Meadow Larkspur - Delphinium burkei
Other Names:
[including] Delphinium distichum
Species of Concern
Global Rank:
G4
State Rank:
S1S2
* (see State Rank Reason below)
Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value:
External Links
State Rank Reason (see State Rank above)
Only known from a few collections from the western half of the state.
General Description
Meadow larkspur is a perennial herb with non-hollow stems, 4-7 dm (16-28 in) high, from a cluster of short, tuberous roots. The long-stalked basal leaves, 4-6 cm (ca. 2 in) wide, are hemispheric in outline and twice divided like the fingers on a hand into broad, rounded lobes. The numerous leaves of the upper stem are once deeply divided into linear segments. Foliage is covered with fine, short, white hairs. Flowers are well separated in a spike at the top of the stem; lower flowers are stalked, while the upper are not. Each flower has 5 blue petal-like sepals, 7-9 mm long, projecting forward. The upper one has a conical spur, 11-17 mm long, projecting back. The 2 lower petals are blue and longer than the sepals, while the 2 upper petals are white and shorter. The fruit is an erect, hairy, oblong, 3-lobed capsule, 8-12 mm long.
Phenology
Flowering in July.
Diagnostic Characteristics
Easily confused with D. depauperatum, which is usually shorter, less hairy, with fewer, but larger flowers and sepals usually darker. Also, D. depauperatum has fewer stem leaves. Leaf dimorphy is also expressed in D. depauperatum, just to a lesser degree. The leaves of D. depauperatum are usually less deeply divided or have broader leaf lobes. Both grow in moist meadows, but D. burkei tends to prefer meadows that fully desiccate in summer.
Species Range
Range Comments
BC to OR, east to ID, and MT (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Summary of Observations Submitted for Montana
Number of Observations: 9
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Relative Density
Recency
(Observations spanning multiple months or years are excluded from time charts)
Habitat
Moist meadows in the valley and lower montane zone. Usually where soils are saturated in spring, desiccated in summer.
References
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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., 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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