Nano Nursery · Rare Carnivorous Plant Encyclopedia
The flowering stem of Genlisea glandulosissima is densely clothed in gland-tipped hairs, but its carnivorous structures lie below the rosette. This African corkscrew plant is especially interesting because observations extend from its wetland setting to differences in trap form and measurements of its chromosomes and DNA. Its published range also deserves a closer look than a single map can provide.
Name and a range that needs attribution
Kew accepts Genlisea glandulosissima R.E.Fr., first published in 1916, and lists a native range from southwestern Tanzania to northeastern Zambia. It describes the plant as perennial or a helophyte, a wetland plant rooted in saturated ground. [1]
Somandjinga and colleagues also included the species in their 2025 preliminary verified checklist of Angolan aquatic macrophytes. Their checklist combined literature, herbarium material and online databases. [2] That inclusion should be acknowledged alongside Kew’s narrower range rather than silently erased. It does not, however, justify assigning an unverified collection locality to a cultivated plant.
A country-level checklist and a particular accession’s provenance answer different questions. A plant sold with a Zambia locality should retain that history even if future research extends the species’ known distribution. Likewise, an Angolan checklist entry does not establish that every apparently similar plant photographed there belongs to this species.
The dense rosette and flowering stem
Taylor’s Flora Zambesiaca description, reproduced by Kew, gives numerous spoon-shaped leaves up to 2.5 cm long and 5 mm wide. The erect flowering stem is 6–14 cm tall, bearing 10–20 crowded flowers, and carries both short and long gland-tipped hairs. The small mauve or purple corolla measures 6–8 mm; its lower lip is three-lobed and its spur is about twice as long as that lip. [1]
The fruit stalks become longer and curve strongly downwards. The ovary and capsule also bear conspicuous glandular hairs. [1] This change in posture makes a fruiting stem a useful addition to identification photographs. A single face-on flower image leaves out the stem’s hair covering and the way the fruits are held.
Although the glandular covering is striking, the sources used here do not establish the flowering stem as an additional carnivorous organ. The species’ familiar trapping system consists of modified subterranean leaves. A gland-tipped hair is an anatomical feature; its presence alone does not demonstrate prey capture, digestion or nutrient uptake.
Wetland context and trap dimorphism
Rivadavia’s 2007 account places G. glandulosissima among Genlisea that can occupy semi-aquatic settings on floating mats of dead vegetation near streams, ponds or lakes. He also reports personally observing two trap forms in this species: shorter traps extending sideways and elongated traps descending more deeply. He cautions that fragile traps readily break during collection, which can obscure the pattern. [3]
This observation changes how an excavated specimen should be interpreted. A handful of broken traps cannot reliably show their original orientation or full length. To compare trap forms, the attachment to the plant and the position in the growing medium are as important as the isolated structure. Record an intact arrangement whenever possible.
Fleischmann’s doctoral synthesis also reports glandulosissima in permanently wet seepage areas in northern Zambia, alongside other Genlisea. [4] These observations support a wetland interpretation of the plant’s ecology. They do not support imposing a dry resting period simply because the broader region has seasonal rainfall.
A place in the African group
The molecular work reproduced in Fleischmann’s synthesis places G. glandulosissima with the perennial African G. margaretae lineage. The sampled margaretae accessions were not recovered as one exclusive group: the Madagascar accession branched separately from the mainland margaretae–glandulosissima pair. [4]
This is a result about the sampled material and analysis. It is useful evidence of relationship, but it should not be converted into a claim that the two names are interchangeable. Morphology, geographic sampling and additional data remain relevant when interpreting a phylogenetic tree.
What the genetic measurements mean
Fleischmann and colleagues’ 2014 table lists a Kasama, Zambia accession, LE263, with a flow-cytometric genome-size estimate of 189.3 megabase pairs and an approximate somatic chromosome count of 38. The approximation belongs with the chromosome count; it should not be removed when quoting the result. [5]
The plant belongs to a genus celebrated for very small genomes, but that reputation is not a licence to substitute another species’ measurement. An accession-specific estimate is more useful than a superlative such as “the smallest genome”. Neither the genome-size figure nor the chromosome count is a practical identification test that a grower can perform from a flowering photograph.
Cultivation and observing the hidden leaves
Corino’s 2020 cultivation report includes G. glandulosissima among species she grew and flowered. [6] For observing traps, Brittnacher’s 2022 genus-level method suspends a planted mesh basket in water, allowing the traps to grow through the openings. He keeps the outer container dark during growth to limit algae and cyanobacteria, transferring the basket to a clear water-filled container for viewing. His illustrated example is G. hispidula, so the article is a method to adapt, not a comparative trial proving optimal conditions for glandulosissima. [7]
The practical attraction is that the plant can be inspected without repeatedly washing soil from its delicate traps. Keep sufficient clearance beneath the basket, maintain the established water level and avoid pulling on structures that have grown through the mesh. Use the plant’s production of new leaves and flowers to assess the setup, rather than treating visibility of the traps as the sole measure of success.
This profile does not provide a species-specific fertiliser dose or a numerical propagation success rate. Those require evidence beyond inclusion on a grow list. Preserve the supplied locality and clone information with any vegetatively propagated plants.
Reading the conservation information correctly
The 2025 Angola checklist reports G. glandulosissima as Data Deficient in the IUCN information it consulted. [2] That means the available evidence was insufficient for a full risk assessment; it is not equivalent to Least Concern. The account here attributes that category to the dated checklist rather than presenting it as a newly performed assessment. Documented propagation and careful records are worthwhile regardless of whether a formal threat category changes.
Sources and further reading
- Kew and Taylor (1988): Genlisea glandulosissima taxonomy, range and Flora Zambesiaca description
- Somandjinga and colleagues (2025): Aquatic macrophytes of Angola, preliminary verified checklist
- Rivadavia (2007): A Genlisea myth is confirmed, including glandulosissima trap observations
- Fleischmann: Phylogenetic relationships, systematics and biology of carnivorous Lamiales, doctoral synthesis
- Fleischmann and colleagues (2014): Genome sizes and chromosome numbers in Genlisea
- Corino (2020): Growing Genlisea, cultivated species list
- Brittnacher (2022): Grow Genlisea so you can see the traps
Sources checked 2 October 2026. Diagnostic photographs and final release review pending.
