Key to Wisconsin Lepidium

Author: John G. Zaborsky

• 1a.Cauline leaves (at least the upper) sessile, the bases auriculate, sagittate, or clasping. 2

• 1b.Cauline leaves petiolate or subsessile but never with auriculate, sagittate, or clasping bases. 5

• 2a.Flowers yellow; upper cauline leaf bases cordate-clasping; plants glabrous distally L. perfoliatum

• 2b.Flowers white; upper cauline leaf bases auriculate or sagittate; plants puberulent or pubescent distally. 3

• 3a.Annuals; fruits broadly winged at the apex; racemes elongated in fruit L. campestre

• 3b.Rhizomatous perennials; fruits not winged at the apex; racemes not elongated in fruit. 4

• 4a.Fruits flattened, glabrous, cordate, valves veined L. draba

• 4b.Fruits inflated, pubescent, globose, valves not veined L. appelianum

• 5a.Perennials with thick rhizomes L. latifolium

• 5b.Annuals 6

• 6a.Upper cauline leaves entire or toothed; stems erect or ascending. 8

• 6b.Upper cauline leaves pinnatisect or dentate to laciniate or pinnatifid; stems decumbent to ascending or erect 7

• 7a.Fruit valves rugose; plants glabrous or pilose L. didymum

• 7b.Fruit elliptic; pedicels pubescent all around; basal leaves 1- or 2-pinnatisect L. oblongum

• 8a.Fruit elliptic; pedicels pubescent all around; basal leaves 1- or 2-pinnatisect L. ruderale

• 8b.Fruit obovate or orbicular; pedicels glabrous below; basal leaves toothed or pinnatifid. 9

• 9a.Fruits obovate, widest below the middle; rachises with straight, clavate hairs; petals absent or rudimentary, less than 1 mm long; cotyledons incumbent L. densiflorum

• 9b.Fruits orbicular, widest at the middle; rachises with curved, cylindrical hairs; petals usually present and over 1 mm long; cotyledons accumbent L. virginicum