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globe-pod hoary-cress, hairy whitetop, white-top

Barneby's pepperweed

Habit Perennials; (rhizomatous); often densely hirsute. Perennials; (cespitose, caudex thick, woody, numerous-branched, with persistent petiolar remains); puberulent.
Stems

simple or several from base, erect or ascending, branched distally, (1–)1.5–3.5(–5) dm.

simple or few from base (caudex), erect to ascending, unbranched or branched distally, (0.3–)0.5–1.5(–1.7) dm.

Basal leaves

(often withered by anthesis);

not rosulate;

petiole 0.5–1.5 cm;

blade obovate to oblanceolate, (1–)2–6(–7) cm × 3–20 mm, margins dentate to sinuate.

not rosulate;

petiole 0.3–0.8 cm, (papery);

blade linear, (0.5–)1–7(–8) cm × 10–36 mm, margins entire.

Cauline leaves

sessile;

blade oblong or lanceolate, 1–5(–8) cm × (3–)5–15(–30) mm, base sagittate, margins dentate or subentire, (surfaces pubescent).

sessile;

blade linear, base attenuate, not auriculate, margins entire, (similar to basal, smaller distally).

Racemes

(usually corymbose, rarely paniculate), rarely elongated in fruit;

rachis pubescent, trichomes often curved.

slightly elongated in fruit;

rachis puberulent, trichomes straight.

Flowers

sepals oblong, 1.4–2 × 0.7–1 mm;

petals white, broadly obovate, (2.2–)2.8–4 × 1–3 mm, claw 1–1.4 mm;

stamens 6;

filaments 2–2.5 mm, (glabrous);

anthers 0.4–0.5 mm.

sepals (sometimes somewhat persistent), oblong-obovate, 1.8–2.8 × 1.3–1.8 mm;

petals white to pale yellow, suborbicular to broadly obovate, 3.2–4.6 × 2.5–3.2 mm, claw 0.5–1.5 mm;

stamens 6;

filaments 1.8–2.6 mm, (glabrous);

anthers 0.5–0.8 mm.

Fruiting pedicels

divaricate to ascending, straight or slightly curved, (terete), 3–9(–12) × 0.2–0.3 mm, pubescent.

divaricate-ascending, straight, (terete), 3–8 × 0.3–0.4 mm, puberulent throughout.

Fruits

(indehiscent), globose or, rarely, subglobose, (2–)3–4.4(–5) mm diam., (inflated), apically not winged, apical notch absent;

valves thin, smooth, not veined, densely puberulent;

style 0.5–1.5 mm.

ovate, 4–5.5(–6.2) × 3–3.8 mm, apically winged, apical notch 0–0.2 mm deep;

valves thin, smooth, not veined, glabrous;

style 0.5–1.2 mm, exserted beyond apical notch.

Seeds

(brown or dark brown), ovoid, 1.5–2 × 1–1.5 mm.

ovate, 2.2–2.8 × 1.4–1.6 mm.

2n

= 16.

Lepidium appelianum

Lepidium barnebyanum

Phenology Flowering May–Sep. Flowering May–Jun.
Habitat Roadsides, sagebrush communities, alkaline meadows, waste grounds, ditch and stream sides, fields, pastures Pinyon-juniper and sagebrush communities, white sandy shale
Elevation 400-2400 m (1300-7900 ft) 1800-2000 m (5900-6600 ft)
Distribution
from FNA
CA; CO; ID; MI; MO; MT; ND; NE; NM; NV; OR; PA; UT; WA; WI; WY; AB; BC; MB; SK; c Asia [Introduced in North America; introduced also in South America, other parts of Asia]
[WildflowerSearch map]
[BONAP county map]
from FNA
UT
[BONAP county map]
Discussion

Lepidium appelianum has become a noxious weed in most of its range in North America.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Of conservation concern.

Lepidium barnebyanum is known from the Green River and Uinta Shale Formations in Duchesne County. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 7, p. 576. FNA vol. 7, p. 576.
Parent taxa Brassicaceae > tribe Lepidieae > Lepidium Brassicaceae > tribe Lepidieae > Lepidium
Sibling taxa
L. acutidens, L. alyssoides, L. austrinum, L. barnebyanum, L. campestre, L. chalepense, L. coronopus, L. crenatum, L. davisii, L. densiflorum, L. dictyotum, L. didymum, L. draba, L. eastwoodiae, L. flavum, L. fremontii, L. heterophyllum, L. huberi, L. integrifolium, L. jaredii, L. lasiocarpum, L. latifolium, L. latipes, L. montanum, L. nanum, L. nitidum, L. oblongum, L. ostleri, L. oxycarpum, L. papilliferum, L. paysonii, L. perfoliatum, L. pinnatifidum, L. ramosissimum, L. ruderale, L. sativum, L. sordidum, L. strictum, L. thurberi, L. tiehmii, L. virginicum
L. acutidens, L. alyssoides, L. appelianum, L. austrinum, L. campestre, L. chalepense, L. coronopus, L. crenatum, L. davisii, L. densiflorum, L. dictyotum, L. didymum, L. draba, L. eastwoodiae, L. flavum, L. fremontii, L. heterophyllum, L. huberi, L. integrifolium, L. jaredii, L. lasiocarpum, L. latifolium, L. latipes, L. montanum, L. nanum, L. nitidum, L. oblongum, L. ostleri, L. oxycarpum, L. papilliferum, L. paysonii, L. perfoliatum, L. pinnatifidum, L. ramosissimum, L. ruderale, L. sativum, L. sordidum, L. strictum, L. thurberi, L. tiehmii, L. virginicum
Synonyms Hymenophysa pubescens, Cardaria pubescens, Cardaria pubescens var. elongata L. montanum subsp. demissum
Name authority Al-Shehbaz: Novon 12: 7. (2002) Reveal: Great Basin Naturalist 27: 178. (1967)
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