Lepidium draba |
Lepidium appelianum |
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heart-podded hoary cress, hoary pepperwort |
globe-podded hoary cress, hairy whitetop |
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Habit | Plants perennial, hirsute to subglabrous; rhizomatous. | Plants perennial, densely hirsute; rhizomatous. |
Stems | (0.8)2–6.5(9) dm. |
(1)1.5–3.5(5) dm. |
Basal leaves | not rosulate, obovate, spatulate, or ovate; (1.5)3–10(15) × 1–4 cm; margins dentate or entire; petioles 1–4 cm. |
not rosulate, obovate to oblanceolate; (1)2–6(7) cm × 3–20 mm; margins dentate; petioles 0.5–1.5 cm. |
Cauline leaves | ovate, elliptic, oblong, lanceolate, or obovate; (1)3–9(15) × (0.5)1–2(5) cm, bases sagittate-amplexicaul or auriculate; margins dentate or entire, sessile. |
oblong or lanceolate, 1–5(8) cm × (3)5–15(30) mm, bases sagittate; margins dentate or subentire, sessile. |
Inflorescences | corymbose panicles; rachises glabrous or puberulent with straight or curved cylindrical trichomes, fruiting pedicels ascending to horizontal; terete; straight, 5–10(15) mm, glabrous or sparsely puberulent adaxially. |
in corymbose panicles; rachises pubescent with often curved trichomes, fruiting pedicels divaricate to ascending; terete; straight or slightly curved, 3–9(12) mm, pubescent all around. |
Flowers | sepals caducous, 1.5–2.5 mm; petals obovate; (2.5)3–4(4.5) × (1)1.3–2(2.2) mm, white; stamens 6; styles (0.6)1–1.8(2) mm. |
sepals caducous, 1.4–2 mm; petals broadly obovate; (2.2)2.8–4 × 1–3 mm, white; claws 1–1.4 mm; stamens 6; styles 0.5–1.5 mm. |
Fruits | indehiscent, flattened, cordate to subreniform; (2)2.5–3.7(4.3) × (3.2)3.7–5(5.6) mm; tips obtuse to subacute; apical notch absent; valves smooth, glabrous, reticulate-veined; wingless. |
indehiscent, globose to rarely subglobose, inflated; (2)3–4.4(5) mm in diameter; apical notch absent; valves smooth, densely puberulent, not veined; wingless. |
Seeds | ovate, 1.5–2.3 × 1–1.3 mm; wingless; cotyledons incumbent. |
ovoid, 1.5–2 × 1–1.5 mm; wingless; cotyledons incumbent. |
2n | =32, 64. |
=16. |
Lepidium draba |
Lepidium appelianum |
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Distribution | ||
Discussion | Disturbed areas, fields, riverbanks. Flowering Apr–Aug. 0–1700 m. BR, BW, Col, ECas, Owy, Sisk, WV. CA, ID, NV, WA; throughout North America except northern Canada and southeast US; nearly worldwide. Exotic. |
Sagebrush communities, alkaline meadows, fields, pastures, roadsides, streamsides. Flowering May–Sep. 100–1700 m. BR, BW, Col, ECas, Lava, Owy, WV. CA, ID, NV, WA; southern Canada, northern and western US; Asia, 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 | Cardaria draba, Cardaria draba var. draba, Lepidium draba ssp. draba | Cardaria pubescens, Cardaria pubescens var. elongata, Hymenophysa pubescens |
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