Ihsan A. Al-Shehbaz in Flora of North America (vol. 7)
not scapose; (often glaucous), glabrous throughout.
erect, usually branched distally, rarely unbranched.
basal and cauline; petiolate or sessile; basal not rosulate, petiolate, blade similar to cauline; cauline petiolate or sessile, blade (base not auriculate), margins entire, dentate, sinuate, or pinnatifid.
(corymbose, several-flowered, lax), considerably elongated in fruit.
usually reflexed, rarely divaricate, slender or stout.
sepals erect, oblong, (unequal), lateral pair subsaccate basally; petals white or yellow (often veins purplish), spatulate, (slightly exceeding sepals, margins crisp), claw well-differentiated from blade, (apex obtuse); stamens in 3 unequal pairs; filaments not dilated basally; anthers ovate to oblong, (apiculate); nectar glands lateral, semi-annular, subtending lateral stamens, median glands absent.
sessile, linear, smooth, latiseptate; valves each with prominent midvein; replum rounded or slightly flattened; septum complete; ovules (12-) 16-28(-34); style distinct, (well-developed, adnate with valves and replum apex); stigma subentire.
uniseriate, flattened, winged, oblong; seed coat not mucilaginous when wetted; cotyledons incumbent.
Species within checklist:
Petrified Forest National Park