Arabis blepharophylla
Arabis nuttallii
coast rock cress, rose rockcress
Nuttall's rockcress
simple or few from base (caudex), erect, unbranched or branched (few) distally, 0.6–2.5(–3) dm, (usually pubescent throughout, rarely subglabrate).
simple or few to numerous from base (caudex), erect or ascending, unbranched, 0.5–2.5(–3.6) dm, (glabrous throughout or pubescent along proximal 1/2, trichomes simple).
petiole 0.5–3(–6) cm, (ciliate);
blade oblanceolate, spatulate, or obovate, (1.5–)2.1–3.5(–6) cm × (5–)8–20(–25) mm, margins entire or dentate, (ciliate), apex obtuse, surfaces pubescent or glabrous, trichomes simple and forked, sometimes mixed with 3- or 4-rayed stellate ones.
petiole 0.3–2(–3.5) cm, (glabrous or ciliate);
blade narrowly oblanceolate, spatulate, to obovate, 0.4–2(–3) cm × 3–10(–15) mm, margins entire, (ciliate or not), apex obtuse, surfaces glabrous or sparsely to densely pubescent, trichomes simple, rarely mixed with forked ones.
(2 or) 3–6 (or 7);
blade oblong or ovate, 1–2(–4) cm × (2–)4–10(–15) mm, base not auriculate, margins entire or dentate, (ciliate), apex obtuse, surfaces pubescent as basal leaves.
(1 or) 2–5(–7);
blade linear, oblanceolate, oblong, or obovate, 0.5–2.2(–3) cm × 2–8(–12) mm, base not auriculate, margins entire, (sometimes ciliate), apex obtuse, surfaces glabrous or, rarely, sparsely pubescent.
simple, (dense).
simple, (dense or lax).
sepals (purple), oblong, 5–7 × 1.5–2 mm, lateral pair saccate basally;
petals purple, spatulate or broadly so, (12–)14–18 × 4–7 mm, apex obtuse or rounded;
filaments 6–8 mm;
anthers narrowly oblong, 1.2–1.5 mm.
sepals (greenish) oblong, 2.5–3.5 × 1.2–1.5 mm, lateral pair saccate basally, (glabrous);
petals white, oblanceolate to spatulate, (5–)6–8 × 2–4 mm, apex rounded;
filaments 2.5–4 mm;
anthers oblong, 0.6–1 mm.
ascending to erect, (3–)5–10(–15) mm.
ascending to divaricate, (2–)5–20(–30) mm, (glabrous).
erect or nearly so, slightly torulose, 2–4 cm × 2–3 mm;
valves each with prominent midvein extending full length or rarely to middle;
ovules 20–28 per ovary;
style 0.2–1(–1.5) mm.
ascending to suberect, (not appressed to rachis), slightly torulose, sometimes slightly curved, (0.7–)1–2.5(–2.8) cm × 0.8–1.2(–1.5) mm;
valves each with distinct midvein extending full length;
ovules 10–24 per ovary;
style 0.5–1.2(–2) mm, (slender).
narrowly winged throughout, orbicular or suborbicular, 2–2.5 mm in diam.;
wing 0.2–0.4 mm wide (wider distally).
not winged, broadly ovate, 0.6–1.2(–1.5) × 0.5–1 mm.
= 16.
= 32.
Arabis blepharophylla
Arabis nuttallii
Arabis blepharophylla is an attractive species on the gradual increase in cultivation as an ornamental. It is recorded from Contra Costa, Marin, San Francisco, San Mateo, Santa Cruz, and Sonoma counties; most of the records are based on older collections.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Arabis nuttallii, the second most widespread native North American species of the genus, is variable in density of indumentum, types of trichomes, plant height, pedicel length, fruit width, leaf shape, flowering and fruiting time, and elevation. As indicated by R. C. Rollins (1941, 1993), the variation seems to be sporadic and does not correlate with clear-cut entities and, therefore, the species cannot be subdivided meaningfully.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
WildflowerSearch
iNaturalist
USDA Plants Database
BC
WA
Flora NW
PNW Herbaria
