Flora of North America species comparison

simple or few from base, (2–)3–8(–11) dm.

erect [ascending], usually branched distally.

basal and cauline; petiolate or sessile;

basal not rosulate, petiolate, blade margins entire or repand [dentate, sinuate];

cauline (middle and distal) sessile.

(withered by flowering): blade oblanceolate, (2.5–)3.5–8(–10) cm, base cuneate or attenuate, apex obtuse.

blade apex acute or obtuse.

(corymbose, several-flowered, dense), considerably elongated in fruit.

sepals 2–2.5 mm;

petals narrowly obcordate, (4–)5–6.5(–8) mm (lobes oblong, (1–)1.5–3 × 0.5–1.5 mm);

filaments white, median pair 2–3.3 mm, lateral pair 0.3–1 mm;

anthers 0.5–1 mm.

sepals erect-ascending [suberect, spreading], oblong, lateral pair not saccate basally;

petals usually white, rarely yellow, obcordate, apex deeply 2-fid;

stamens tetradynamous;

filaments: median pair flattened basally, unappendaged, [laterally 1-toothed], lateral pair with basal toothlike appendage;

anthers oblong, (apex obtuse);

nectar glands (4), lateral, 1 on each side of lateral stamen.

appressed to rachis, (4–)5–9(–12) mm.

erect or divaricate, slender.

(4–)5–8.5(–10) × (2–)2.5–4 mm;

valves obtuse at both ends, trichomes sometimes with unequal rays;

style 1–4 mm, sparsely pubescent basally.

sessile, oblong, or elliptic [ovate, obovate, or orbicular], smooth, slightly inflated [or not inflated], latiseptate;

valves each not veined or with obscure midvein, stellate-hairy [glabrous];

replum rounded;

septum complete, (membranous);

ovules 4–16 per ovary;

stigma capitate, obscurely 2-lobed.

slightly flattened, narrowly margined, 1–2.3 mm diam. 2n = 16.

biseriate, flattened [plump], margined [winged or not], lenticular or ovoid-lenticular [suborbicular];

seed coat (minutely reticulate), not mucilaginous when wetted;

cotyledons accumbent.

= 8.