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Boechera subpinnatifida

ashy rockcress

Rolle's rockcress

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.

Boechera subpinnatifida

Boechera rollei

Distribution
[WildflowerSearch map]
[BONAP county map]
[BONAP county map]
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
B. acutina, B. atrorubens, B. breweri, B. calderi, B. cascadensis, B. cobrensis, B. covillei, B. cusickii, B. davidsonii, B. divaricarpa, B. drepanoloba, B. hastatula, B. horizontalis, B. howellii, B. koehleri, B. lemmonii, B. lyallii, B. microphylla, B. paddoensis, B. pauciflora, B. paupercula, B. pendulocarpa, B. pinetorum, B. platysperma, B. pratincola, B. puberula, B. rectissima, B. retrofracta, B. rollei, B. sparsiflora, B. stricta, B. suffrutescens
B. acutina, B. atrorubens, B. breweri, B. calderi, B. cascadensis, B. cobrensis, B. covillei, B. cusickii, B. davidsonii, B. divaricarpa, B. drepanoloba, B. hastatula, B. horizontalis, B. howellii, B. koehleri, B. lemmonii, B. lyallii, B. microphylla, B. paddoensis, B. pauciflora, B. paupercula, B. pendulocarpa, B. pinetorum, B. platysperma, B. pratincola, B. puberula, B. rectissima, B. retrofracta, B. sparsiflora, B. stricta, B. subpinnatifida, B. suffrutescens
Synonyms Arabis subpinnatifida
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