Nano Nursery · Rare Carnivorous Plant Encyclopedia
Genlisea stapfii has been treated both as a species and as a subspecies of G. africana. The currently accepted species offers a useful lesson in reading African corkscrew-plant literature: changes of rank do not erase the older records, but they do require care when comparing names, descriptions and identification keys.
The accepted name and its synonym
Kew accepts Genlisea stapfii A.Chev., published in 1912, and treats G. africana subsp. stapfii as a homotypic synonym. It records an annual life form across western and west-central tropical Africa, including Guinea, Senegal, Nigeria, Cameroon and Gabon. [1]
“Homotypic” means that the two names are based on the same nomenclatural type. They reflect different placement or rank, not separate reference specimens defining two unrelated entities. In an encyclopedia, the older subspecies name therefore needs a cross-reference to this species rather than a duplicate profile implying an additional plant to collect.
Recognition in the Gabon flora
The Flore du Gabon account describes a terrestrial annual with a short stem and a dense rosette. Leaves range from rounded to spoon-shaped. Its inflorescence may be simple or branch above, with glandular hairs mixed with shorter ordinary hairs. Flowers are violet, mauve or pink, with a yellowish reticulate mark on the raised palate and a deeply three-lobed lower lip. [2]
That colour range is a reason to avoid using one shade as a diagnostic boundary. The presence, position and type of hairs can be more informative, especially when compared on the same structures and at the same developmental stage. The floral throat, spur and ovary require closer examination than the overall colour of an inflorescence.
A key that needs its geographic context
The 1996 description of G. barthlottii supplied a key for the Flora of West Tropical Africa area. It separated G. stapfii by short-stalked glandular hairs covering nearly all the ovary, contrasting with longer hairs restricted to the upper part in G. barthlottii. It also used spur proportions as a distinguishing tendency. [3]
The Gabon account gives a spur one to two times the lower-lip length, whereas the 1996 regional key describes the spur of G. stapfii as generally shorter than that lip. [2], [3] The discrepancy should not be concealed. It makes the ovary indumentum, specimen provenance and choice of regional treatment particularly important when an identification is uncertain. A single ratio taken from one key is not sufficient to dismiss the rest of a plant’s characters.
Wet sites within a seasonal landscape
The Gabon flora records marshy savannas on Kalahari sand, wet rocks and inselbergs, with low-elevation Gabon records. [2] Kew’s broader classification places the species in a seasonally dry tropical biome. [1] A wet flush on a rock surface can coexist with a region that has a pronounced dry season; the two descriptions are not contradictory.
For an annual, the duration of a suitable wet period can be central to completing growth and reproduction. That is an ecological interpretation, not a measured timetable for this species. A collection should record germination, flowering and seed maturation separately rather than assuming that an annual must complete its life at a fixed age in every setting.
What a cultivation account still needs
The primary sources checked provide botanical and habitat evidence, but not a validated numerical growing recipe for G. stapfii. They do not establish an optimum water depth, temperature or seed-storage duration. An account of another African Genlisea should not fill those gaps simply because the plants share a continent.
For an established accession, the most useful practical evidence would be repeated successful seed-to-seed cycles under documented conditions. A rosette surviving for a few weeks is a different result from a population renewing itself through viable seed. If experimenting, preserve the original seed-batch identity and distinguish seed age from time since sowing. Those details make successes and failures interpretable.
Preserving the botanical history
An old label reading G. africana subsp. stapfii can be linked directly to the accepted name while remaining in the accession history. A label saying only G. africana, however, is not automatically evidence for this species. It may concern a different taxonomic concept or a different plant.
The species’ broad regional range does not establish the condition of every population. This profile assigns no new conservation category. Its contribution is a clear connection between the current name, the older rank, the African flora description and the limitations of a commonly cited identification key.
Sources and further reading
- Kew, Plants of the World Online: accepted name and range
- Flore du Gabon (2020): Genlisea stapfii account, through WFO
- Porembski, Fischer and Gemmel (1996): West African Genlisea key, page 154
Sources checked 2 October 2026. Diagnostic photographs and final release review pending.
