Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
22. Brassicaceae, the Mustard Family
5. Thelypodium Endl.
1. Thelypodium integrifolium (Nutt.) Endl.
Erect, stoutly taprooted biennial 6-10 dm or more tall, glabrous, somewhat glaucous,
simple below, usually freely branched above. Leaves simple, the basal
ones usually withering early, 10-25 cm long, with blades ovate-lanceolate to
narrowly lanceolate or oblanceolate, entire to sinuate-dentate; petioles
about equaling the blades; cauline leaves sessile, linear-lanceolate
and acute below, becoming linear-attenuate and reduced above, 3-10 cm long,
2-15 mm wide. Racemes flat-topped, elongating in fruit; pedicels
slender, 4-12 mm long, ascending to spreading. Sepals whitish to purple-tinged,
linear to linear-lanceolate, 3.5-5 mm long; petals white to pink or purple-tinged,
spatulate, long-clawed, 6-9 mm long. Siliques linear, ascending, sometimes
upcurved, 20-35 mm long, borne on a stipe that extends about 1 mm or more beyond
the tip of the pedicel; seeds in 1 row in each cell of the fruit. Jun--Aug.
Wet meadows, stream banks and flats, often where alkaline or saline; ND, MT,
w SD, WY and w NE; (ND to WA, s to NE, CO, NV and OR).
Previous Species -- Thelypodium integrifolium
Return to Family -- Brassicaceae -
The Mustard Family