Pinguicula rotundiflora illustrates how much a Mexican butterwort can change through its growing cycle. Its compact resting rosette can flower before the larger trapping leaves dominate. A single photograph therefore captures only part of its identity.
Accepted name and older labels
Kew accepts Pinguicula rotundiflora Studnicka, published in 1985, as a perennial native to northeastern Mexico. It treats Pinguicula jorgehintonii B.L.Turner as a synonym. Records carrying that older name should be connected to the accepted species without deleting their original accession wording. Kew taxonomic record.
The specialist account also records “Pinguicula rayonensis” as a nomen nudum, a name lacking the requirements for valid publication in that usage. It belongs in the history of labels, not automatically in a list of accepted additional species. Historical names.
Flowers and growth stages
In a field report from northeastern Mexico, Fernando Rivadavia described a pale lilac flower with yellow patches and white hairs around the throat, additional purple colouring and a reddish spur. He photographed compact rosettes and others beginning to produce new seasonal leaves. This is a description of observed plants, not a claim that every accession must match every shade. Field flowers and rosettes.
When identifying a plant, retain a side view showing the tube and spur as well as the flower face. Compare the flower with its own rosette on the same date. A resting plant compared with another species in full growth can create a misleading impression of a permanent size difference.
Habitat diversity
The specialist account records localities in Tamaulipas and Nuevo León, including calcareous ground and gypsum-associated sites. Rivadavia's field report independently documents plants on gypsum. This gives the species a more specific ecological context than a generic “Mexican mountain plant” label. Locality and habitat account; Gypsum-site observations.
A substrate association in nature is a starting point for investigation, not proof that adding gypsum to any pot will improve growth. Particle size, water movement and seasonal moisture also matter. If the accession's previous grower has a successful method, preserve that baseline before testing a different mineral composition.
Seasonal care
Eric Partrat's cultivated plants alternate between trapping leaves and a small succulent rosette, with flowers arising from the resting phase. His method combines a mineral medium with active-season watering and a dry rest in humid greenhouse air. The account explicitly makes watering transitions depend on the leaves. Cultivation observations.
The ICPS group guide supports attention to changing seasonal light and reduced watering during succulent growth. It should supplement the species observations rather than replace them. In particular, flowering alone does not justify returning a compact resting rosette to a continuously wet regime. Mexican-butterwort guidance.
Propagation and interpreting failures
Partrat reports successful leaf propagation, especially with succulent leaves, and also notes that one seed attempt failed to germinate. That unsuccessful batch is not evidence that the species is sterile. Keep seed viability, pollination success and growing conditions as separate questions. Propagation account.
For a new leaf-propagation trial, label each parent accession and record the leaf stage, date and outcome. Retain an undisturbed parent as a comparison. Over a full cycle, photographs of the resting rosette, transition and flowering will add more diagnostic value than repeated pictures of the plant at its largest. Authenticated images and an accession-specific care record remain outstanding for publication.
