Potentilla biflora

D. F. K. Schlechtendal

Ges. Naturf. Freunde Berlin Mag. Neuesten Entdeck. Gesammten Naturk. 7: 297. 1816.

Common names: Two-flower cinquefoil
Illustrated
Treatment appears in FNA Volume 9. Treatment on page 131.

Basal leaves: petiole 1–4 cm, long hairs absent or sparse, 1.5–2 mm, crisped hairs absent or sparse; leaflet lobes linear, 10–20 × 1–2 mm, surfaces with long hairs sparse or absent. Flowers: epicalyx bractlets oblong, ovate, or lanceolate, 2.5–4 × 0.4–1.3 mm; sepals 3.5–5 mm, apex acute to apiculate; petals 6–10 × 4–10 mm; filaments 2.8–4 mm, anthers 0.6 mm; carpels 15–25. Achenes 1.5–2 mm. 2n = 14.


Phenology: Flowering summer.
Habitat: Dryas fellfields, gravel terraces, well-drained soil, often with seasonal seepage, on calcareous substrates
Elevation: 0–2000 m

Distribution

V9 187-distribution-map.jpg

B.C., N.W.T., Nunavut, Yukon, Alaska, Asia

Discussion

In North America, Potentilla biflora is mostly Beringian, barely reaching northern British Columbia and western Northwest Territories, with one locality in Nunavut (southern Victoria Island). The amphi-Beringian range is strongly isolated from other Asian populations, the closest being in the Altai Mountains of south-central Siberia. Two varieties are accepted in China (Li C. L. et al. 2003c), with North American plants falling in var. biflora.

Selected References

None.

Lower Taxa

None.

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

... more about "Potentilla biflora"
1.5mm +  and 2mm +
purple-tinged +  and light green +
0.6 cm6 mm <br />0.006 m <br /> (?) +
Reidar Elven +, David F. Murray +  and Barbara Ertter +
D. F. K. Schlechtendal +
compound +  and simple +
Biflorae +
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 />) +
ceraceous +
reduced +
free +  and distinct +
hairy +  and glabrous +
Two-flower cinquefoil +
B.C. +, N.W.T. +, Nunavut +, Yukon +, Alaska +  and Asia +
not +  and aggregated +
0–2000 m +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
lanceolate +, ovate +  and oblong +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
5-merous +, open +, cymose +  and 2-3(-4)-flowered +
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 />) +
Dryas fellfields, gravel terraces, well-drained soil, often with seasonal seepage, on calcareous substrates +
stoloniferous +  and short-rhizomatous +
straight +
crisped +
0.15 cm1.5 mm <br />0.0015 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 />) +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 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 />) +
racemiform open +  and more or less congested +
crassinucellate +
bipinnate +, odd-pinnate +, subpalmate +, palmate +  and ternate +
opposite +  and alternate +
marcescent +
well-developed +
persistent +
cauline +  and basal +
reduced +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
cuneate-ovate +
palmate +  and pinnate +
revolute toothed +  and divided +
inferior +  and superior +
clustered +, biseriate +  and superposed +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
free +  and distinct +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Flowering summer. +
adnate +, free +, connate +  and distinct +
palmate +  and ternate +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
Ges. Naturf. Freunde Berlin Mag. Neuesten Entdeck. Gesammten Naturk. +
not arillate +
persistent +
free +  and distinct +
erect +  and spreading +
lanceolate +  and broadly ovate or deltate +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Illustrated +
free +  and distinct +
not rooting +
reddish +  and green +
1.5-3 times basal leaves +
1 +  and many +
not flagelliform +
palmate +  and pinnate +
deciduous +
distinct +
subapical +
papillate-swollen +  and filiform-tapered +
rough-thickened +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Potentilla ser. +  and Potentilla subg. Micropogon +
not fleshy-thickened +
Potentilla biflora +
Potentilla sect. Biflorae +
species +
inconspicuous +
enlarged +
biennial +, annual +  and perennial +
herb +  and matted +