Potentilla sanguinea
in N. L. Britton et al., N. Amer. Fl. 22: 324. 1908.
Stems 3–7 (–10) dm. Basal leaves ± subpalmate, sometimes palmate, (4–) 6–15 (–21) cm; petiole (2–) 4–10 (–15) cm, long hairs sparse to abundant, spreading to weakly appressed, 0.5–2 (–3) mm, weak to ± stiff, glands sparse to abundant; leaflets (5–) 7, on less than distal 1/10 (1–5 [–10] mm) of leaf axis, central one 1–6 (–7) × 1–2 (–3) cm, petiolules 0 (–6) mm, distal 1/2–3/4 (sometimes nearly whole), margin incised 1/5 or less to midvein, teeth 4–10 (–15) per side, 1–2 (–3) mm, teeth apex ± obtuse, surfaces ± similar, abaxial green, straight hairs sparse to abundant, especially on veins, 0.5–1.5 mm, cottony hairs absent, glands ± sparse or absent, adaxial slightly paler green, hairs shorter and sparser. Cauline leaves: stipules usually entire. Inflorescences (4–) 8–40 (–70) -flowered. Pedicels 0.3–2 cm. Flowers: epicalyx bractlets lanceolate-elliptic, 3.5–8 × 1–1.5 (–2) mm; sepals 4–8 (–10) mm, apex acuminate; petals dark reddish proximally, reddish orange distally, (3.5–) 5–9 × 5–10 mm; filaments 1.5–2.5 mm, anthers 0.8 mm; carpels 30–40, styles 2–3 mm. Achenes 1.5–2 mm, lightly rugose.
Phenology: Flowering summer.
Habitat: Moist forest settings in oak and conifer woodlands
Elevation: 2100–2200 m
Discussion
Of conservation concern.
Potentilla sanguinea is known only from south and east of Flagstaff, Coconino County. The species may be a hybrid between P. thurberi var. thurberi and P. hippiana or another member of sect. Leucophyllae that occurs sympatrically.
Selected References
None.
Lower Taxa
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