Perennials, 7-15+ cm; fibrous-rooted (caudices relatively slender). Stems 1, glabrous or sparsely tomentose. Basal leaves (and proximal cauline) petiolate; blades ovate, oblanceolate, or spatulate, 10-30 × 5-20 mm, bases tapering, sometimes obtuse, margins entire, subentire, or dentate. Cauline leaves abruptly reduced (sessile, clasping; bractlike, entire). Heads 1-4+ in corymbiform arrays. Peduncles bracteate (bractlets red-tinged), densely lanate-tomentose. Calyculi conspicuous (bractlets narrow, red-tinged). Phyllaries (13-)21, green (tips red or dark red), densely tomentose proximally. Ray florets (8-)13; corolla laminae 6-10+ mm. Disc florets 35-50+; corolla tubes 2.5-3.5 mm, limbs 3-4 mm. Cypselae 1.5-2 mm, glabrous; pappi 5-6 mm. 2n = 46. Flowering mid Apr-mid Jun. Serpentine derived soils, open woodland scrub; of conservation concern; 500-2500 m; Calif., Oreg. Packera hesperia is known only from the Siskiyou Mountains.