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Boechera subpinnatifida

ashy rockcress

shrubby rockcress

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.

Boechera subpinnatifida

Boechera koehleri

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.

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
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. 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, B. suffrutescens
Synonyms Arabis subpinnatifida Arabis koehleri var. koehleri, Arabis koehleri var. stipitata
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