Potentilla jepsonii

Ertter

J. Bot. Res. Inst. Texas 2: 202. 2008.

Common names: Jepson’s potentilla
Endemic
Basionym: Potentilla pensylvanica var. ovium Jepson Fl. Calif. 2: 184. 1936 (as pennsylvanica)
Synonyms: P. litoralis var. ovium (Jepson) Soják
Treatment appears in FNA Volume 9. Treatment on page 216. Mentioned on page 209, 210, 214, 217.

Stems decumbent to nearly erect, (0.2–) 0.5–2.6 dm. Basal leaves subpinnate to subpalmate, 1.5–10 (–17) cm; petiole 0.5–4 (–8) cm, long hairs ± abundant, spreading to loosely appressed, 0.5–2 mm, weak to stiff, short hairs absent or sparse, cottony or crisped hairs absent, glands sparse to abundant; leaflets (1–) 2–3 per side, on distal 1/6–1/3 (–1/2) of leaf axis, separate to slightly overlapping, terminal ones oblanceolate-elliptic to narrowly obovate, (0.5–) 1–2.5 (–3.5) × 0.4–1 (–1.3) cm, margins strongly revolute, incised 3/4+ to midvein, undivided medial blade 1.5–3 (–5) mm wide, teeth (2–) 3–5 (–6) per side, ± linear-elliptic to rarely ovate or oblanceolate, surfaces ± dissimilar, abaxial ± grayish, rarely white, long hairs ± abundant especially on veins, 1 mm, weak, short hairs absent or sparse, cottony hairs absent, crisped hairs sparse to abundant, glands ± abundant, sometimes obscured, adaxial green to gray-green, long hairs sparse to abundant, loosely appressed, 0.5–1 (–2) mm, short hairs absent or sparse, cottony and crisped hairs absent, glands ± abundant. Cauline leaves 1–2. Inflorescences (1–) 3–12 (–20) -flowered, congested, scarcely opening in fruit. Pedicels 0.2–0.5 cm (proximal to 1.2 cm). Flowers: epicalyx bractlets elliptic to linear, 1.5–3 × (0.3–) 0.5–1.2 mm, lengths 1/2–3/4 times sepals, margins flat; hypanthium 2.5–5 mm diam.; sepals 2–5 mm, apex usually ± acute to obtuse, rarely acuminate, abaxial surfaces: venation faint, glands abundant, evident; petals pale-yellow, 2–5 × 2–4 mm, lengths ± equal to sepals; filaments 0.5–2 mm, anthers 0.3–0.7 mm; carpels 20–60, styles papillate-swollen in proximal 1/2–3/4+, 0.8–1.2 mm. Achenes 1 mm, smooth to faintly rugose.


Phenology: Flowering summer.
Habitat: Seasonally moist sites in alpine meadows, ridges, fellfields, rock ledges, talus slopes
Elevation: 2500–3700 m

Distribution

V9 324-distribution-map.jpg

Alta., Ariz., Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash.

Discussion

Potentilla jepsonii (a replacement name for P. pensylvanica var. ovium) is widespread at higher elevations in the Intermountain Region, extending into the Sierra Nevada in California and the Rocky Mountains in Idaho and Wyoming. Disjunct occurrences are known on the north rim of the Grand Canyon and San Francisco Peaks, Arizona, and Steens Mountain, Oregon. Collections have most commonly been included in P. pensylvanica (for example, B. Ertter 1993; N. H. Holmgren 1997b); they differ in leaf division, vestiture, and epicalyx bractlets. J. Soják considered var. ovium to be a variety of P. litoralis, which has comparable leaves and vestiture; P. jepsonii lacks the enlarged, revolute epicalyx bractlets that distinguish P. litoralis and is for the most part well separated geographically and elevationally. The exception is the montane phase of P. litoralis, which, at the current stage of knowledge, is somewhat arbitrarily delimited from P. jepsonii in the northern Rocky Mountains; collections from Waterton Lakes National Park in Alberta and the Okanogan Mountains in Washington are tentatively placed here in P. jepsonii.

Selected References

None.

Lower Taxa

None.

No values specified."dm" is not declared as a valid unit of measurement for this property.

... more about "Potentilla jepsonii"
white +  and grayish +
smooth +  and faintly rugose +
green +  and gray-green +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
Barbara Ertter +  and Reidar Elven +
Ertter +
subpinnate +  and subpalmate +
opposite +  and alternate +
10 cm100 mm <br />0.1 m <br /> (17 cm170 mm <br />0.17 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Potentilla pensylvanica var. ovium +
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 />) +
reduced +
free +  and distinct +
hairy +  and glabrous +
Jepson’s potentilla +
Alta. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, Oreg. +, Utah +  and Wash. +
not +  and aggregated +
2500–3700 m +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 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 />) +
evident +  and obscured +
crisped +
Seasonally moist sites in alpine meadows, ridges, fellfields, rock ledges, talus slopes +
stoloniferous +  and short-rhizomatous +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
straight +
weak +  and stiff +
spreading +  and loosely appressed +
sparse +  and abundant +
crisped +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 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 />) +
0.25 cm2.5 mm <br />0.0025 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 />) +
(1-)3-12(-20)-flowered +
crassinucellate +
bipinnate +, odd-pinnate +, subpalmate +, palmate +  and ternate +
opposite +  and alternate +
marcescent +
well-developed +
persistent +
cauline +  and basal +
reduced +
separate +  and slightly overlapping +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
oblanceolate-elliptic +  and narrowly obovate +
0.4 cm4 mm <br />0.004 m <br /> (?) +  and 1 cm10 mm <br />0.01 m <br /> (?) +
linear +  and oblanceolate +
palmate +  and pinnate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
inferior +  and superior +
clustered +, biseriate +  and superposed +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.05 cm10.5 mm <br />0.0105 m <br />) +
free +  and distinct +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
4 cm40 mm <br />0.04 m <br /> (8 cm80 mm <br />0.08 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Flowering summer. +
adnate +, free +, connate +  and distinct +
pinnate +  and subpinnate or subpalmate +
25 cm250 mm <br />0.25 m <br /> (30 cm300 mm <br />0.3 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (25 cm250 mm <br />0.25 m <br />) +
often significantly longer +
J. Bot. Res. Inst. Texas +
not arillate +
persistent +
free +  and distinct +
erect +  and spreading +
lanceolate +  and broadly ovate or deltate +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
free +  and distinct +
not rooting +
reddish +  and green +
(1-)1.5-3(-4) times basal leaves +
decumbent +  and nearly erect +
1 +  and many +
not flagelliform +
palmate +  and pinnate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
deciduous +
distinct +
subapical +
papillate-swollen +
rough-thickened +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
P. litoralis var. ovium +
not fleshy-thickened +
Potentilla jepsonii +
Potentilla sect. Pensylvanicae +
species +
3 +  and 5 +
less linear-elliptic +  and rarely ovate or oblanceolate +
inconspicuous +
enlarged +
biennial +, annual +  and perennial +
herb +  and matted +