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FNA | Family List | FNA Vol. 7 | Brassicaceae | Boechera

9. Boechera canadensis (Linnaeus) Al-Shehbaz, Novon. 13: 384. 2003.

Arabis canadensis Linnaeus, Sp. Pl. 2: 665, 1200. 1753; A. falcata Michaux; A. hirsuta (Linnaeus) Scopoli var. ovata (Pursh) Torrey & A. Gray; A. ovata (Pursh) Poiret

Biennials; short-lived; sexual; caudex not evident. Stems 1 per plant, arising from center of rosette near ground surface, 2.5-10(-12.5) dm, sparsely to densely pubescent proximally, trichomes simple, to 1 mm, glabrous or sparsely pubescent distally. Basal leaves: blade obovate to oblanceolate, 10-30 mm wide, margins dentate, ciliate proximally, trichomes simple, to 1 mm, surfaces moderately pubescent, trichomes simple, 0.5-1.5 mm, these mixed with smaller, 2- or 3-rayed ones. Cauline leaves: 12-20, often concealing stem proximally; blade auricles absent or proximalmost blades with auricles 0.5-2(-5) mm, surfaces of distalmost leaves sparsely pubescent. Racemes 15-65(-82)-flowered, sometimes branched. Fruiting pedicels descending to horizontal, usually curved, rarely straight, 6-13(-17) mm, pubescent or glabrous, trichomes subappressed, usually 2-rayed. Flowers divaricate-ascending to horizontal at anthesis; sepals pubescent; petals white, 3-5 × 0.7-1.2 mm, glabrous; pollen ellipsoid. Fruits pendent to horizontal, not appressed to rachis, often secund, curved, edges parallel, 4-10 cm × 2.5-4 mm; valves glabrous; ovules 40-62 per ovary; style 0.3-0.8(-1.1) mm. Seeds uniseriate, 1.7-3.5 × 1.5-2.2 mm; wing continuous, 0.4-1 mm wide distally. 2n = 14.

Flowering Apr-Jul. Bluffs, rocky slopes, ravines, open woods; 0-1200 m; Que.; Ala., Ark., Conn., D.C., Fla., Ga., Ill., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.Y., N.C., Ohio, Okla., Pa., Tenn., Tex., Vt., Va., W.Va., Wis.


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