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Montana Field Guides

Weak-stemmed Stonecrop - Sedum debile

Native Species

Global Rank: G4G5
State Rank: S3S4
(see State Rank Reason below)

Agency Status


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State Rank Reason (see State Rank above)
Considered to be locally common in the southern Bitterroot Mountains (Lesica & Shelly, 1991).
General Description
Glabrous perennial herbs. Stems decumbent, branched, bearing erect rosettes. Leaves 4-7 mm, ascending, sessile; blades pale green, speckled with pink, sometimes pink or red, glaucous, usually elliptic, oblanceolate, or obovate, sometimes ovate-elliptic, subterete, ± globular. Inflorescences cymose, 2-7-flowered, forked. Pedicels to 1.2 mm. Sepals 2-4.2 mm, erect, connate basally, apex obtuse; petals 6-9 mm, connate basally, yellow, elliptic-lanceolate, slightly carinate, , apex obtuse with mucronate appendage; filaments and anthers yellow. Carpels erect or ascending in fruit, connate basally, straw colored with purple stripes (adapted from: H. Ohba, 2009, in Flora N. America, Vol. 8).

Range Comments
A Great Basin species from ID to OR, NV, WY, and UT with reports (Clausen 1975) from Colfax County, NM, that need to be reconfirmed (Kartesz in prep. 2012).

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)

Shallow soil over bedrock in the montane and subalpine zones.

The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus bifarius, Bombus flavifrons, Bombus frigidus, Bombus huntii, Bombus melanopygus, Bombus sylvicola, Bombus occidentalis, Bombus griseocollis, Bombus insularis, and Bombus kirbiellus (Macior 1974, Thorp et al. 1983, Shaw and Taylor 1986, Wilson et al. 2010, Miller-Struttmann and Galen 2014).

  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Macior, L.M. 1974. Pollination ecology of the Front Range of the Colorado Rocky Mountains. Melanderia 15: 1-59.
    • Miller-Struttmann, N.E. and C. Galen. 2014. High-altitude multi-taskers: bumble bee food plant use broadens along an altitudinal productivity gradient. Oecologia 176:1033-1045.
    • Shaw, D.C. and R.J. Taylor.1986. Pollination ecology of an alpine fell-field community in the North Cascades. Northwest Science 60:21-31.
    • Thorp, R.W., D.S. Horning, and L.L. Dunning. 1983. Bumble bees and cuckoo bumble bees of California (Hymenoptera: Apidae). Bulletin of the California Insect Survey 23:1-79.
    • Wilson, J.S., L.E. Wilson, L.D. Loftis, and T. Griswold. 2010. The montane bee fauna of north central Washington, USA, with floral associations. Western North American Naturalist 70(2): 198-207.
  • Additional ReferencesLegend:   View Online Publication
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    • Hodgson, J.R. 1970. Ecological distribution of Microtus montanus and Microtus pennsylvanicus in an area of geographic sympatry in southwestern Montana. Ph.D. Dissertation. Bozeman, Montana: Montana State University. 65 p.
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Citation for data on this website:
Weak-stemmed Stonecrop — Sedum debile.  Montana Field Guide.  .  Retrieved on , from