Small-flower Gymnosteris - Gymnosteris parvula
State Rank Reason (see State Rank above)
Known in Montana from one 1932 collection near West Yellowstone and one recent collection from Beaverhead County.
- Details on Status Ranking and Review
Score2-3 - Very Small to Small: Population size is imprecisely known but is believed to be <10,000 individuals.
CommentPopulation levels are undocumented, but would appear to be very small to small based on the few, available collections.
Score3 - Local Endemic or Very Small Montana Range: Generally restricted to an area <10,000 sq. miles (equivalent to the combined area of Phillips and Valley Counties) or <6 Sub-basins (4th code watersheds) Range-wide OR limited to one Sub-basin in Montana
Area of Occupancy
Score3 - Very Low: Generally occurring in 3 or fewer Subwatersheds (6th Code HUC’s).
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).
ScoreNA - Rank factor not assessed.
CommentPopulation trends are unknown, though likely fluctuate greatly. Habitat appears to be stable.
Score0-1 - Low to Medium.
CommentNo significant threats are known.
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
10 to 12 total points scored out of a possible 16 (Rarity factors and threats only).
Diminutive, glabrous annuals. Stems simple, erect, 1–4 cm. Leaves linear-lanceolate, sessile, 3–13 mm long, all subtending the inflorescence. Inflorescence a terminal cluster of 1 to several, sessile flowers. Flowers funnelform; calyx 2–4 mm long, with a hyaline tube and green lobes; corolla pinkish with a yellow throat, tube 2–5 mm long, lobes ca. 1 mm long; stamens subsessile, included. Capsule with several seeds per locule (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Flowering in June.
Distinguished as a miniature annual whose stems lack leaves except for the cotyledons and single whorl of bracts just below the flower(s).
East of the Cascades in OR east to MT and WY and south to CO, UT, NV, and CA.
Observations in Montana Natural Heritage Program Database
Number of Observations:
(Click on the following maps and charts to see full sized version)
Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
Vernally moist grasslands and sagebrush steppe.
Ecological Systems Associated with this Species
- 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.
- Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
- Heidel, B. L. 1996. Noteworthy collections - Montana. Madrono 43(3):436-440.
- Wherry, E.T. 1944. Review of the genera Collomia and Gymnosteris. American Midland Naturalist 31:216-231.