Bull. Torrey Bot. Club 100: 87, fig. 2. 1973.
Herbs, perennial, 0.8–1.5 (–2) dm; from a woody caudex; with a taproot. Stems solitary, sometimes few, erect or ascending, sometimes decumbent, unbranched, glabrous proximally, hairy distally, hairs retrorse or spreading, rarely appressed, short to medium length, soft, eglandular. Leaves green, green tinged with purple, or dull purple, linear to narrowly lanceolate, 1.7–3.5 (–4.5) cm, not fleshy, margins plane, slightly involute, 0 (–3) -lobed, apex acute; lobes ascending, linear, mostly short, apex acute. Inflorescences 3.5–6.5 × 2–5 cm; bracts magenta, rose red, lavender, or pink throughout, broadly lanceolate, oblong, or ovate, (0–) 3 (–5) -lobed; lobes ascending to erect, linear to lanceolate, short, arising above, sometimes slightly below, mid length, center lobe apex rounded, lateral ones acute. Calyces colored as bracts, 16.5–22 (–27) mm; abaxial and adaxial clefts (8–) 10–15 (–18) mm, 33–40% of calyx length, deeper than laterals, lateral (1.5–) 3–6 (–8) mm, 20–30% of calyx length; lobes narrowly lanceolate to elliptic, apex acute, sometimes obtuse. Corollas straight or slightly curved, 19–25 (–27.5) mm; tube 9–16 mm; beak exserted, adaxially green, 7–10 (–11.5) mm; abaxial lip deep green or deep purple, slightly inflated, rounded, 1.5–2.5 mm, 20–30% as long as beak; teeth usually ± incurved, magenta or deep green, 0.6–1.4 (–2) mm. 2n = 24.
Phenology: Flowering May–Jul.
Habitat: Dry, gravelly openings and barrens in pine forests, limestone.
Elevation: 2400–3100 m.
Castilleja revealii is a narrow endemic of limestone gravel barrens on the Markagunt and Paunsaugunt plateaus in and adjacent to the rim of Bryce Canyon National Park and Cedar Breaks National Monument in south-central Utah. It is also known from a single collection from the southwestern edge of the Aquarius Plateau. These xeric barrens have an extremely high amount of reflective sunlight and support few other plants.