Tropicos | Name - Boechera canadensis (L.) Al-Shehbaz

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Boechera canadensis (L.) Al-Shehbaz

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9. Boechera canadensis (Linnaeus) Al-Shehbaz, Novon 13: 384. 2003; Arabis canadensis Linnaeus, Sp. Pl. 2: 665. 1753. TYPE: “Habitat in America septentrionali” [Lectotype designated by Reveal in Cafferty & Jarvis 2002: 531, Clayton 400, Herb. Linn. No. 842.12, left specimen (LINN; isolectotype, BM!)]

Arabis falcata Michaux, Fl. Bor.-Amer. 2: 31. 1803; not A. Richard, Tent. Fl. Abyss. 1: 17. 1847; nor (Turczaninow) Berkutenko, Bot. Zhurn. (Moscow & Leningrad) 61: 1597. 1976. TYPE: United States,

Arabis mollis Rafinesque, Amer. Monthly Mag. & Crit. Rev. 2: 43. 1817, not A. mollis Stevens, Mem. Soc. Nat. Mosc. 3: 270. 1812. TYPE: United States, not located.

Turritis ovata Pursh, Fl. Amer. Sept. 2: 438. 1814; A. ovata (Pursh) Poiret, Encycl. Suppl. 5: 557. 1817. Arabis hirsuta (Linnaeus) Scopoli var. ovata (Pursh) Torrey & A. Gray, Fl. N. Amer. 1: 80. 1838; TYPE: United States, not located.

Plants biennials, without evident caudices, lacking crowded, persistent leaf bases; sexual, with ellipsoid pollen. Stems 1 per plant, arising near ground surface from center of basal rosettes, 2.5–10.0(–12.5) dm, lower parts with few to many simple trichomes to 1 mm, upper parts glabrous or sparsely pubescent. Leaves at stem bases obovate to oblanceolate, 10–30 mm wide, dentate, ciliate proximally with simple trichomes to 1 mm, blade surfaces moderately pubescent with simple trichomes 0.5–1.5 mm, these mixed with smaller, 2–3-rayed trichomes; cauline leaves 12–20, pubescent, often concealing stem proximally, the uppermost sparsely pubescent, lacking auricles or the lowermost with auricles 0.5–2.0(–5.0) mm. Inflorescences occasionally branched, 15–65(–82)-flowered; fruiting pedicels 6–13(–17) mm, descending to horizontal, curved or rarely straight, with subappressed, mostly 2-rayed trichomes or glabrous. Flowers divaricate-ascending to horizontal at anthesis; sepals pubescent; petals white, 3–5 ´ 0.7–1.2 mm, glabrous; ovules 40–62 per fruit. Fruits 4–10 cm ´ 2.5–4.0 mm, pendent to horizontal, not appressed to rachises, often secund, curved, with parallel edges, glabrous; style 0.3–0.8(–1.1) mm. Seeds uniseriate, 1.7–3.5 ´ 1.5–2.2 mm; wing continuous, 0.4–1.0 mm wide distally. 2n = 14.

Flowering: Apr–Jul.

Habitat: bluffs, rocky slopes, ravines, and open woods.

Elevation: 0–1150 m.

Distribution: Canada (Quebec), United States (Alabama, Arkansas, Connecticut, District of Columbia, Florida, Georgia, Illinois, Iowa, Kansas, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississipi, Missouri, Nebraska, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Texas, Vermont, Virginia, West Virginia, Wisconsin).

Reproductive mode: Sexual diploid.