1. Boechera canadensis (L.) Al-Shehbaz (sicklepod)
Arabis canadensis L.
Pl. 312 c, d;
Plants biennial. Stems 30–100 cm long, erect, sometimes few-branched in
the upper half, sparsely pubescent with mostly unbranched hairs toward the
base. Basal leaves often withered by flowering time, 2.5–12.0 cm long,
obovate to lanceolate, entire to sharply toothed, narrowed at the base to a
short petiole, pubescent on both surfaces with unbranched and much fewer,
stalked, forked hairs. Stem leaves usually overlapping, 2–10 cm long,
narrowed at the base, not clasping, the lower leaves sometimes short-petiolate,
entire to toothed, the upper leaves often glabrous, the lower leaves hairy.
Sepals 2–4 mm long, oblong-elliptic, often yellow- or purple-tinged.
Petals 3–5 mm long, white. Fruits (4–)5–11 cm long,
2.5–4.0 mm wide, spreading horizontally to strongly recurved at
maturity, on pedicels arched downward, strongly flattened. Seeds in 1 row in
each locule, 1.3–1.6 mm long, oval to nearly circular in outline,
flattened, strongly winged, the surface with a netlike or honeycomb-like
pattern of ridges and pits, orange. 2n=14. April–June.
Scattered throughout Missouri (eastern U.S. and adjacent Canada
west to Minnesota and Texas). Mesic to dry upland forests,
particularly in openings or on rocky slopes, and along the edges of bluffs, on
both acidic and calcareous substrates.