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Montana Field Guide

Montana Field Guides

Doubtful Knight's-spur - Delphinium ajacis
Other Names:  Doubtful Larkspur, Rocket Larkspur, Consolida ajacis, Consolida ambigua, Delphinium ambiguum

Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 1

External Links

General Description
Stems glabrous to sparsely puberulent, 30–80 cm. Leaves basal and cauline; the blades circular, 1–5 cm wide; ultimate lobes to 2 mm wide. Inflorescence 6- to 30-flowered with leaf-like bracts; pedicels ascending, 1–3 cm long. Flowers with spreading, blue (white) sepals 8–18 mm long, ca. equal; spur 12–20 mm long, curved up; petals united into 2, blue to whitish, 2-lobed, 5–8 mm long. Fruits, puberulent, 12–25 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
An escaped ornamental introduced in eastern U.S. and sporadically elsewhere; native to Europe (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 6

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)


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Citation for data on this website:
Doubtful Knight's-spur — Delphinium ajacis.  Montana Field Guide.  .  Retrieved on , from