Boechera subpinnatifida |
Boechera pinetorum |
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ashy rockcress |
Holboell's rockcress, woodland rockcress |
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Habit | Plants long-lived perennial; with woody caudices. | Plants short-lived perennial; with non-woody caudices. |
Stems | 1–4(5) dm; lower parts with short-stalked, 2–6-rayed trichomes; upper parts sparsely pubescent. |
2–8(9.6) dm; lower parts with many simple and short-stalked, 2–4-rayed trichomes; upper parts sparsely pubescent or 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, 2–8(11) mm wide; margins entire or denticulate, ciliate proximally with simple trichomes; surfaces sparsely to densely pubescent with short-stalked, 2–5-rayed trichomes mixed with fewer simple trichomes. |
Cauline leaves | (10)20–60, often concealing stem throughout, bases uppermost auriculate and sparsely to moderately pubescent. |
7–33, often concealing stem proximally, bases auriculate; uppermost sparsely pubescent or glabrous. |
Inflorescences | 8–30-flowered, fruiting pedicels reflexed, strongly recurved, 5–15 mm, with appressed, branched trichomes. |
15–63-flowered, fruiting pedicels reflexed, abruptly recurved near bases, 4–12 mm, glabrous or with few spreading; simple and 2-rayed trichomes. |
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. |
apomictic, divaricate to pendent at anthesis; sepals pubescent; petals 5–6 × 1–1.5 mm, white to lavender; pollen spheroid; ovules 70–110 per ovary; styles 0.05–0.4 mm. |
Fruits | pendent, not appressed to rachis, not secund; straight to slightly curved; (3.5)5–8 cm × 2–3 mm; margins parallel, pubescent. |
reflexed to closely pendent, not appressed to rachis, not secund; straight or curved; (4.5)5.5–8.5 cm × 1.5–2 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, 1.5–1.8 × 1.2–1.5 mm; wings continuous, 0.15–0.3 mm wide. |
2n | =14. |
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Boechera subpinnatifida |
Boechera pinetorum |
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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. |
Rock outcrops and gravelly soil in meadows and open conifer forests. Flowering May–Sep. 400–1700 m. BW, Lava, Owy, Sisk. CA, ID, NV, WA. Native. |
Source | Flora of Oregon, volume 2, page 457 Ihsan Al-Shehbaz |
Flora of Oregon, volume 2, page 455 Ihsan Al-Shehbaz |
Sibling taxa | ||
Synonyms | Arabis subpinnatifida | Arabis holboellii, Arabis holboellii var. pinetorum, Boechera holboellii |
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