Loganiaceae — a tropical family of the order Gentianales

Key characteristics

Plants in this family show a range of growth forms and reproductive structures, but several traits are frequent:

• Habit: trees, shrubs, lianas and some herbaceous species;
• Leaves: generally simple and often opposite, without prominent stipules;
• Flowers: usually bisexual, actinomorphic to slightly zygomorphic, often with tubular corollas;
• Fruits: variable—capsules, berries or drupes occur in different genera.

Taxonomy and history

The circumscription of Loganiaceae has been unstable. Traditional, morphology-based systems included many diverse genera. With the advent of molecular phylogenetics, several genera were reassigned to other families and some groups were split off, producing the smaller modern concept of the family used by many botanists today.

Distribution and ecology

Loganiaceae is essentially pantropical: species occur in lowland and montane rainforests as well as in seasonally dry tropical regions. Members occupy understory and canopy niches and interact with a variety of pollinators and dispersers, including insects and birds, depending on flower and fruit form.

Uses and notable facts

Several plants historically placed in or associated with this group produce biologically active alkaloids and have traditional medicinal or toxic uses. Because of chemical diversity and phylogenetic complexity, the family is of ongoing interest in systematic botany and natural-products research. For general context see flowering plants.

Distinguishing the family

Identification often relies on a combination of vegetative and floral characters plus geographic context. Given past reassignments, consultation of up-to-date taxonomic treatments or molecular studies is recommended when determining whether a particular genus belongs within Loganiaceae.