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).
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