Boechera subpinnatifida |
Boechera koehleri |
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ashy rockcress |
shrubby rockcress |
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Habit | Plants long-lived perennial; with woody caudices. | Plants long-lived perennial, sometimes subshrubs; with woody caudices. |
Stems | 1–4(5) dm; lower parts with short-stalked, 2–6-rayed trichomes; upper parts sparsely pubescent. |
0.8–4.5 dm; lower parts with stalked; simple and 2–4-rayed trichomes; upper parts 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. |
narrowly oblanceolate, 1–3 mm wide; margins entire, ciliate proximally with simple trichomes to 1 mm; surfaces moderately to sparsely pubescent with simple and stalked, 2–4-rayed trichomes. |
Cauline leaves | (10)20–60, often concealing stem throughout, bases uppermost auriculate and sparsely to moderately pubescent. |
3–17(30), rarely concealing stem, bases auriculate; uppermost glabrous. |
Inflorescences | 8–30-flowered, fruiting pedicels reflexed, strongly recurved, 5–15 mm, with appressed, branched trichomes. |
6–20(35)-flowered, fruiting pedicels divaricate-ascending to horizontal; straight, 10–18 mm, glabrous or with few appressed, branched 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. |
sexual, ascending at anthesis; sepals pubescent; petals 8–12 × 2.5–4 mm, purple to magenta; pollen ellipsoid; ovules 58–94 per ovary; styles 0.05–0.2 mm. |
Fruits | pendent, not appressed to rachis, not secund; straight to slightly curved; (3.5)5–8 cm × 2–3 mm; margins parallel, pubescent. |
divaricate-ascending to widely pendent, not appressed to rachis, not secund, curved or rarely straight, 5–7.5 cm × 1.8–2.5 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, 1.3–1.8 × 1.2–1.5 mm; wings continuous, 0.1–0.2 mm wide. |
2n | =14. |
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Boechera subpinnatifida |
Boechera koehleri |
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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. |
Serpentine and limestone outcrops. Flowering Mar–Jun. 100–1300 m. Sisk. CA. Native. |
Source | Flora of Oregon, volume 2, page 457 Ihsan Al-Shehbaz |
Flora of Oregon, volume 2, page 453 Ihsan Al-Shehbaz |
Sibling taxa | ||
Synonyms | Arabis subpinnatifida | Arabis koehleri var. koehleri, Arabis koehleri var. stipitata |
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