Boechera subpinnatifida |
Boechera rollei |
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ashy rockcress |
Rolle's rockcress |
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Habit | Plants long-lived perennial; with woody caudices. | Plants long-lived perennial; with woody caudices. |
Stems | 1–4(5) dm; lower parts with short-stalked, 2–6-rayed trichomes; upper parts sparsely pubescent. |
1.5–2.5 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, 3–8 mm wide; margins entire, ciliate proximally with simple trichomes 0.2–0.7 mm; surfaces glabrous or sparsely pubescent with short-stalked, 2–4-rayed trichomes. |
Cauline leaves | (10)20–60, often concealing stem throughout, bases uppermost auriculate and sparsely to moderately pubescent. |
6–12, occasionally concealing stem proximally, bases auriculate; uppermost glabrous. |
Inflorescences | 8–30-flowered, fruiting pedicels reflexed, strongly recurved, 5–15 mm, with appressed, branched trichomes. |
3–7-flowered, fruiting pedicels reflexed, not geniculate at base, 4–6 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 to descending at anthesis; sepals glabrous; petals 8–11 × 2–2.5 mm, white to lavender; pollen ellipsoid; ovules 14–22 per ovary. |
Fruits | pendent, not appressed to rachis, not secund; straight to slightly curved; (3.5)5–8 cm × 2–3 mm; margins parallel, pubescent. |
pendent, not appressed to rachis, not secund; straight to slightly curved, 3.5–6 cm × 2.5–3.5 mm; margins undulate, 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, 3–4 × 1.5–2 mm; wings distal and proximal, 0.3–0.6 mm wide. |
2n | =14. |
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Boechera subpinnatifida |
Boechera rollei |
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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. |
Peridotite rocks on sparsely forested slopes. Flowering Aug. 1600–1800 m. Sisk. CA. Native. |
Source | Flora of Oregon, volume 2, page 457 Ihsan Al-Shehbaz |
Flora of Oregon, volume 2, page 456 Ihsan Al-Shehbaz |
Sibling taxa | ||
Synonyms | Arabis subpinnatifida | |
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