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cross-hair rock-cress, wetsoil rock-cress

Habit Perennials; (caudex usually simple, rarely branched, covered with persistent petiolar remains); sparsely to densely pubescent basally, trichomes short-stalked, cruciform or 3-rayed, stellate, (to 0.4 mm in diam.).
Stems

simple or few from caudex, erect, unbranched or rarely branched (few) distally, (1–)1.5–4(–5) dm, (glabrous throughout or sparsely pubescent proximally).

Basal leaves

petiole 0.5–2.5(–3) cm;

blade oblanceolate to obovate, (0.6–)1–3.5(–4.5) cm × (3–)5–15(–20) mm, margins entire or dentate, (not ciliate), apex obtuse, surfaces uniformly pubescent, trichomes short-stalked, stellate.

Cauline leaves

3 or 4(–6);

blade linear, oblong or oblanceolate, 1–3(–4) cm × (1.5–)3–7(–10) mm, base cuneate, not auriculate, margins usually entire, rarely few-toothed, apex obtuse, surfaces glabrous or sparsely pubescent at least along margin.

Racemes

simple.

Flowers

sepals (greenish), oblong, 2.5–4 × 1–1.5 mm, lateral pair saccate basally;

petals white, oblanceolate, 7–9 × 2.5–3.5 mm, apex rounded;

filaments 2.5–4 mm;

anthers oblong, 0.8–1 mm; (gynophore to 0.5 mm).

Fruiting pedicels

ascending to divaricate, (5–)8–20 mm, (glabrous).

Fruits

divaricate, slightly torulose, sometimes slightly curved, slightly flattened, (1.3–)1.7–3.5(–4) cm × 1–1.5 mm;

valves each with obscure midvein extending to middle;

ovules 14–28 per ovary;

style 0.5–1.3 mm.

Seeds

not winged, oblong, 1–1.2 × 0.5–0.6 mm.

2n

= 32.

Arabis crucisetosa

Phenology Flowering Apr–Jun.
Habitat Open woods, rocky bluffs, steep banks, canyon margins
Elevation 400-1800 m (1300-5900 ft)
Distribution
from FNA
ID; OR; WA
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[BONAP county map]
Discussion

Arabis crucisetosa is known from Idaho, Lewis, and Nez Perce counties in Idaho, from Wallowa County in Oregon, and from Asotin County in Washington.

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

Source FNA vol. 7, p. 262.
Parent taxa Brassicaceae > tribe Arabideae > Arabis
Sibling taxa
A. aculeolata, A. alpina, A. blepharophylla, A. caucasica, A. eschscholtziana, A. furcata, A. georgiana, A. mcdonaldiana, A. modesta, A. nuttallii, A. olympica, A. oregana, A. patens, A. pycnocarpa
Name authority Constance & Rollins: Proc. Biol. Soc. Wash. 49: 147. (1936)
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