Potentilla sanguinea

Rydberg

in N. L. Britton et al., N. Amer. Fl. 22: 324. 1908.

Common names: Flagstaff cinquefoil
Conservation concernEndemic
Synonyms: Potentilla thurberi var. sanguinea (Rydberg) Kearney & Peebles
Treatment appears in FNA Volume 9. Treatment on page 149. Mentioned on page 150.

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

None.
... more about "Potentilla sanguinea"
Barbara Ertter +  and James L. Reveal +
Rydberg +
Rubrae +
Flagstaff cinquefoil +
2100–2200 m +
Moist forest settings in oak and conifer woodlands +
Flowering summer. +
in N. L. Britton et al., N. Amer. Fl. +
Conservation concern +  and Endemic +
Potentilla thurberi var. sanguinea +
Potentilla sanguinea +
Potentilla sect. Rubrae +
species +