Contr. U.S. Natl. Herb. 12: 375. 1909.
Herbs, stout perennial. Stems 0.5–2 m. Leaves: 4–6 pairs proximal to inflorescence; petiole 1–7 cm; blade broadly ovate to almost reniform, 2–10 × 2–9.5 cm, base broadly rounded to truncate or cordate, apex rounded to broadly obtuse, adaxial surface yellow-green, abaxial surface much paler, both surfaces moderately villous-hirsute, hairs with dark-brown to blackish pustulate bases. Flowers 5–15 in umbellike clusters on branches of inflorescence; perianth 9–10 mm, tube very pale-pink to rose-pink, densely shaggy-hairy, limbs very pale-pink to rose-pink, gradually flared; stamens 3, exserted 1–2 mm. Fruits broadly fusiform, 3.5–6 × 2.1–2.7 mm, not secreting mucilage when wetted; ribs 10, well defined, linear, low, narrow; equatorial-ridge absent or occasionally low, linear, and incomplete. 2n = 24.
Phenology: Flowering late winter–late summer, occasionally mid fall.
Habitat: Dry, gravelly outwash fans, talus slopes, roadsides
Elevation: 70-1200 m
"thick" is not a number.