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Boechera subpinnatifida

ashy rockcress

woody 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.

1–4(5) dm; lower parts glabrous or rarely with short-stalked, 2-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, 1.5–6 mm wide;

margins entire, not ciliate or rarely with simple trichomes;

surfaces glabrous or sparsely to densely pubescent with short-stalked, 2–6-rayed trichomes.

Cauline leaves

(10)20–60, often concealing stem throughout, bases uppermost auriculate and sparsely to moderately pubescent.

(4)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.

6–12-flowered, fruiting pedicels reflexed, usually abruptly recurved at bases but otherwise straight, 4–18 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, pendent at anthesis;

sepals glabrous;

petals 4.5–6 × 2–2.5 mm, purple or whitish with rose tips; sexual pollen ellipsoid, apomictic pollen spheroid;

ovules 20–30 per ovary;

styles 0.4–1.2 mm.

Fruits

pendent, not appressed to rachis, not secund; straight to slightly curved; (3.5)5–8 cm × 2–3 mm;

margins parallel, pubescent.

reflexed to closely pendent, occasionally appressed to rachis, often secund; straight to somewhat curved, 3–7(8) cm × 3–6 mm;

margins undulate and non-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, 2.5–5.5 × 1.8–3.5 mm;

wings continuous, 0.8–1.5 mm wide.

2n

=14.

Boechera subpinnatifida

Boechera suffrutescens

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch 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.

Rocky slopes, gravelly soil, sagebrush communities. Flowering Jun–Aug. 1600–2400 m. BR, BW, ECas. CA, ID, NV, WA. Native.

Source Flora of Oregon, volume 2, page 457
Ihsan Al-Shehbaz
Flora of Oregon, volume 2, page 457
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. rollei, B. sparsiflora, B. stricta, B. subpinnatifida
Synonyms Arabis subpinnatifida Arabis suffrutescens, Arabis suffrutescens var. suffrutescens
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