UW Burke Herbarium species comparison

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Lepidium didymum

Lepidium ruderale

lesser swinecress, lesser wartcress
Habit Low, spreading, glabrous to scurfy-pubescent annual, the stems freely-branched, decumbent, 2-5 dm. long.
Leaves

Leaves alternate, numerous, ovate-oblong, 1.5-3 cm. long, pinnatifid, the segments narrow, entire to pinnatifid.

Flowers

Inflorescence of many-flowered, crowded, axillary, bractless racemes 1-4 cm. long; pedicles slender, 1.5-2.5 mm. long;

sepals 4, spreading, 0.5 mm. long, deciduous;

petals 4, white, linear, minute;

stamens 2.

Fruit

Silicles strongly wrinkled, 2 mm. broad and 1.5 mm. long, cordate and notched, inflated and slightly obcompressed.

Lepidium didymum

Lepidium ruderale
Flowering time May-July April - June
Habitat Roadsides, gardens and wasteland.
Distribution
Occurring west of the Cascades crest in Washington; British Columbia to California, Arizona, and Texas eastward and northward to the Atlantic Coast.
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Origin Introduced from South America (or possibly Eurasia)
Conservation status Not of concern Not of concern
Sibling taxa
L. appelianum, L. campestre, L. chalepense, L. densiflorum, L. dictyotum, L. draba, L. heterophyllum, L. latifolium, L. nitidum, L. oblongum, L. oxycarpum, L. perfoliatum, L. ramosissimum, L. sativum, L. strictum, L. virginicum
L. appelianum, L. campestre, L. chalepense, L. densiflorum, L. dictyotum, L. didymum, L. draba, L. heterophyllum, L. latifolium, L. nitidum, L. oblongum, L. oxycarpum, L. perfoliatum, L. ramosissimum, L. sativum, L. strictum, L. virginicum
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Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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