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Montana Field Guide

Montana Field Guides

Hutchinsia - Hornungia procumbens
Other Names:  Hutchinsia procumbens

Species of Concern

Global Rank: G5
State Rank: S2
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank: 3
C-value: 4

External Links






State Rank Reason (see State Rank above)
Rare in Montana. Currently known from approximately a half-dozen occurrences scattered across the mountainous portion of the state. Trend and population data are generally lacking, though it is an annual and populations probably fluctuate widely from year to year. Threats to the species' viability in Montana appear to minimal.
  • Details on Status Ranking and Review
    Hutchinsia (Hornungia procumbens) Conservation Status Review
    Review Date = 05/30/2013
    View State Conservation Rank Criteria
    Population Size

    Score1-2 - Small to Moderate. Population size is imprecisely known but is believed to be >2,000 individuals and <100,000 individuals.

    CommentPopulation levels are poorly documented and each occurrence has only one observation.

    Range Extent

    Score1 - Peripheral, Disjunct or Sporadic Distribution in MT: Widespread species that is peripheral, disjunct or sporadically distributed within MT such that it occurs in <5% of the state (<7,500 sq. miles or the combined area of Beaverhead and Ravalli Counties) or is restricted to 4-5 sub-basins.

    Area of Occupancy

    Score2 - Low: Generally occurring in 4-10 Subwatersheds (6th Code HUC’s).

    Environmental Specificity

    Score1 - Moderate: Species is restricted to a specific habitat that is more widely distributed or to several restricted habitats and is typically dependent upon relatively unaltered, good-quality habitat (C Values of 5-7).

    Trends

    ScoreNA - Rank factor not assessed.

    Threats

    Score0-1 - Low to Medium.

    Intrinsic Vulnerability

    Score1 - Moderate Vulnerability: Specific biological attributes, unusual life history characteristics or limited reproductive potential makes the species susceptible to extirpation from stochastic events or other adverse impacts to its habitat and slow to recover.

    Raw Conservation Status Score

    Score 6 to 8 total points scored out of a possible 16 (Rarity factors and threats only).

 
General Description
Hornungia procumbens is an annual with branched, erect stems that are 2-10 cm high. Alternate, narrowly lance-shaped leaves, 5-20 mm long with entire margins or a pair of basal lobes, are largest at the base of the plant. Foliage is glabrous. Numerous tiny, stalked flowers are borne at the top of the stems in a spreading, elongate inflorescence. Each flower has 4 white, separate petals that are ca. 1 mm long, which fall shortly after opening. The glabrous, egg-shaped fruits, or siliques, are 3-5 mm long and borne on spreading stalks that are up to 10 mm long.

Phenology
Flowering in June, mature fruit in July.

Diagnostic Characteristics
The lack of a basal rosette separates Hornungia from Draba. Lepidium, Thlaspi and Alyssum have fruits that are notched or flattened on top. Small mustards such as Hornungia may be difficult to identify. A technical manual should be consulted, and a hand lens may be required.

Species Range
Present
 


Range Comments
BC and MT south to CA; Eurasia (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 7

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Vernally moist, alkaline soil of sagebrush steppe in the valley to lower montane zones.

Ecological Systems Associated with this Species

References
  • Additional ReferencesLegend:   View Online Publication
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    • Lackschewitz, K., P. Lesica and J. S. Shelly. 1988. Noteworthy collections: Montana. Madrono 35:355-358.
    • Lesica, P. 1994. The distribution of plant community diversity associated with glacial wetlands in the Ovando Valley, Montana. [Unpublished report.] The Nature Conservancy, Montana Field Office, Helena. 26 pp.
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Vanderhorst, J.P. and P. Lesica. 1994. Sensitive plant survey in the Tendoy Mountains, Beaverhead County, Montana. Unpublished report to the Bureau of Land Management, Butte District. Montana Natural Heritage Program, Helena, MT. 59 pp. plus appendices.
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Citation for data on this website:
Hutchinsia — Hornungia procumbens.  Montana Field Guide.  .  Retrieved on , from