Trelease'S Larkspur

delphinium treleasei

Trelease's larkspur is a stunning perennial wildflower endemic to the glades of the Ozark region in North America. This rare plant is celebrated for its brilliant, deep blue-violet blossoms that form loose, elegant clusters atop slender stems. Blooming in late spring, it serves as an important early-season resource for native pollinators, standing out as a jewel of the rocky limestone and dolomite glades it calls home. Its restricted range and specific habitat requirements make it a prized sight for hikers and botanists alike.

Habitat: Found exclusively in rocky limestone and dolomite glades, bald knobs, and barrens of the Ozark plateau.

Appearance

This herbaceous perennial typically grows 30 to 90 cm tall, featuring deeply divided, palmately lobed leaves clustered mostly near the base. The striking spurred flowers are a deep blue to violet, characterized by a prominent backward-projecting spur that holds nectar. Each blossom has five petal-like sepals and smaller, lighter-colored true petals at the center, creating a complex, hooded appearance typical of the Delphinium genus.

KingdomPlantaePhylumTracheophytaClassMagnoliopsidaOrderRanunculalesFamilyRanunculaceaeGenusDelphinium

Photo: Turner BrockmanCC BY-SA 4.0 · iNaturalistView original ↗

Trelease'S Larkspur

Interesting facts

Despite its extreme toxicity to cattle and humans, its vibrant nectar is safely enjoyed by long-tongued native bumblebees and hummingbirds.

Its scientific name, Delphinium, comes from the Greek word for dolphin, referring to the shape of the flower bud before it opens.

This species is a strict Ozark endemic, meaning it is found naturally nowhere else on Earth except for a small region in Missouri and Arkansas.

Special abilities

Produces potent diterpenoid alkaloids throughout its tissues, making it highly toxic to most mammalian herbivores and protecting it from grazing.

Possesses a deep taproot system capable of anchoring in thin, rocky soils and surviving intense summer droughts typical of glade environments.

Features specialized floral spurs that selectively reward long-tongued pollinators, ensuring efficient, high-fidelity cross-pollination.

Measurements & details

Length: 30+ cm
Lifespan: 3+ years

Diet & Feeding

As a photoautotrophic plant, it produces its own energy using sunlight, water, and carbon dioxide through photosynthesis, supplemented by soil nutrients.

Primary Foods

Sunlight
Water
Carbon Dioxide
Soil Minerals

Ecological connections

Mutualism

American Bumblebee

Bombus pensylvanicus

Feeds on the nectar of the flowers and acts as a primary pollinator.

Competitor

Eastern Red Cedar

Juniperus virginiana

Encroaches on open glades, shading out Trelease's larkspur and competing for resources.

Mutualism

Ruby-throated Hummingbird

Archilochus colubris

Visits the deep spurred flowers to feed on nectar, assisting in cross-pollination.

Traits

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Also known as

No aliases listed yet.

Collections

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Safety

Danger

1/5 · Very low

No special safety notes yet.

Frequently Asked Questions

How to identify Trelease'S Larkspur?

Start with the whole plant, then compare leaf arrangement, leaf edges, stems and any flowers or fruit. Opposite leaves grow in pairs; alternate leaves come one at a time along the stem. These details tell you far more together than a single green leaf does. Plant Identifier: upload a photo and compare the visible details.

How long is Trelease'S Larkspur?

30+ cm

How long does Trelease'S Larkspur live?

3+ years

What does Trelease'S Larkspur eat?

As a photoautotrophic plant, it produces its own energy using sunlight, water, and carbon dioxide through photosynthesis, supplemented by soil nutrients.

Where is Trelease'S Larkspur usually found?

Found exclusively in rocky limestone and dolomite glades, bald knobs, and barrens of the Ozark plateau.