Potentilla fragiformis

D. F. K. Schlechtendal

Ges. Naturf. Freunde Berlin Mag. Neuesten Entdeck. Gesammten Naturk. 7: 294. 1816.

Treatment appears in FNA Volume 9. Treatment on page 191. Mentioned on page 189, 192.

Plants tufted to cushion-forming; caudex branches short, stout, diam. 1–1.5 (–2) cm, including old leaf-bases. Stems ascending to erect, 0.3–1.5 (–2) dm, lengths 1–2 times basal leaves. Basal leaves not in ranks, ternate, (1–) 4–10 (–15) cm; stipules: apex acute to obtuse; petiole (0.3–) 2–11 (–13) cm, long hairs abundant, ascending to spreading, 1–2.3 mm, soft, glands sparse to common; leaflets 3, central obovate, 0.7–2.5 × 0.5–1.6 cm, petiolule 0–1 mm, margins revolute, not lobed, distal 1/2–2/3 evenly incised ± 1/3 to midvein, teeth 2–3 (–4) per side, surfaces ± similar, green (paler abaxially), hairs common, 1–1.5 mm, glands common (sparser adaxially). Inflorescences 1–3-flowered. Pedicels straight, 0.5–2 cm in flower, to 3.5 cm in fruit. Flowers: epicalyx bractlets oblong, 3–7 × 1.2–2.5 mm, margins revolute; hypanthium 4–6 mm diam.; sepals 4–6 (–7) mm, apex broadly acute to obtuse; petals yellow, 9–12 × 8–10 mm; filaments (2–) 2.8–3.2 mm, anthers 0.5–0.8 mm; carpels 40–50, styles filiform, not or scarcely papillate-swollen proximally, 1.7–2 mm. Achenes 1.3–1.5. 2n = 42, 56 (Russian Far East).


Phenology: Flowering late spring–summer.
Habitat: Leymus-Potentilla sand dunes, coastal gravel bars, beach ridges
Elevation: 0–10 m

Distribution

V9 289-distribution-map.jpg

Alaska, e Asia (Russian Far East)

Discussion

Recent collections of Potentilla fragiformis in Alaska on the coast of the Bering and Chukchi seas have confirmed historical reports (P. A. Rydberg 1908d) of this Beringian species in North America. Dwarf plants from St. Lawrence Island are somewhat intermediate to P. nana but have the larger petals and longer styles of P. fragiformis.

Selected References

None.

Lower Taxa

None.

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

... more about "Potentilla fragiformis"
pale +  and dark green rarely grayish brownish or reddish +
green +  and dark green rarely brownish or reddish +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
Reidar Elven +, Barbara Ertter +, David F. Murray +  and James L. Reveal +
D. F. K. Schlechtendal +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
4 cm40 mm <br />0.04 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Aureae +
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 +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
Alaska +  and e Asia (Russian Far East) +
not +  and aggregated +
0–10 m +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.32 cm3.2 mm <br />0.0032 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 />) +
Leymus-Potentilla sand dunes, coastal gravel bars, beach ridges +
stoloniferous +  and short-rhizomatous +
straight +
stiff +, weak +  and more or less stiff +
ascending +  and spreading +
common +  and abundant +
crisped +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 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 />) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 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 +
1/3 +, 1/2 +  and 2/3 +
incised +  and not lobed +
inferior +  and superior +
clustered +, biseriate +  and superposed +
3 cm30 mm <br />0.03 m <br /> (9 cm90 mm <br />0.09 m <br />) +
0 cm0 mm <br />0 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
free +  and distinct +
0.9 cm9 mm <br />0.009 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
usually longer +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
11 cm110 mm <br />0.11 m <br /> (13 cm130 mm <br />0.13 m <br />) +
2 cm20 mm <br />0.02 m <br /> (11 cm110 mm <br />0.11 m <br />) +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Flowering late spring–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 +
Ges. Naturf. Freunde Berlin Mag. Neuesten Entdeck. Gesammten Naturk. +
not arillate +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
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 +
1-2 times basal leaves +
ascending +  and erect +
1 +  and many +
not flagelliform +
palmate +  and pinnate +
deciduous +
distinct +
subapical +
papillate-swollen +  and filiform +
rough-thickened +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Potentilla ser. +  and Potentilla sect. Frigidae +
not fleshy-thickened +
Potentilla fragiformis +
Potentilla sect. Aureae +
species +
2 +  and 3 +
inconspicuous +
enlarged +
matted +  and cushion-forming +
biennial +, annual +  and perennial +
plant +  and cushion-forming +