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Gunnera: The Giant Rhubarb
Gunnera, often referred to as "Giant Rhubarb," is a captivating genus of herbaceous flowering plants known for its dramatic size and architectural presence in gardens and landscapes.
Considerations for Pets
- Some species of Gunnera, such as Gunnera manicata, have spiny leaf stalks.
Considerations for Children
- Some species of Gunnera, such as Gunnera manicata, have spiny leaf stalks.
Scientific Name and Common Names
- Scientific Name: Gunnera spp.
- Common Names: Giant Rhubarb, Chilean Rhubarb, Giant Ornamental Rhubarb
Taxonomy and Nomenclature
- Family: Gunneraceae (Gunnera is the only member of this family)
- Species Mentioned: Gunnera manicata, Gunnera magellanica, Gunnera tinctoria, Gunnera perpensa.
Distribution and Habitat
- Native to Latin America (South America), with species distributed across the southern hemisphere, including the Antarctic Islands.
- Found in damp habitats such as damp grasslands, woodlands, and shaded areas near water.
Ecological Role
- Some species, such as Gunnera introduced to Harris, can spread aggressively and become invasive, blocking ditches and impacting local ecosystems.
Morphological Characteristics and Growth Habits
- Herbaceous perennials, ranging from small creeping plants (e.g., Gunnera magellanica) to very large specimens (e.g., Gunnera manicata).
- Some species are evergreen, while others are herbaceous rhizomatous perennials.
- Known for extremely large leaves, with Gunnera manicata producing leaves large enough to shelter a family.
- Gunnera manicata has stout, 2m spiny leaf stalks and a huge furry rhizome lying on the soil surface.
- Produces bottle-brush spikes of tiny reddish-green florets in the spring.
Quirky Facts
- Gunnera manicata thrives in the UK despite its South American origin, making it a somewhat unexpected sight in British gardens.
Interactions with Other Organisms
- Its large leaves create a unique "green twilight world," as observed in the Gunnera Passage at Trebah Garden.
Resources and Further Information
- Nonnative Species website.