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Montana Field Guides

Twiggy Halimolobos - Transberingia bursifolia ssp. virgata
Other Names:  Transberingia virgata, Halimolobos virgata

Status Under Review
Native Species

Global Rank: G3
State Rank: S3?

Agency Status


External Links

General Description
Twiggy halimolobos is a rosette-forming, annual or short-lived perennial with 1-several, erect, simple or branched stems, 10-35 cm (4-14 in) high, from a taproot. The lance-shaped basal leaves, up to 3-6 cm (1-2 in) long, have petioles and toothed margins. Upper stem leaves are smaller and the base of the blades clasp the stem. Foliage is covered with branched hairs. Stalked flowers occur at the stem tips in a compact, unbranched inflorescence that expands as the fruits mature. Each flower has 4 separate, purplish sepals, 4 separate, white petals, ca. 4 mm long, and 4 long and 2 short stamens. The style is less than 0.5 mm long. The glabrous, linear capsules (siliques), 15-40 mm long, with a circular cross section, are borne on ascending stalks, 7-11 mm long.

Flowering and fruiting from May to early July.

Diagnostic Characteristics
Leaves of H. perplexa do not clasp the stem, and the siliques are hairy. Species of Arabis usually have flattened siliques.

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)

Sparsely vegetated, dry soil of sagebrush steppe, grasslands or mountain mahogany woodlands in the valleys and montane zone.

  • Additional ReferencesLegend:   View Online Publication
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    • Heidel, B.L. 1994. Sensitive plant survey in the Sweetgrass Hills, Liberty and Toole Counties, Montana. Unpublished report for the Great Falls Resource Area, Lewistown District, Bureau of Land Management. Montana Natural Heritage Program, Helena, MT.
    • Lesica, P. and J. Vanderhorst. 1995. Sensitive plant survey of the Sage Creek area, Beaverhead County, Montana, Dillon Resource Area, Bureau of Land Management. Unpublished report to the Bureau of Land Management. Montana Natural Heritage Program. 36 pp. plus appendices.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
    • Rollins, R. 1943. Generic revisions in the Cruciferae: Halimolobos. Contributions from the Dudley Herbarium. Natural History Museum of Stanford University, Stanford University, California.
    • Rollins, R. C. 1993. The Cruciferae of Continental North America: systematics of the mustard family from the Arctic to Panama. Stanford University Press, Stanford, California. 976 pp.
    • Vanderhorst, J.P. and P. Lesica. 1995a. Sensitive plant survey of the Tendoy Mountains in the Beaverhead National Forest, Beaverhead County, Montana. Unpublished report to the Bureau of Land Management, Butte District. Montana Natural Heritage Program, Helena, MT. 59 pp. plus appendices.
    • Westech, Inc. [Western Technology and Engineering]. 1989. Rare plant inventory and plant community descriptions of the Sweet grass Hills Proposed Area of Critical Environmental Concern (PACEC), Toole and Liberty Counties, Montana. Unpublished report to USDI Bureau of Land Management, Great Falls, Montana, 36 pp. plus appendices.
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Citation for data on this website:
Twiggy Halimolobos — Transberingia bursifolia ssp. virgata.  Montana Field Guide.  .  Retrieved on , from