 2026. Cultivation guidance concerns established plants; recently deflasked plants need separate acclimatisation.
