Flora of North America species comparison

erect, ascending, or decumbent, unbranched or branched.

basal and cauline;

petiolate or sessile;

basal rosulate or not, petiolate or sessile, blade margins entire;

cauline petiolate or sessile, blade (base cuneate or attenuate), margins entire.

petiolate or sessile;

blade base not auriculate, margins usually entire.

short-stalked or sessile and stellate, or distinctly stalked and subdendritic or forked, sometimes mixed with simple ones.

(few- to several-flowered, sometimes corymbose or paniculate).

ebracteate [bracteate], often elongated in fruit.

sepals ovate or oblong, lateral pair not saccate;

petals yellow or white [rarely pink], suborbicular, spatulate, oblanceolate, linear-oblanceolate, or, obovate (apex obtuse or emarginate);

stamens tetradynamous;

filaments not winged, uni- or bilaterally winged, appendaged, or toothed;

anthers ovate or oblong;

nectar glands (4), 1 on each side of lateral stamen, median glands absent; (placentation apical or parietal).

actinomorphic;

sepals erect to spreading, lateral pair seldom saccate basally;

petals white or yellow [orange, pink, or purple], claw present, usually distinct;

filaments appendaged, winged (toothed), or unappendaged;

pollen 3-colpate.

ascending, divaricate, or reflexed, slender or stout.

sessile, ovate-oblong, obovate, or elliptic [obcordate, rarely globose], usually strongly flattened, latiseptate, rarely inflated;

valves each not veined (smooth), pubescent or glabrous;

replum (visible), rounded;

septum complete, (membranous, translucent, veinless);

ovules 1 or 2 [or 4–8] per ovary;

stigma capitate.

silicles, dehiscent, unsegmented, latiseptate or terete;

ovules 2–16(–20) per ovary;

style distinct;

stigma usually entire, rarely 2-lobed.

biseriate or aseriate, flattened, winged or not, orbicular or suborbicular to ovoid;

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

cotyledons accumbent or incumbent.

biseriate or aseriate, rarely uniseriate;

cotyledons accumbent or incumbent, rarely oblique.