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Herbs annual, glabrous. Roots fibrous. Flowering stems simple or branched from base, erect, stout, 1-2.5 cm. Leaves crowded; leaf blade broadly oblanceolate to subobovate, 4-9 mm, basal spur broad and obtuse, apex subacute. Cyme corymbiform, 1-2.7 cm in diam., densely 5-20-flowered; bracts broadly oblanceolate to subobovate. Flowers unequally 5-merous; pedicel 3-5 mm. Sepals ovate to ovate-oblong, unequal, 2.8-4 mm, base obtuse and shortly spurred, apex subacute. Petals free, yellow, narrowly oblong, 2.5-3.5 mm, base broadly clawed, apex subacute. Stamens 10; antesepalous ones ca. 2.8 mm; antepetalous ones inserted ca. 0.8 mm from petal base. Nectar scales linear, 1-1.7 mm, apex obtuse. Carpels divergent, ca. 3 mm, base connate for 0.5-0.7 mm; ovules many. Seeds ovoid-oblong, 0.8-1 mm, mammillate. Fl. Jul, fr. Aug.
- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA