Ihsan A. Al-Shehbaz in Flora of North America (vol. 7)
(caudex simple or few-branched, woody, without persistent leaf remains); not scapose; glabrous.
erect, unbranched or branched (few) distally.
basal and cauline; petiolate; basal not rosulate, long-petiolate, (soon withered); cauline petiolate, blade (base hastate, not auriculate), margins entire or proximalmost lobed.
(reflexed at anthesis, several-flowered, lax, proximal flowers sometimes bracteate), considerably elongated in fruit.
straight or curved upward, stout.
sepals ascending, narrowly lanceolate, lateral pair not saccate basally; petals (ascending), white, linear, (only slightly longer than sepals, slightly crisped), claw obovate or oblanceolate, (distinctly wider than blade); stamens subequal (well-exserted beyond petals); filaments slightly dilated basally; anthers linear, (apiculate, coiled after dehiscence); nectar glands confluent, lateral annular or semi-annular, median glands present.
long-stipitate, linear, subtorulose, subterete or slightly compressed; valves each with prominent midvein extending full-length; replum rounded; septum complete; ovules 40-60 per ovary; style obsolete or distinct; stigma capitate, entire.
uniseriate, plump, winged distally, oblong; seed coat not mucilaginous when wetted; cotyledons obliquely accumbent.
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Species within checklist:
Red Butte Canyon, UT