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Montana Field Guide

Montana Field Guides

Mountain Tansymustard - Descurainia incana
Other Names:  Descurainia richardsonii


Global Rank: G5
State Rank: SNR

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

External Links






 
General Description
Biennial. Stems 10–80 cm. Stem leaves 3–8 cm long, ovate to oblanceolate, pinnate, the pinnae lobed to entire. Vestiture of minute branched hairs to glabrous or glandular. Petals yellow, 1–2 mm long. Fruit curved to straight, erect to ascending, 4–15 mm × up to 1 mm, tapering at both ends; style 0.2–0.4 mm long; seeds 4 to 8 per locule in 1 row; pedicels erect to spreading (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Infraspecific taxa recognized currently for Montana are subspecies incana or viscosa, and variety macrosperma.

Few Floras agree entirely on how to treat these taxa. Lesica (2012) reconized four taxa at the varietal level: viscosa, macrosperma, major, and incana.

Species Range
Present
 


Range Comments
AK to QC south to CA, UT, CO, SD and MN (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 21

(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
Grasslands, steppe, open forest, often where disturbed; plains, valleys, montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Mountain Tansymustard — Descurainia incana.  Montana Field Guide.  .  Retrieved on , from