Bull. Torrey Bot. Club 23: 304. 1896.
Plants tufted to densely matted; caudex branches short, ± slender, often embedded in old leaf-bases. Stems spreading to erect, 0.1–0.4 dm, lengths 1–2 times basal leaves. Basal leaves not in ranks, ternate, 1–2 cm; stipules: apex broadly acute; petiole 0.7–3 cm, long hairs sparse to abundant, spreading to subappresed, 0.2–2 mm, weak, glands sparse to common; leaflets 3, central obovate, 0.5–1.3 × 0.2–1 cm, petiolule 0–1 mm, margins flat to ± revolute, not lobed, distal ± 2/3 evenly incised ± 1/2 to midvein, teeth 2–4 (–5) per side, surfaces similar, green, hairs ± abundant (or nearly absent adaxially), 0.5–1 mm, glands sparse to common. Inflorescences 1 (–2) -flowered. Pedicels straight, 0.5–3 cm, not much longer in fruit than in flower. Flowers: epicalyx bractlets oblong to elliptic, (1.8–) 2–2.5 (–3) × 0.7–1.2 (–1.4) mm, ± equal to sepals, margins flat to ± revolute; hypanthium (4–) 5–7 mm diam.; sepals (1.8–) 2–2.5 (–3) mm, apex broadly acute; petals yellow, 2–3 × 2–3 mm; filaments 0.5–1 mm, anthers 0.4–0.6 mm; carpels 20–30, styles columnar-tapered, sometimes ± papillate-swollen in proximal 1/3–1/2, 0.8–1 mm. Achenes 1–1.3 mm. 2n = 49.
Phenology: Flowering summer.
Habitat: Moist rocky slopes and flats, in montane tundra
Elevation: 1400–1600 m
Of conservation concern.
Potentilla robbinsiana is known only from two sites in the White Mountains, Monroe County, New Hampshire, and is reported in Vermont. Additional populations have been established nearby as a result of transplant efforts. Listed in 1980 as a federally endangered species, an intense recovery program resulted in the species being delisted in 2002.
Some early specimens were distributed as Potentilla frigida Villars, a similar European species.
"dm" is not declared as a valid unit of measurement for this property.