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Montana Field Guide

Montana Field Guides

Purple Dragon-head - Physostegia parviflora

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Native Species

Global Rank: G4G5
State Rank: S4
C-value: 7

Agency Status


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General Description
Rhizomatous perennial herbs. Stems erect, 20–80 cm, usually simple. Leaves 3–10 cm long, sessile, lanceolate to oblanceolate, serrate; the lowest deciduous. Herbage glabrous below the inflorescence, non-aromatic. Inflorescence of bracteate, pedicellate flowers in a terminal, simple or branched, glandular puberulent raceme. Flowers: calyx 4–6 mm long, glandular,10-veined, the subequal 5 lobes shorter than the tube; corolla 10–15 mm long, lavender, bilabiate; upper lip hood-like, 3–5 mm long; lower lip reflexed down with 3 nearly equal lobes; stamens 4, included in the upper lip; style equally lobed (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
BC to MN south to OR, ID, WY and NE (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 1

(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)

Moist, often stony soil on banks of streams, wetlands; valleys (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus vagans (Colla and Dumesh 2010).

  • Literature Cited AboveLegend:   View Online Publication
    • Colla, S.R. and S. Dumesh. 2010. The bumble bees of southern Ontario: notes on natural history and distribution. Journal of the Entomological Society of Ontario 141: 39-68.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Web Search Engines for Articles on "Purple Dragon-head"
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Citation for data on this website:
Purple Dragon-head — Physostegia parviflora.  Montana Field Guide.  .  Retrieved on , from