Boechera subpinnatifida |
Boechera lyallii |
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ashy rockcress |
Lyall's slender rockcress |
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Habit | Plants long-lived perennial; with woody caudices. | Plants long-lived perennial, cespitose; with woody caudices. |
Stems | 1–4(5) dm; lower parts with short-stalked, 2–6-rayed trichomes; upper parts sparsely pubescent. |
0.3–1.5(2) 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. |
linear-oblanceolate, 1–5(8) mm wide; margins entire, usually ciliate at least proximally with simple and/or short-stalked, 2- or 3-rayed trichomes, or rarely youngest leaves of sterile shoots pubescent with 4–6-rayed trichomes; margins with stalked trichomes. |
Cauline leaves | (10)20–60, often concealing stem throughout, bases uppermost auriculate and sparsely to moderately pubescent. |
1–5, mostly not concealing stem, bases auriculate or rarely not, glabrous. |
Inflorescences | 8–30-flowered, fruiting pedicels reflexed, strongly recurved, 5–15 mm, with appressed, branched trichomes. |
2–10(15)-flowered, fruiting pedicels erect; straight, 3–8(15) 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 or apomictic; erect at anthesis; sepals glabrous; petals 6–8.5 × 1.5–3 mm, white to lavender; sexual pollen ellipsoid, apomictic pollen spheroid; ovules 34–64 per ovary; styles 0.1–0.7 mm. |
Fruits | pendent, not appressed to rachis, not secund; straight to slightly curved; (3.5)5–8 cm × 2–3 mm; margins parallel, pubescent. |
erect, appressed to rachis, not secund; straight, 3–5.6 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. |
subbiseriate, 1.5–2 × 1–1.5 mm; wings continuous, 0.3–0.5 mm wide. |
2n | =14. |
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Boechera subpinnatifida |
Boechera lyallii |
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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. |
Talus slopes, cliffs, gravelly soil in alpine and subalpine habitats. Flowering Jun–Aug. 1700–3000 m. BR, BW, Casc. CA, ID, NV, WA; north to Yukon, northeast to MT, southeast to UT. 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 lyallii, Arabis lyallii var. lyallii |
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