University of Alberta Museums Search

Scientific Name Descurainia pinnata (Walter) Britton Common Name green tansy mustard (Johnson et al., 1995). General Description An annual herb that has simple or slightly branched stems that grow 20-60 cm tall and are slightly hairy; they bear yellow flowers (Moss, 1983; E-Flora BC). Leaves Basal leaves divided into leaflets twice (bipinnate); greenish; hairless or slightly hairy; upper leaves less divided; segments narrow (Moss, 1983). Gland-tipped hairs (Johnson et al., 1995). Flowers Unbranched, elongated inflorescence; matures bottom upwards (raceme); stalks 6-12 mm long; petals yellow; 2-3 mm long; sepals 1.5-2.5 mm long (E-Flora BC). Fruits and Seeds Dry dehiscent pod (silique); 6-13 mm long; 1-2 mm wide; stalks divergent and 6-13 mm long (Moss, 1983). Seeds in 2 rows (E-Flora BC). Phenology March to April (JSTOR). Notes 2n=14, 28*, 42 (Moss, 1983). This is a native species but has weed-like tendencies (Johnson et al., 1995). Range/Distribution

Alberta: SW along mountain range (Canadensys). CAN (BC, MB,NS, SK, NT, ON, QC, YT); USA (AZ, AR, CA, CO, CT, DE, FL, GA, ID, IL, IN, IA, KS, KY, LA, ME, MD, MA, MI, MN, MS, MO, MT, NE, NV, NH, NJ, NM, NY, NC, ND, OH,…

Alberta: SW along mountain range (Canadensys). CAN (BC, MB,NS, SK, NT, ON, QC, YT); USA (AZ, AR, CA, CO, CT, DE, FL, GA, ID, IL, IN, IA, KS, KY, LA, ME, MD, MA, MI, MN, MS, MO, MT, NE, NV, NH, NJ, NM, NY, NC, ND, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WA, WV, WI, WY) (USDA).

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