SafePlants

Geyer's Larkspur (Delphinium geyeri)

Geyer's Larkspur, scientifically known as Delphinium geyeri, is a perennial forb/herb commonly found in the western United States.

Considerations for Pets

• Larkspurs (Delphinium spp.) are considered poisonous plants, particularly on rangelands.
• It is mildly toxic, and symptoms of poisoning can occur if horses consume it as a primary food source.

Morphology and Growth

• Growth Habit: Perennial forb/herb with basal leaves, initiating growth in early spring.
• Height: Grows up to approximately two feet tall.
• Stems: Single, hollow stem featuring a terminal raceme of flowers.
• Leaves: Dark green and palmately lobed.
• Flowers: Features blue/purple flowers with five petals and a long spur extending from the back.

Taxonomy and Nomenclature

• Scientific Name: Delphinium geyeri Greene
• Common Name: Geyer's Larkspur
• Family: Ranunculaceae (Buttercup Family) / Helleboraceae (Hellebore)
• Rank: Species

Distribution and Habitat

• Primarily found on rangelands in the western United States.
• Specifically mentioned in locations such as Colorado (Lory State Park and Colorado State Forest State Forest).
• Low larkspurs (including Geyer's larkspur) are found in lower, drier foothill areas.

Ecological Role

• Considered a damaging poisonous plant on rangelands in the western United States.

Interactions with Other Organisms

• Research focuses on the control of Geyer's larkspur using various herbicides.
• Studies explore the abundance relationships between Geyer's larkspur and other coexisting plant species.

Further Information

• Dave's Garden: A community sharing tips and ideas for gardens, seeds, and plants.
• Montana Field Guide: Resource for submitting high-quality photos and identification of species.