Flora of North America species comparison

branched basally and distally, 2–9 dm.

erect [ascending], unbranched or branched proximally, branched distally.

basal and cauline;

petiolate or sessile;

basal not rosulate, petiolate, blade margins dentate, pinnatifid, or lobed;

cauline sessile, subsessile, or shortly petiolate, blade (base not auriculate), margins entire or lobed.

petiole 0.5–2 cm;

blade linear to linear-lanceolate, (2–)3–6(–8) cm × (2–)3–5(–8) mm, base attenuate, margins pinnatifid.

(distal) shortly petiolate or subsessile;

blade linear to narrowly lanceolate, base cuneate, margins pinnately lobed.

(corymbose), considerably elongated in fruit.

sepals 2–3 × 1–1.5 mm, pubescent abaxially;

petals white, (3.5–)4–6.5 × 2–3.5 mm, attenuate to claw, claw 1–1.5 mm, expanded basally;

filaments white, 2–3 mm;

anthers 0.8–1.1 mm.

sepals widely spreading to reflexed, oblong, (equal), lateral pair not saccate basally;

petals (spreading), white or lavender, obovate (longer than sepals), claw well-differentiated from blade, (apex rounded);

stamens (somewhat spreading), tetradynamous;

filaments not dilated basally;

anthers oblong [sagittate];

nectar glands distinct, lateral and median present; (gynophore to 0.5 mm).

divaricate to slightly reflexed, (8–)10–17(–22) mm, (straight).

divaricate, sometimes ascending or slightly reflexed, slender.

each valve orbicular, 5–6.5 × 6–7 mm (nearly as long as wide), base and apex rounded, not margined beyond indurated part surrounding seeds, pubescent;

style 0.5–1 mm.

silicles, subsessile, breaking into two 1-seeded units at maturity, didymous, suborbicular, or broader than long, winged, strongly angustiseptate;

valves keeled, enclosing seeds when falling off, not winged, narrowly winged, or margined, indurated around margin, glabrous or pubescent;

replum concealed by valve margin;

septum complete (ca. 0.1 mm wide);

ovules 2 per ovary;

style relatively short or obsolete, (terete or flattened);

stigma conical, decurrently 2-lobed (appearing entire).

suborbicular, 2.5–3.5 × 2–3 mm.

aseriate, strongly flattened, not winged, broadly oblong to suborbicular;

seed coat (smooth), not mucilaginous when wetted;

cotyledons accumbent to obliquely incumbent.

= 9.

= 18.