Pinguicula heterophylla rewards watching through an entire year. A compact resting plant, a rosette of shorter transitional leaves and a spray of long active foliage can look remarkably different. The challenge is to recognise the sequence and provide care that follows it.
Name, publication and range
- Accepted name: Pinguicula heterophylla Benth.
- Family: Lentibulariaceae.
- Native range: Morelos, Guerrero and Oaxaca, Mexico, in Kew’s treatment.
- Life form: perennial.
- Main cultivation distinction: a pronounced dry resting phase.
Kew dates the name to Plantae Hartwegianae, page 70, in 1840. Some horticultural pages give 1839; the encyclopedia follows Kew’s bibliographic date and preserves the discrepancy for readers tracing older references. Plants of the World Online.
A Mexican woodland butterwort
A 2020 account by Mata-Rosas and colleagues places the species mainly in oak–pine forest and records the same three Mexican states. The paper also notes continuing discussion of the boundaries of some Mexican species, including P. medusina. A habitat account can therefore be informative without settling every question of identification. Northwestern Oaxaca field account.
Oliver Gluch’s 2009 observations describe plants in loamy soil on a steep, west-facing oak–pine hillside. The population had long leaves in September after flowering earlier in the year. This is evidence for one observed sequence, rather than a timetable that every cultivated plant must follow. Field observations.
Leaves, flowers and the resting structure
The reproduced botanical description distinguishes shorter outer leaves from the long, narrow inner active leaves. Typical lengths for the latter are 60–90 mm, with a wider range recorded. The flower has a short spur of about 4–5 mm. During rest, the plant forms a compact, buried, bulb-like rosette protected by dry leaves. Morphological account.
“Bulb-like” describes its appearance. It is helpful to call it a resting rosette when recording the plant, so it is not confused with either a conventional flowering bulb or the cold-season hibernaculum of a northern butterwort. Include a side view of the flower and a scale when documenting the active phase.
Separating it from Pinguicula medusina
The original P. medusina description separates that species using a combination of flower characters, leaf-tip vegetative buds and gypsum habitat. It should be read as a comparison of plants and evidence, not reduced to a single yes-or-no feature. Zamudio and Studnička, 2000.
Later observations complicate a simple plantlet rule. Gluch reported leaf-tip plantlets on roughly 10–15% of plants identified as P. heterophylla at his woodland site. Elhardt and Conrad independently described a similar observation in Oaxaca and questioned the species boundary. These are attributed field identifications and interpretations; they do not by themselves establish a formal synonymy. Gluch’s report; Elhardt and Conrad’s report.
Kew continues to recognise P. heterophylla and P. medusina separately. Keep both names in the encyclopedia and retain uncertainty where an individual plant lacks adequate documentation. Neither red foliage nor the presence of a daughter plant is sufficient reason to replace its supplied label. Kew genus checklist.
Care through the transition
Eric Partrat’s growing account uses a draining mineral medium and ventilation, with active-season watering followed by a completely dry pot during rest. His greenhouse remains humid. Watering resumes gradually as active growth returns. That humidity and the observed leaf phase belong with the method; its Northern Hemisphere months should not be copied directly into an Australian routine. Cultivation observations.
Mark the plant’s position before the rosette disappears from view. Check the moisture of the medium beside it without excavating the centre. Keep the pot on a separate watering routine from butterworts that stay leafy and wet throughout the year. If the plant declines abruptly without an orderly transition, review its conditions rather than calling every disappearance dormancy.
Propagation and accession records
The species account reports propagation from non-carnivorous leaves. The ICPS’s broader Mexican leaf-pulling guide explains the importance of gentle handling and moisture management during propagation. A spare plant should retain the parent’s accession and the method used to produce it. Species notes; ICPS propagation guidance.
Keep photographs of flowers and successive leaf phases with that record. If plantlets develop, photograph them too, without treating them as a conclusive identification. This combination makes the record useful to future growers and to anyone revisiting the distinction between two closely similar species.
Part of the Nano Nursery Pinguicula Encyclopedia. Sources checked September 2026. Care guidance concerns established plants; material leaving tissue culture requires separate acclimatisation.
