Lepidium didymum |
Lepidium oxycarpum |
|
---|---|---|
lesser swinecress, lesser wartcress |
||
Habit | Plants annual, fetid, glabrous or pilose. | |
Stems | often decumbent, 1–4.5(7) 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. |
|
Cauline leaves | similar to basal, 1.5–3.5(4.5) × 0.5–1.2 cm, bases not auriculate, petiolate to subsessile. |
|
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. |
|
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. |
|
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. |
|
Seeds | ovate, 1–1.2 × 0.7–0.8 mm; cotyledons incumbent. |
|
2n | =32. |
|
Lepidium didymum |
Lepidium oxycarpum |
|
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. |
|
Source | Flora of Oregon, volume 2, page 494 Ihsan Al-Shehbaz |
|
Sibling taxa | ||
Synonyms | Coronopus didymus | |
Web links |
|
|