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Montana Field Guide

Montana Field Guides

Geyer's Larkspur - Delphinium geyeri

Status Under Review

Global Rank: G5
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value:

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General Description
Geyer's Larkspur is a perennial 30-60 cm tall arising from deep, branched, fibrous roots. Leaves are basal and cauline, with dense, minute pubsecence, and palmately divided with more rounded, wider lobes on basal leaves than stem leaves. Sepals are bright blue and flared, with spurs that are straight to slighty down-curved. Upper petals are whitish with blue tips, lacking prominent blue-purple lines.

Diagnostic Characteristics
Distinguished from Delphinium bicolor by the presence of dense, minute pubscence; also distinguished from D. bicolor subsp. calcicola by the cleft in the low petal 2 mm or less.

Habitat
Open slopes and thickets at lower elevations.

References
  • Additional ReferencesLegend:   View Online Publication
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    • Ewan, J. 1945. A synopsis of the North American species of Delphinium. University of Colorado Studies 2(2):55-242.
    • Lesica, P. and P.L. Achuff. 1992. Distribution of vascular plant species of special concern and limited distribution in the Pryor Mountain desert, Carbon County, Montana. Unpublished report to the Bureau of Land Management. Montana Natural Heritage Program, Helena, MT. 105 pp.
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Taylor, R.J. 1960. The genus Delphinium in Wyoming. University of Wyoming publications 24:9-21.
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Citation for data on this website:
Geyer's Larkspur — Delphinium geyeri.  Montana Field Guide.  .  Retrieved on , from