Flora of North America species comparison

(rarely absent, base of plant forming inflated crown), erect, ascending, subdecumbent, or decumbent, unbranched or branched distally.

(not inflated into crown), ascending or subdecumbent, (0.5–)1–3(–4) dm.

basal and cauline;

petiolate or subsessile;

basal rosulate or not, petiolate, blade margins 1- or 2- (or 3-)pinnatisect, (terminal lobe margin entire or dentate);

cauline sessile [subsessile], blade (base not auriculate), margins similar to basal.

rosulate;

petiole 1–2.5 cm;

blade margins 2-pinnatisect, 4–8 cm;lobes 4–11 on each side, (smaller than terminal);

apical segment linear to oblong or ovate, 1–6 × 0.5–2.5 mm, margins entire.

(and bracts) similar to basal, smaller distally.

(sometimes pedicels originating between basal leaves, bracteate throughout, rachis straight), considerably elongated in fruit.

sepals (sometimes persistent), erect, spreading, or ascending, (yellowish), oblong, oblong-linear or -lanceolate, lateral pair slightly saccate basally;

petals yellow, spatulate to broadly obovate, claw differentiated from blade, (apex rounded or emarginate [obtuse]);

stamens tetradynamous;

filaments not dilated basally;

anthers linear, ovate, or oblong [sagittate];

nectar glands confluent (extending into spreading teeth).

sepals spreading, oblong, 4–6(–7) × 1.5–2.5 mm, apex appendage developed, 0.5–0.8 mm;

petals spatulate, 4–7 × 2.5–4 mm, apex rounded or emarginate;

median filament pairs 3–4 mm, not dilated basally;

anthers ovate, 1–1.5 mm;

gynophore 1–3 mm.

divaricate to ascending, slender.

some from basal leaf axils, (10–)20–40(–50) mm.

silicles, sessile or shortly stipitate, usually oblong, elliptical, suborbicular, or globose, rarely obovoid, smooth, latiseptate, terete, or slightly inflated;

valves (vesicular in S. grandis, thin-papery to leathery), each without midvein, obscurely to prominently reticulate-veined;

replum rounded or flattened;

septum complete or perforated;

ovules 8–44 per ovary;

style distinct, (1–12 mm, sometimes flattened basally);

stigma capitate.

globose or, rarely, obovoid, terete, 0.8–1.5 cm × 8–14 mm, (not fleshy, papery), base usually obtuse, rarely cuneate, apex obtuse;

valves obscurely reticulate-veined;

replum not flattened;

septum complete;

ovules 8–14 per ovary;

style 1–2(–3) mm, not flattened basally.

biseriate, flattened, winged throughout, orbicular;

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

cotyledons accumbent.

4–5 mm diam.;

wing 1–1.5 mm.

= 7, 12, 13.

= 24.