Streptanthella - Streptanthella longirostris
State Rank Reason (see State Rank above)
Uncommon in Montana and restricted in distribution to Carbon County. Population sizes are poorly documented and associated information on trends and threats are also lacking.
Glabrous, taprooted annual. Stems erect, branched, 15–40 cm. Leaves all cauline, sessile, narrowly oblanceolate, 3–5 cm long, entire to weakly dentate. Inflorescence an ebracteate raceme. Flowers white; petals 4–6 mm long. Fruits linear siliques, 3–6 cm long with a beak 4–6 mm long; style absent; seeds in 1 row per locule; pedicels reflexed, 1–3 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Carbon County; WA, ID and MT south to CA, AZ, NM and Mexico (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
Open, often sandy soil in sagebrush grassland, desert shrubland, and juniper woodland in the valley and foothill zones.
- Additional ReferencesLegend: View Online Publication
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- Al-Shehbaz, I. A. 1973. The biosystematics of the genus Thelypodium (Cruciferae). Contributions from the Gray Herbarium No. 204:3-148.
- Lesica, P. and P.L. Achuff. 1992. Distribution of vascular plant species of special concern and limited distribution in the Pryor Mountain desert, Carbon County, Montana. Unpublished report to the Bureau of Land Management. Montana Natural Heritage Program, Helena, MT. 105 pp.
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- 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.