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Boechera subpinnatifida

ashy rockcress

Davidson's rockcress

Habit Plants long-lived perennial; with woody caudices. Plants long-lived perennial, cespitose; caudices woody; branches thickly covered by crowded, persistent leaf bases.
Stems

1–4(5) dm; lower parts with short-stalked, 2–6-rayed trichomes; upper parts sparsely pubescent.

usually 0.6–2.3 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, 3.5–14 mm wide;

margins entire or rarely slightly dentate, not ciliate;

surfaces glabrous.

Cauline leaves

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

3–10, not concealing stem, not auriculate, glabrous.

Inflorescences

8–30-flowered, fruiting pedicels reflexed, strongly recurved, 5–15 mm, with appressed, branched trichomes.

4–24-flowered, fruiting pedicels ascending; straight, 3–18 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, ascending at anthesis;

sepals glabrous;

petals 6–10 × 2.5–4 mm, white to lavender;

claws entire;

stamens tetradynamous;

pollen ellipsoid;

ovules 28–50 per ovary;

styles 0.1–0.5(0.8) mm.

Fruits

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

margins parallel, pubescent.

ascending to divaricate-ascending, not appressed to rachis, not secund; straight to slightly curved, 2.5–7 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.

uniseriate, 1.8–2.2 × 0.8–1.7 mm;

wings distal or continuous, 0.1–0.5 mm wide.

2n

=14.

Boechera subpinnatifida

Boechera davidsonii

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.

Ledges, crevices of rock outcrops. Flowering Apr–Jul. 1200–2500 m. BW. CA, NV. Native.

Source Flora of Oregon, volume 2, page 457
Ihsan Al-Shehbaz
Flora of Oregon, volume 2, page 451
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. 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, B. suffrutescens
Synonyms Arabis subpinnatifida Arabis davidsonii
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