Hymenolobus Nutt.
Annual or biennial taprooted herbs. Hairs simple. Stems erect or procumbent, leafy. Lvs simple, entire to pinnatifid. Racemes ebracteate. Sepals erecto-patent, not saccate. Petals white. Stamens 6, without appendages. Lateral nectaries 4, beside bases of single stamens; median nectaries 0. Stigma sessile, capitate. Silicle oblong to obovate, angustiseptate, dehiscent; valves reticulately veined, bluntly keeled but not winged. Seeds ovoid, not winged, in 2 rows per locule.
5 spp., N. temperate. Naturalised sp. 1.
