Lepidium didymum |
Lepidium chalepense |
|
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lesser swinecress, lesser wartcress |
Chalapa hoary cress, lens-podded hoary cress, lenspod whitetop |
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Habit | Plants annual, fetid, glabrous or pilose. | Plants perennial, densely hirsute to subglabrous; rhizomatous. |
Stems | often decumbent, 1–4.5(7) dm. |
(0.8)2.1–6.6(9.2) dm. |
Basal leaves | not rosulate, 1–6(8) cm, 1- or 2-pinnatisect; lobes entire or dentate, sometimes deeply lobed; petioles 0.5–4(6) cm. |
not rosulate, obovate, spatulate, or ovate; (1.8)2.5–8.6(14) × 1–3.7 cm; margins subentire or dentate; petioles 0.9–4.4 cm. |
Cauline leaves | similar to basal, 1.5–3.5(4.5) × 0.5–1.2 cm, bases not auriculate, petiolate to subsessile. |
obovate, oblong, lanceolate, or oblanceolate; (1.5)2.6–9.3(13.2) cm × (7)12–31(45) mm, bases sagittate-amplexicaul or auriculate; margins dentate or entire, sessile. |
Inflorescences | rachises glabrous or pubescent with straight cylindrical trichomes, fruiting pedicels divaricate to horizontal; terete; straight or slightly recurved, 1.4–2.5(4) mm, glabrous or sparsely pubescent adaxially. |
in corymbose panicles; rachises glabrous or puberulent with straight or curved cylindrical trichomes, fruiting pedicels ascending to horizontal; terete; straight, 5–16(19) mm, glabrous or sparsely puberulent adaxially. |
Flowers | sepals caducous, 0.5–0.7(0.9) mm; petals elliptic to linear, 0.4–0.5 × ~0.1 mm, white; stamens 2; median; styles absent or obsolete, included in apical notch. |
sepals caducous, 1.7–3 mm; petals obovate, 3–5 × 1.2–2.4 mm, white; stamens 6; styles (0.8)1.2–2(2.3) mm. |
Fruits | indehiscent, didymous, 1.3–1.7 × 2–2.5 mm; apical notch 0.2–0.4 mm deep; valves thick, rugose, glabrous, strongly veined; wingless. |
indehiscent, obovoid to obcompressed globose, 3.5–5.8(7) × (3.5)4–6.2(7) mm; apical notch absent; valves smooth, glabrous, usually not veined; wingless. |
Seeds | ovate, 1–1.2 × 0.7–0.8 mm; cotyledons incumbent. |
ovate, 1.5–2.3 × 1–1.3 mm; wingless; cotyledons incumbent. |
2n | =32. |
=48, 80, 128. |
Lepidium didymum |
Lepidium chalepense |
|
Distribution | ||
Discussion | Disturbed areas, fields, pastures. Flowering May–Oct. 0–300 m. Est, WV. CA, WA; north to British Columbia, eastern Canada and US, southern US; nearly worldwide. Exotic. |
Slopes, roadsides, fields, riverbanks, pastures, disturbed areas. Flowering Apr–Jun. 50–1400 m. BW, Col, ECas, Lava, Owy, Sisk, WV. CA, ID, NV, WA; Mountain and Pacific states, east into IA and south into TX; throughout midwestern and western Canada and US; Asia, Europe, South America. Exotic. |
Source | Flora of Oregon, volume 2, page 494 Ihsan Al-Shehbaz |
Flora of Oregon, volume 2, page 492 Ihsan Al-Shehbaz |
Sibling taxa | ||
Synonyms | Coronopus didymus | Cardaria chalepensis, Cardaria draba var. repens |
Web links |
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