[For the state Idaho]

Ihsan A. Al-Shehbaz

Platyspermum Hooker, Fl. Bor.-Amer. 1: 68, plate 18, fig. B. 1830, not Hoffmann 1814

Plants scapose. Stems absent. Leaves basal, rosulate, petiolate, blade margins entire or lyrately lobed. Inflorescences (few to many) on peduncle from basal rosette. Fruiting pedicels ascending or erect, slender. Flowers: sepals ovate or oblong; petals oblanceolate, (slightly longer than sepals, apex obtuse); stamens (erect), slightly tetradynamous; filaments not dilated basally; anthers ovate or broadly so, (apex obtuse); nectar glands lateral, semiannular, intrastaminal, median glands present (smaller, distinct). Fruits sessile or, rarely, stipitate, orbicular or orbicular-ovate, smooth, strongly latiseptate; valves not veined or obscurely veined; replum slightly flattened; septum complete, (hyaline); stigma capitate. Seeds flattened, broadly winged, orbicular; seed coat (coarsely reticulate at center), not mucilaginous when wetted; cotyledons accumbent. x = 8.

Species 1: w North America.

Lower Taxon

• Idahoa scapigera (Hooker) A. Nelson & J. F. Macbride