Proc. Amer. Acad. Arts 14: 292. 1879,.
Plants stoloniferous. Flowering stems erect, 5–45 cm. Leaves: blade 1–12 cm wide, 1–2 times toothed, 7–11-lobed for 1/3–1/2 length, lobes cuneate to cuneate-oblong; margins entire or erose with long bristles. Inflorescences erect, primary and higher-order branches perpendicular to central axis. Flowers: hypanthium widely turbinate-campanulate, portion distal to adnation to ovary marked by conspicuous flaring, 1.5–2.5 × 2–4.5 mm, stipitate-glandular proximally; sepals triangular, 0.9–1.5 × 0.8–1.2 mm, broader than long at apex, apex acute; petals unlobed, 1.6–2.5 mm, suborbiculate, abruptly clawed, 1–1.8 mm wide; ovary 4/5+ inferior. Capsules cylindric, 3.8–7.1 × 1.2–2.6 mm, beaks ± spreading. Seeds dark red-brown, 1.1–1.7 × 0.3–0.5 mm, main body (excluding winged margins) 0.8–1 mm. 2n = 14.
Phenology: Flowering May–Jul.
Habitat: Moist, basaltic cliffs, typically near waterfalls
Elevation: 0-400(-1400) m