Hesperidanthus suffrutescens

Perennials; (suffrutescent, woody proximally). Stems several from caudex, erect to ascending, (few-branched distally), 1-3.5 dm. Cauline leaves sessile or petiolate, (to 11 mm); blade oblanceolate to lanceolate or elliptic, (0.7-)1-2.5 cm × 3-10 mm, base cuneate to attenuate, margins entire or, rarely, obscurely denticulate, apex acute or obtuse. Racemes 5+-flowered, (sometimes 1 or 2 flowers bracteate). Fruiting pedicels ascending, straight or curved upward, 3-10(-12) mm. Flowers: sepals yellowish green, 4-6 × 1-1.5 mm; petals yellow, 7-11 × 1.5-2.5 mm, claw undifferentiated from blade; filaments 2-3 mm; anthers oblong, 0.7-0.9 mm; gynophore 0.4-0.8 mm. Fruits straight, latiseptate, 1-2 cm × 1.2-2.5 mm; ovules 8-16 per ovary; style cylindrical, (0.5-)1-2 mm; stigma flat, entire. Seeds 1.5-1.9 × 0.9-1.3 mm.

Flowering May-Jul. Mixed desert shrubs, shale barrens, decomposed chip-rock, limy shale; of conservation concern; 1500-2100 m; Utah.

Hesperidanthus suffrutescens is restricted to the Green River Formation in Duchesne and Uintah counties.