Potentilla robbinsiana

(Lehmann) Oakes ex Rydberg

Bull. Torrey Bot. Club 23: 304. 1896.

Common names: White Mountains cinquefoil Robbins’s cinquefoil
Conservation concernEndemic
Basionym: Potentilla minima var. robbinsiana Lehmann Revis. Potentill., 159. 1856
Synonyms: P. hyparctica subsp. robbinsiana (Lehmann) Á. Löve & D. Löve
Treatment appears in FNA Volume 9. Treatment on page 194. Mentioned on page 187, 189.

Plants tufted to densely matted; caudex branches short, ± slender, often embedded in old leaf-bases. Stems spreading to erect, 0.1–0.4 dm, lengths 1–2 times basal leaves. Basal leaves not in ranks, ternate, 1–2 cm; stipules: apex broadly acute; petiole 0.7–3 cm, long hairs sparse to abundant, spreading to subappresed, 0.2–2 mm, weak, glands sparse to common; leaflets 3, central obovate, 0.5–1.3 × 0.2–1 cm, petiolule 0–1 mm, margins flat to ± revolute, not lobed, distal ± 2/3 evenly incised ± 1/2 to midvein, teeth 2–4 (–5) per side, surfaces similar, green, hairs ± abundant (or nearly absent adaxially), 0.5–1 mm, glands sparse to common. Inflorescences 1 (–2) -flowered. Pedicels straight, 0.5–3 cm, not much longer in fruit than in flower. Flowers: epicalyx bractlets oblong to elliptic, (1.8–) 2–2.5 (–3) × 0.7–1.2 (–1.4) mm, ± equal to sepals, margins flat to ± revolute; hypanthium (4–) 5–7 mm diam.; sepals (1.8–) 2–2.5 (–3) mm, apex broadly acute; petals yellow, 2–3 × 2–3 mm; filaments 0.5–1 mm, anthers 0.4–0.6 mm; carpels 20–30, styles columnar-tapered, sometimes ± papillate-swollen in proximal 1/3–1/2, 0.8–1 mm. Achenes 1–1.3 mm. 2n = 49.


Phenology: Flowering summer.
Habitat: Moist rocky slopes and flats, in montane tundra
Elevation: 1400–1600 m

Discussion

Of conservation concern.

Potentilla robbinsiana is known only from two sites in the White Mountains, Monroe County, New Hampshire, and is reported in Vermont. Additional populations have been established nearby as a result of transplant efforts. Listed in 1980 as a federally endangered species, an intense recovery program resulted in the species being delisted in 2002.

Some early specimens were distributed as Potentilla frigida Villars, a similar European species.

Selected References

None.

Lower Taxa

None.

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

... more about "Potentilla robbinsiana"
pale +  and dark green rarely grayish brownish or reddish +
1mm +  and 1.3mm +
green +  and dark green rarely brownish or reddish +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Reidar Elven +, Barbara Ertter +, David F. Murray +  and James L. Reveal +
(Lehmann) Oakes ex Rydberg +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Potentilla minima var. robbinsiana +
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 +
0.5 cm5 mm <br />0.005 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (1 cm10 mm <br />0.01 m <br />) +
White Mountains cinquefoil +  and Robbins’s cinquefoil +
N.H. +  and Vt. +
not +  and aggregated +
1400–1600 m +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
oblong +  and elliptic +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
5-merous +, solitary +  and open +
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 />) +
Moist rocky slopes and flats, in montane tundra +
stoloniferous +  and short-rhizomatous +
straight +
subappresed +
abundant +  and sparse +
crisped +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
not differentiated +
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 />) +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 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 />) +
crassinucellate +
bipinnate +, odd-pinnate +, subpalmate +, palmate +  and ternate +
opposite +  and alternate +
marcescent +
well-developed +
persistent +
cauline +  and basal +
reduced +
not +  and overlapping +
obtriangular +  and flabellate +
linear +  and oblanceolate +
palmate +  and pinnate +
1/2 +  and 2/3 +
flat +  and more or less revolute +
inferior +  and superior +
clustered +, biseriate +  and superposed +
3 cm30 mm <br />0.03 m <br /> (9 cm90 mm <br />0.09 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
free +  and distinct +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
usually longer +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Flowering summer. +
adnate +, free +, connate +  and distinct +
palmate +  and ternate +
12 cm120 mm <br />0.12 m <br /> (20 cm200 mm <br />0.2 m <br />) +
1 cm10 mm <br />0.01 m <br /> (12 cm120 mm <br />0.12 m <br />) +
usually not much longer +
Bull. Torrey Bot. Club +
not arillate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
persistent +
free +  and distinct +
erect +  and spreading +
lanceolate +  and broadly ovate or deltate +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Conservation concern +  and Endemic +
free +  and distinct +
not rooting +
reddish +  and green +
1-2 times basal leaves +
spreading +  and erect +
1 +  and many +
not flagelliform +
palmate +  and pinnate +
deciduous +
distinct +
subapical +
papillate-swollen +  and columnar-tapered +
rough-thickened +
P. hyparctica subsp. robbinsiana +
not fleshy-thickened +
Potentilla robbinsiana +
Potentilla sect. Aureae +
species +
2 +  and 4 +
inconspicuous +
enlarged +
matted +  and cushion-forming +
biennial +, annual +  and perennial +
plant +  and matted +