Flora of North America species comparison

(simple or few to many from base), usually erect to ascending, rarely subdecumbent, (slender), (0.5–)0.8–2.7(–3.5) dm.

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

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.

not rosulate;

petiole 0.5–1 cm;

blade margins 1-pinnatisect, (1–)2.5–7(–10) cm;

lobes (3–)6–12(–18) on each side, (smaller than terminal), linear to oblong or ovate, (1–)2–10 × 0.5–1(–2.5) mm, margins entire or coarsely dentate.

(and bracts) similar to basal, smaller distally.

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

sepals spreading to ascending, oblong-linear, (3.5–)5–7 × 1–1.5 mm, apex appendage not developed;

petals spatulate, (8–)10–13 × 3–4.5 mm, apex rounded;

median filament pairs 5–7(–8) mm, not dilated basally;

anthers oblong, 1–1.5 mm;

gynophore (0.5–)1–2(–5) mm, or, rarely, obsolete.

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).

from racemes, (6–)10–22(–30) mm, (slender).

divaricate to ascending, slender.

usually oblong to elliptical, rarely suborbicular, usually latiseptate, rarely inflated, (0.5–)1–2.5(–3) cm × (3.5–)5–8(–11) mm, (not fleshy, thin-papery), base and apex acute;

valves faintly reticulate-veined;

replum flattened;

septum complete or perforated;

ovules (8–)10–20 per ovary;

style 3–9(–12) mm, slender or flattened basally.

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.

3–4 mm diam.;

wing 0.5–1 mm.

biseriate, flattened, winged throughout, orbicular;

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

cotyledons accumbent.

= 7, 12, 13.

= 46, 138.