Potentilla paucijuga

Rydberg in N. L. Britton et al.

in N. L. Britton et al., N. Amer. Fl. 22: 348. 1908.

Common names: La Sal cinquefoil
Endemic
Synonyms: Potentilla pensylvanica var. paucijuga (Rydberg) S. L. Welsh & B. C. Johnston P. rubricaulis var. paucijuga (Rydberg) Soják
Treatment appears in FNA Volume 9. Treatment on page 210. Mentioned on page 206, 213.

Caudex branches not sheathed with marcescent whole leaves. Stems decumbent to ascending, 0.5–2 (–2.5) dm. Basal leaves subpalmate, (2–) 3–8 cm; petiole 1–4 cm, long hairs sparse to abundant, ascending to spreading, 0.5–2.5 mm, weak to ± stiff, scarcely to ± verrucose, short-crisped hairs abundant, cottony hairs absent, glands sparse to common; leaflets (3–) 5 (–7), proximalmost separated by 1–5 mm, central narrowly obovate-elliptic, (1–) 1.5–2.5 (–3) × 0.8–1.5 cm, petiolules 0–1 mm, distal 3/4 to whole margin incised 2/3–3/4 to midvein, teeth 5–7 per side, (2–) 3–6 mm, apical tufts 0.5–1 mm, abaxial surfaces grayish white to white, long hairs abundant, cottony-crisped hairs usually dense, short hairs and glands absent or sparse, adaxial grayish green, long hairs common to abundant, 1–2 mm, ± stiff, short-crisped hairs abundant, cottony hairs absent, glands sparse to common. Cauline leaves 1–2. Inflorescences (3–) 5–10-flowered, congested or ± elongating in fruit, branch angle 10–30°. Pedicels 0.2–1 cm, proximal to 1.5 cm. Flowers: epicalyx bractlets ± lanceolate, (2–) 3–5 (–6) × 0.5–1.5 mm; hypanthium 3.5–5 mm diam.; sepals 4–6 mm, apex narrowly acute, glands ± common, only partly obscured; petals yellow, ± overlapping, (4–) 5–6 × 4.5–5.5 mm, longer than sepals; filaments 0.5–2 mm, anthers 0.7 mm; carpels 50–70, styles 1.2–1.5 mm. Achenes 1.3 mm.


Phenology: Flowering summer.
Habitat: Alpine tundra, patches of turf in talus
Elevation: 3300–3700 m

Discussion

Potentilla paucijuga is a distinctive species endemic to the La Sal Mountains in Grand and San Juan counties. Diagnostic features include silvery-silky subpalmate leaves, relatively showy flowers with elongate epicalyx bractlets and sepals, and styles that are nearly 1.5 mm. In Colorado (for example, W. A. Weber and R. C. Wittman 1996), P. pensylvanica var. paucijuga has been applied to what is treated here as P. jepsonii (sect. Pensylvanicae).

Selected References

None.

Lower Taxa

None.

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

... more about "Potentilla paucijuga"
green +  and gray +
not glaucous +  and cottony +
grayish white +  and white +
not glaucous +  and cottony +
smooth +  and faintly rugose +
0.7 cm7 mm <br />0.007 m <br /> (?) +
Reidar Elven +  and Barbara Ertter +
Rydberg in N. L. Britton et al. +
opposite +  and alternate +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 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 +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
obovate-elliptic +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
La Sal cinquefoil +
not +  and aggregated +
3300–3700 m +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 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 />) +
verrucose +
short-crisped +
Alpine tundra, patches of turf in talus +
stoloniferous +  and short-rhizomatous +
straight +
stiff +, weak +  and more or less stiff +
ascending +  and spreading +
abundant +  and common +
verrucose +
short-crisped +  and cottony-crisped +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 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 />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 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 />) +
(3-)5-10-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 +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (1 cm10 mm <br />0.01 m <br />) +
overlapping +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
free +  and distinct +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
2/3 +  and 3/4 +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Flowering 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 /> (1.5 cm15 mm <br />0.015 m <br />) +
in N. L. Britton et al., N. Amer. Fl. +
not arillate +
persistent +
free +  and distinct +
erect +  and spreading +
lanceolate +  and broadly ovate or deltate +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
free +  and distinct +
not rooting +
reddish +  and green +
(1-)1.5-4(-6) times basal leaves +
decumbent +  and ascending +
1 +  and many +
not flagelliform +
palmate +  and pinnate +
linear;ovate +
deciduous +
distinct +
subapical +
papillate-swollen +, less columnar +  and tapered +
rough-thickened +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Potentilla pensylvanica var. paucijuga +  and P. rubricaulis var. paucijuga +
not fleshy-thickened +
Potentilla paucijuga +
Potentilla sect. Rubricaules +
species +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
5 +  and 7 +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
inconspicuous +
enlarged +
biennial +, annual +  and perennial +
herb +  and matted +