Mentzelia mollis - M.E. Peck
Smooth Stickleaf
Other English Common Names: Soft Blazingstar
Other Common Names: soft blazingstar
Taxonomic Status: Accepted
Related ITIS Name(s): Mentzelia mollis M.E. Peck (TSN 503785)
Unique Identifier: ELEMENT_GLOBAL.2.140410
Element Code: PDLOA03100
Informal Taxonomy: Plants, Vascular - Flowering Plants - Blazingstar Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Violales Loasaceae Mentzelia
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Mentzelia mollis
Taxonomic Comments: Distinct species, in a small genus.
Conservation Status
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NatureServe Status

Global Status: G2
Global Status Last Reviewed: 09Jul2007
Global Status Last Changed: 08Feb1991
Rounded Global Status: G2 - Imperiled
Reasons: Endemic to Succor Creek Formation ash/claybed outcrops of the Owyhee Desert in southeastern Oregon and adjacent southwestern Idaho, with disjunct populations in the Black Rock Desert area of northern Nevada. Many occurrences are located in areas with mining claims. Habitat degradation threats include mineral exploration, off-road vehicle recreational activity, and range improvement programs.
Nation: United States
National Status: N2

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States Idaho (S2), Nevada (S1), Oregon (S2)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Edaphic endemic, restricted to volcanic ash outcrops in the Succor Creek drainage, Malheur County, Oregon and adjacent Idaho. One historic occurrence near Harper (Malheur County) and one disjunct occurrence in Nevada. Oregon's generalized range is 250 sq. km. so estimated to be twice this when including other states.

Area of Occupancy: 3-500 4-km2 grid cells
Area of Occupancy Comments: Oregon populations are a little over 0.4 sq. km.

Population Size Comments: Locally abundant on substrate, when available and not compacted. Oregon populations at least 37,000.

Number of Occurrences with Good Viability/Integrity: Few (4-12)
Viability/Integrity Comments: Nine to eleven occurrences in Oregon considered of good to excellent viability.

Overall Threat Impact Comments: Mining, off-road vehicle use, range "improvement" programs.

Short-term Trend: Unknown

Long-term Trend: Unknown

Intrinsic Vulnerability Comments: Plants do not germinate easily on compacted soil (e.g., by off-road vehicles). Does recolonize after disturbance if soil is permeable.

Environmental Specificity: Very narrow. Specialist or community with key requirements scarce.
Environmental Specificity Comments: Restricted to ash deposits of Sucker Creek Formation

Other NatureServe Conservation Status Information

Distribution
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Global Range: Edaphic endemic, restricted to volcanic ash outcrops in the Succor Creek drainage, Malheur County, Oregon and adjacent Idaho. One historic occurrence near Harper (Malheur County) and one disjunct occurrence in Nevada. Oregon's generalized range is 250 sq. km. so estimated to be twice this when including other states.

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States ID, NV, OR

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
ID Owyhee (16073)
NV Humboldt (32013)
OR Malheur (41045)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
16 Lower Quinn (16040202)+
17 Middle Snake-Succor (17050103)+, Lower Malheur (17050117)+*
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: An erect, bright yellow-flowered, annual herb, 5-12 cm high, that blooms in May and June.
General Description: A small, finely hairy, branching annual growing 2 to 4 1/2 inches tall (5-12 cm), with small bright yellow 1/3 inch long flowers clustered in a terminal head sitting upon 2 or 3 smallish leaf-like stuctures. Few toothed leaves are crowded below and are usually less hairy then the stems. The fruit is a 4-sided capsule.
Technical Description: A low annual 5-12 cm high; stem stout, erect and branching, dark-colored, puberulent but not scabrous, at least when young, the fine hairs glochidiate; leaves crowded below, oblong-lanceolate or oblanceolate, obtuse, entire or obscurely repand, or with one or two low teeth, sessile or subsessile, less puberulent than the stem; flowers in small terminal clusters, nearly sessile and subtended but not hidden by 2 or 3 reduced leaves; calyx-segments broadly lanceolate, 4-6 mm long; petals narrrowly ovate, bright yellow, 10-12 mm long; stamens 40-50, shorter than the petals, the filaments filiform-subulate; style much longer than the stamens, the stigma capitate; capsule 4-sided, 2.5 cm long. (Peck 1961)
Terrestrial Habitat(s): Barrens
Habitat Comments: Sparsely vegetated, white, green, brown, or gray volcanic ash/claybed outcrops derived from the Succor Creek Formation. The few associated species may include large-flowered phacelia (Phacelia lutea) and red poverty weed (Monolepis pusilla). 1160 to nearly 1525 m elevation. Adjacent areas support sagebrush-shadscale plant communities.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 22Jan1988
NatureServe Conservation Status Factors Author: Joyal, E., rev. S. Vrilakas (2006)

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
Help
  • Glad, J.B. 1975. Taxonomy and ecology of Mentzelia mollis Peck and related species. Masters thesis, Oregon State University, Corvallis, OR.

  • Glad, J.B. 1975. Taxonomy and ecology of Mentzelia mollis Peck and related species. Corvallis: Oregon State University, M.S. thesis.

  • Glad, J.B. 1976. Taxonomy of Mentzelia mollis and allied species (Loasaceae). Madrono 23: 283-292.

  • Glad, J.B. 1976. Taxonomy of Mentzelia mollis and allied species. Madrono 23: 283-292.

  • Greenleaf, J. 1980. Report on Mentzelia mollis Peck. 14 pp.

  • Holland, R.F. 1994. Status report for Mentzelia mollis Peck (1945). Carson City: Nevada Natural Heritage Program, prepared for the U.S. Fish and Wildlife Service, Reno.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Meinke, R.J. 1982. Threatened and Endangered Vascular Plants of Oregon: An Illustrated Guide. U.S. Fish and Wildlife Service, Region 1, Portland, Oregon. 326 pp.

  • Nevada Natural Heritage Program. 1986-present. Slide collection files. Carson City.

  • Peck, M. E. 1945. Some interesting plants of Malheur County, Oregon. Leaflets of Western Botany 4: 177-196.

  • Rosentreter, R. 1986. Sensitive and uncommon plants in the Boise District Bureau of Land Management. Bureau of Land Management, Idaho State Office, Technical Bull., Boise, ID. 87 pp.

  • Smithman, L.C. 1989. Distribution and Occurrence of Mentzelia mollis Peck. Unpublished report, BLM Vale District, Vale, OR. 41 pp.

  • Smithman, L.C. 1989. Distribution and occurrence of Mentzelia mollis Peck. Unpublished report, Bureau of Land Management Vale District, Vale, OR. 41 pp.

  • Steele, B., F. Johnson, and S. Brunsfield, eds. 1981. Vascular plant species of concern in Idaho. Forest, Wildlife and Range Experiment Station, Moscow, ID. 161 pp.

  • Tiehm, A. 1984. Noteworthy collections, Nevada. Madrono 31: 123-127.

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