Arabis crucisetosa |
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cross-hair rock-cress, wetsoil rock-cress |
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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 |
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Phenology | Flowering Apr–Jun. |
Habitat | Open woods, rocky bluffs, steep banks, canyon margins |
Elevation | 400-1800 m (1300-5900 ft) |
Distribution |
ID; OR; WA
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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 | |
Sibling taxa | |
Name authority | Constance & Rollins: Proc. Biol. Soc. Wash. 49: 147. (1936) |
Web links |