Boechera subpinnatifida |
Boechera davidsonii |
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ashy rockcress |
Davidson's rockcress |
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Habit | Plants long-lived perennial; with woody caudices. | Plants long-lived perennial, cespitose; caudices woody; branches thickly covered by crowded, persistent leaf bases. |
Stems | 1–4(5) dm; lower parts with short-stalked, 2–6-rayed trichomes; upper parts sparsely pubescent. |
usually 0.6–2.3 dm, glabrous. |
Basal leaves | narrowly oblanceolate, 1–4(5) mm wide; margins prominently dentate to subpinnatifid; entire on those of sterile shoots; surfaces densely pubescent with short-stalked; (2)4–9-rayed trichomes, ciliate near petiole bases with simple or 2-rayed trichomes. |
oblanceolate, 3.5–14 mm wide; margins entire or rarely slightly dentate, not ciliate; surfaces glabrous. |
Cauline leaves | (10)20–60, often concealing stem throughout, bases uppermost auriculate and sparsely to moderately pubescent. |
3–10, not concealing stem, not auriculate, glabrous. |
Inflorescences | 8–30-flowered, fruiting pedicels reflexed, strongly recurved, 5–15 mm, with appressed, branched trichomes. |
4–24-flowered, fruiting pedicels ascending; straight, 3–18 mm, glabrous. |
Flowers | sexual, divaricate-ascending to pendent at anthesis; sepals glabrous; petals 9–14 × 1.5–3 mm, purple or rarely lavender; pollen ellipsoid; ovules 24–42 per ovary; styles 0.5–1 mm. |
sexual, ascending at anthesis; sepals glabrous; petals 6–10 × 2.5–4 mm, white to lavender; claws entire; stamens tetradynamous; pollen ellipsoid; ovules 28–50 per ovary; styles 0.1–0.5(0.8) mm. |
Fruits | pendent, not appressed to rachis, not secund; straight to slightly curved; (3.5)5–8 cm × 2–3 mm; margins parallel, pubescent. |
ascending to divaricate-ascending, not appressed to rachis, not secund; straight to slightly curved, 2.5–7 cm × 1.5–2.5 mm; margins parallel, glabrous. |
Seeds | uniseriate, 2.5–3.5 × 1.5–2.2 mm; wings continuous or at both ends, 0.4–0.8 mm wide. |
uniseriate, 1.8–2.2 × 0.8–1.7 mm; wings distal or continuous, 0.1–0.5 mm wide. |
2n | =14. |
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Boechera subpinnatifida |
Boechera davidsonii |
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Distribution | ||
Discussion | Talus, rock outcrops, gravelly soil, sagebrush-grassland communities. Flowering Mar–Jun. 100–1800 m. Lava, Sisk. CA, ID, NV; southeast to UT. Native. |
Ledges, crevices of rock outcrops. Flowering Apr–Jul. 1200–2500 m. BW. CA, NV. Native. |
Source | Flora of Oregon, volume 2, page 457 Ihsan Al-Shehbaz |
Flora of Oregon, volume 2, page 451 Ihsan Al-Shehbaz |
Sibling taxa | ||
Synonyms | Arabis subpinnatifida | Arabis davidsonii |
Web links |
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