Boechera subpinnatifida |
Boechera pratincola |
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ashy rockcress |
meadow rockcress |
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Habit | Plants long-lived perennial; with woody caudices. | Plants mostly short-lived perennial; with non-woody caudices lacking crowded, persistent leaf bases. |
Stems | 1–4(5) dm; lower parts with short-stalked, 2–6-rayed trichomes; upper parts sparsely pubescent. |
usually 2–6 dm; lower parts with sessile, 2- or 3-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. |
oblanceolate, 1.5–5(7) mm wide; margins entire or rarely denticulate; surfaces pubescent with sessile, 2–4(6)-rayed trichomes, ciliate at petiole bases. |
Cauline leaves | (10)20–60, often concealing stem throughout, bases uppermost auriculate and sparsely to moderately pubescent. |
(7)13–42, concealing stem proximally, bases auriculate; uppermost sparsely pubescent. |
Inflorescences | 8–30-flowered, fruiting pedicels reflexed, strongly recurved, 5–15 mm, with appressed, branched trichomes. |
(7)14–45-flowered; pedicels 5–12 mm; erect; straight, 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. |
apomictic, ascending at anthesis; sepals glabrous; petals 6–10 × 1.5–2 mm, lavender, glabrous; pollen spheroid; ovules 60–140 per ovary; styles 0.1–0.3 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, 4–6.5 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. |
subbiseriate, 1.4–2 × 1–1.4 mm; wings continuous, 0.1–0.35 mm wide. |
2n | =14. |
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Boechera subpinnatifida |
Boechera pratincola |
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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. |
Rocky slopes, soil patches in open areas, forest edges. Flowering Jun–Aug. 1500–2200 m. BW, Casc, Sisk. CA, ID, NV. 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 | Arabis x divaricarpa |
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