Arabis georgiana
Arabis olympica
Georgia rockcress
Olympics rockcress
simple or few from base (rosette), erect, unbranched or branched (few) distally, 3–7 dm, (hirsute basally, glabrous distally).
simple or few from base (caudex), erect, unbranched, 0.7–1.1 dm, (pubescent throughout, trichomes short-stalked, forked).
petiole 0.5–2 cm, (ciliate or not);
blade spatulate, oblanceolate, or obovate, 1.5–6 cm × 5–15 mm, margins dentate, apex obtuse or acute, abaxial surface moderately to sparsely pubescent, trichomes subsessile stellate, adaxial surface subglabrate or sparsely stellate.
petiole 0.3–0.6 cm, (sparsely ciliate);
blades oblanceolate to obovate, 0.4–1cm × 2–7 mm, margins entire or repand, (ciliate), apex obtuse, surfaces sparsely pubescent, trichomes simple and forked.
7–26;
blade oblong, lanceolate, or linear-lanceolate, 1.5–7 cm × 3–18 mm, base auriculate to subamplexicaul, margins dentate or entire, apex acute or obtuse, pubescent as basal leaves except distalmost leaves often glabrous.
4–6;
blade oblong, 0.6–0.8 cm × 2–3 mm, base not auriculate, margins entire, (ciliate), apex obtuse.
often simple.
simple, (dense).
sepals oblong, 2.5–4.5 × 1–1.5 mm, lateral pair subsaccate basally;
petals white, narrowly spatulate or oblanceolate, 6–9 × 1–1.5 mm, apex obtuse;
filaments 3–4.5 mm;
anthers oblong, 0.8–1 mm.
sepals (greenish), ovate, 1.5 × 0.5 mm, lateral pair not saccate basally, (glabrous);
petals white, oblanceolate, 3.5–4 × 1 mm, apex rounded.
erect to erect-ascending, 7–16 mm, (glabrous).
erect, (subappressed to rachis), 5–6.5 mm, (glabrous).
erect to erect-ascending, (often subappressed to rachis), smooth, 4–7 cm × 0.7–0.8 mm;
valves each with midvein extending full length or to middle;
ovules 38–44 per ovary;
style 0.7–1.8 mm.
erect, (appressed to rachis), slightly torulose, 2–2.3 cm × 1 mm;
valves each with distinct midvein extending full length;
ovules 28–34 per ovary;
style 0.2–0.3 mm, (stout).
narrowly winged throughout, oblong, 0.9–1.9 × 0.5–0.7 mm;
wing to 0.1 mm wide distally.
winged distally, oblong, ca. 1 × 0.5 mm;
wing ca. 0.1 mm wide.
Arabis georgiana
Arabis olympica
Of conservation concern.
Arabis georgiana is most closely related to A. pycnocarpa, from which it is easily distinguished by having narrower fruits, longer petals, and subsessile cruciform or 3-rayed trichomes on abaxial surfaces of basal leaves. It is known only in Alabama from Bibb and Elmore counties and in Georgia from Stewart County.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Arabis olympica, which is known from two collections, J. B. Flett s.n. (holotype, US; isotype, WS) and N. Buckingham 1577 (WS) that were made from Jefferson and Clallam counties, respectively, was reduced by R. C. Rollins (1936, 1941, 1993) to a variety of A. furcata. An examination of the type collections of both species reveals that they are distinct. Although the fruits and seeds of A. olympica are not fully mature, they are clearly different in width and orientation from those of A. furcata at the same developmental stage. The striking differences in fruit width and orientation, stem indument, and seed and flower size support their maintenance as distinct species. Although both species grow in Washington, the range of A. olympica seems to be restricted to Clallam and Jefferson counties and is disjunct from Chelan, Kittitas, and Yakima counties, where A. furcata grows.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
WildflowerSearch
iNaturalist
USDA Plants Database
WA
Flora NW
PNW Herbaria
