Mountain Tansymustard - Descurainia incana
Other Names:
Descurainia richardsonii
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Native Species
Global Rank :
G5
State Rank :
SNR
C-value :
3
Agency Status
USFWS :
USFS :
BLM :
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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 et al. 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 .
Grasslands, steppe, open forest, often where disturbed; plains, valleys, montane (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX ).