84. Boechera quebecensis Windham & Al-Shehbaz, Harvard Pap. Bot. 12: 246. 2007. TYPE: Canada, Quebec, Rimouski Co.: cold and shaded limestone and limestone-conglomerate ridges from Pinte aux Corbeaux to Cape Caribou, Bic, 8 Jul 1907, M. L. Fernald & J. F. Collins 1061 (holotype, GH!; isotypes, 3GH!, CAN!).
Arabis divaricarpa A. Nelson var. dechamplainii B. Boivin, Naturaliste Can. 94: 645. 1967. TYPE: Canada, Quebec, Comte de Rimouski, rochers maritimes calcarires, Cap au Corbeau, Bic, 17 Jul 1947, A. A. De Champlain 1577 (holotype, DAO!; isotype, MT).
Plants short-lived perennials or biennials, with or without caudices, lacking crowded, persistent leaf bases; apomictic, with spheroid pollen. Stems usually 1 per caudex branch, arising near ground surface from center of basal rosettes, 1.0–4.5 dm, lower parts with many sessile, 2–4-rayed trichomes 0.15–0.5 mm, upper parts glabrous. Leaves at stem bases oblanceolate, 5–15 mm wide, denticulate, ciliate proximally with simple trichomes to 1 mm, blade surfaces moderately pubescent with subsessile, (2–)3–7-rayed trichomes 0.1–0.3 mm; cauline leaves 4–15, not concealing stem, the uppermost glabrous, with auricles 1.0–3.5 mm. Inflorescences mostly unbranched, 11–41-flowered; fruiting pedicels 3–8(–14) mm, horizontal to slightly descending, curved to straight, glabrous or with few subappressed, branched trichomes. Flowers divaricate at anthesis; sepals pubescent; petals white, 6–7 ´ 1–2 mm, glabrous; ovules 56–94 per fruit. Fruits 3–6 cm ´ 1.5–2.0 mm, horizontal to slightly descending, not appressed to rachises, secund, straight, with parallel edges, glabrous. Seeds uniseriate, 1.2–1.5 ´ 1.0–1.3 mm; wing continuous, 0.10–0.15 mm wide.
Habitat: calcareous rock outcrops and talus slopes.
Elevation: 0−300 m.
Distribution: Canada (Quebec).
Reproductive mode: apomictic triploid.