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Boechera subpinnatifida

ashy rockcress

meadow rockcress

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.

Boechera subpinnatifida

Boechera pratincola

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, 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
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. puberula, B. rectissima, B. retrofracta, B. rollei, B. sparsiflora, B. stricta, B. subpinnatifida, B. suffrutescens
Synonyms Arabis subpinnatifida Arabis x divaricarpa
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