PLANODES Greene, Leafl. Bot. Observ. Crit. 2: 220. 1912.
Ihsan A. Al-Shehbaz
Tribe: Cardamineae Dumort., Fl. Belg.: 124. 1827.
Name derivation: Greek planodos, erring, in reference to the error of original author of its species, Linnaeus, in assigning it to another genus.
Type species: Planodes virginicum (Linnaeus) Greene (based on Cardamine virginica Linnaeus).
Herbs, annual or winter annual. Trichomes absent or simple. Multicellular glands absent. Stems decumbent or sometimes erect, often branched above. Basal leaves long petiolate, loosely rosulate, simple, pinnatifid to pinnatisect, lobes dentate or entire; cauline leaves, short petioled, not auriculate at base, similar to basal but with fewer and narrower lateral lobes. Racemes several-flowered, ebracteate, corymbose, elongated considerably in fruit; rachis straight; fruiting pedicels slender, divaricate-ascending, persistent. Sepals oblong, free, caducous, erect, glabrous or subapically with a few hairs, equal, base of lateral pair not saccate. Petals white, erect, longer than sepals; blade oblanceolate, apex obtuse; claw hardly or not differentiated from blade, glabrous, unappendaged, entire. Stamens 6, slightly exsertd, somewhat tetradynamous; filaments wingless, unappendaged, glabrous, free; anthers ovate, obtuse at apex. Nectar glands lateral, minute, 1 on each side of lateral stamen, median glands absent. Ovules (20–)28–44 per ovary, placentation parietal. Fruit dehiscent siliques, linear, latiseptate, not inflated, unsegmented; valves papery, with an obscure midvein, glabrous, not keeled, torulose, wingless, unappendaged; gynophore obsolete; replum rounded, visible; septum complete, membranous, veinless; style conical, less than 1 mm, persistent; stigma capitate, entire, unappendaged. Seeds uniseriate, narrowly winged, orbicular or nearly so, flattened; seed coat not mucilaginous when wetted; cotyledons accumbent. x = 8.
Monospecific: NW Mexico and C and S United States.
Reference: Rollins (1947)