Potentilla hookeriana

Lehmann

Index Seminum (Hamburg) 1849: 10. 1849.

Common names: Hooker’s cinquefoil
Endemic
Synonyms: Potentilla nivea subsp. hookeriana (Lehmann) Hiitonen P. nivea var. hookeriana (Lehmann) Th. Wolf
Treatment appears in FNA Volume 9. Treatment on page 208. Mentioned on page 196, 200, 207.

Caudex branches not sheathed with marcescent whole leaves. Stems ascending to nearly erect, (0.3–) 0.5–2 dm. Basal leaves usually both ternate and palmate on same plant, rarely subpalmate, 1–9 cm; petiole 0.5–6 cm, long hairs common to abundant, ± appressed to ascending-spreading, (0.5–) 1–1.5 (–2) mm, usually stiff, rarely weak, verrucose, short-crisped hairs sparse to common, cottony hairs absent, glands ± sparse; leaflets 3–5, proximalmost separated by 0 (–1) mm, central oblanceolate to obovate, 0.5–2.5 × 0.4–1.2 cm, petiolules 0–1 mm, distal ± 3/4 of margin incised 1/2–3/4, rarely +, to midvein, teeth 2–6 per side, 1–5 mm, apical tufts 0.5–1 mm, abaxial surfaces grayish white to white, long hairs common to abundant, cottony-crisped hairs usually dense, short hairs and glands absent or obscured, adaxial green to grayish green, long hairs sparse to common, 0.5–1.5 mm, usually stiff, short and/or crisped hairs sparse to common, cottony hairs absent, glands sparse to common. Cauline leaves 1–2. Inflorescences 1–6 (–8) -flowered, open, branch angle 20–50°. Pedicels (0.5–) 1–2 cm, proximal to 3 cm. Flowers: epicalyx bractlets linear to oblong-lanceolate, 2–3 × 0.7–1.3 mm; hypanthium 3–4 mm diam.; sepals 3–5 mm, apex subacute, glands ± common, not obscured; petals yellow, ± overlapping, 3–6 (–7) × 4–5 mm, usually longer than sepals; filaments 0.5–1.5 mm, anthers 0.3–0.5 mm; carpels 30–50, styles 0.8–1.2 mm. Achenes 1–1.3 mm.


Phenology: Flowering (spring–)summer.
Habitat: Alpine ridges, fellfields, scree slopes, rocky canyons
Elevation: 1400–3900 m

Distribution

V9 313-distribution-map.jpg

Alta., B.C., Colo., Idaho, Mont., Nev., Utah, Wyo.

Discussion

As here defined, Potentilla hookeriana consists of primarily alpine plants from the Rocky Mountains and adjacent desert mountains that share many of the same characters with P. rubricaulis but are smaller overall. Arctic plants previously included in P. hookeriana are now assigned to P. arenosa (J. Soják 1986; B. Ertter et al. 2013).

Selected References

None.

Lower Taxa

None.

"dm" is not declared as a valid unit of measurement for this property.

... more about "Potentilla hookeriana"
green +  and gray +
not glaucous +  and cottony +
grayish white +  and white +
not glaucous +  and cottony +
smooth +  and faintly rugose +
1mm +  and 1.3mm +
green +  and grayish green +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Reidar Elven +  and Barbara Ertter +
Lehmann +
subpalmate +, palmate +  and ternate +
opposite +  and alternate +
1 cm10 mm <br />0.01 m <br /> (9 cm90 mm <br />0.09 m <br />) +
Rubricaules +
25 cm250 mm <br />0.25 m <br /> (30 cm300 mm <br />0.3 m <br />) +
less cordate or reniform +  and narrowly elliptic +
0.5 cm5 mm <br />0.005 m <br /> (25 cm250 mm <br />0.25 m <br />) +
coriaceous +
reduced +
free +  and distinct +
hairy +  and glabrous +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
oblanceolate +  and obovate +
0 cm0 mm <br />0 m <br /> (?) +
Hooker’s cinquefoil +
Alta. +, B.C. +, Colo. +, Idaho +, Mont. +, Nev. +, Utah +  and Wyo. +
not +  and aggregated +
1400–3900 m +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
linear +  and oblong-lanceolate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (2 cm20 mm <br />0.02 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
deciduous +
on style scar +, hairy +  and glabrous +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
not obscured +  and obscured +
crisped +
Alpine ridges, fellfields, scree slopes, rocky canyons +
stoloniferous +  and short-rhizomatous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
straight +
stiff +  and weak +
less appressed +  and ascending-spreading +
sparse +  and common +
verrucose +
crisped +, cottony-crisped +  and short-crisped +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
open +  and 1-6(-8)-flowered +
crassinucellate +
bipinnate +, odd-pinnate +, subpalmate +, palmate +  and ternate +
opposite +  and alternate +
marcescent +
well-developed +
persistent +
cauline +  and basal +
reduced +
oblanceolate +  and obovate oblong or elliptic +
linear +  and oblanceolate +
palmate +  and pinnate +
1/2 +  and 3/4 +
inferior +  and superior +
clustered +, biseriate +  and superposed +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
overlapping +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
free +  and distinct +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
usually longer +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Flowering (spring–)summer. +
adnate +, free +, connate +  and distinct +
ternate +, usually palmate +  and subpalmate +
1 cm10 mm <br />0.01 m <br /> (10 cm100 mm <br />0.1 m <br />) +
0 cm0 mm <br />0 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Index Seminum (Hamburg) +
not arillate +
persistent +
free +  and distinct +
erect +  and spreading +
lanceolate +  and broadly ovate or deltate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
free +  and distinct +
not rooting +
reddish +  and green +
(1-)1.5-4(-6) times basal leaves +
ascending +  and nearly erect +
1 +  and many +
not flagelliform +
palmate +  and pinnate +
linear;ovate +
deciduous +
distinct +
subapical +
papillate-swollen +, less columnar +  and tapered +
rough-thickened +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
Potentilla nivea subsp. hookeriana +  and P. nivea var. hookeriana +
not fleshy-thickened +
Potentilla hookeriana +
Potentilla sect. Rubricaules +
species +
2 +  and 6 +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
inconspicuous +
enlarged +
biennial +, annual +  and perennial +
herb +  and matted +