Pepperwort - Marsilea oligospora
State Rank Reason (see State Rank above)
Marsilea oligospora has relatively recently been segregated from Marsilea vestita (FNA 1993). It is quite common around Ninepipes National Wildlife Refuge, but has not been documented elsewhere in Montana. Observation data is greatly needed to further assess its distribution and viability in Montana.
- Details on Status Ranking and Review
ScoreA - <100 sq km (< ~40 sq mi)
Area of Occupancy
ScoreD - 6-25 4-km2 grid cells
Number of Populations
ScoreB - 6 - 20
Number of Occurrences or Percent Area with Good Viability / Ecological Integrity
ScoreC - Few (4-12) occurrences with excellent or good viability or ecological integrity
ScoreB - Narrow. Specialist or community with key requirements common
ScoreB - High
CommentThreat category includes: Noxious weeds (potential) and hydrologic alterations (potential).
Leaf petioles 3–6 cm long. Pinnae 6–15 mm long, pilose. Sporocarps nodding, 5–6 mm long, long-hairy but glabrous with age; lower tooth ca. 0.5 mm; upper tooth blunt, smaller, or absent (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Ranging from WA to CA, extending east to MT, WYand UT.
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)
Shallow water; valleys; collected in Lake Co. and the Blackfoot River Valley (Lesica 2012.
- Additional ReferencesLegend: View Online Publication
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- Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.