Potentilla rubricaulis

Lehmann

Nov. Stirp. Pug. 2: 11. 1830.

Common names: Red-stemmed cinquefoil
Endemic
Synonyms: Potentilla dissecta var. rubricaulis (Lehmann) Rydberg P. nivea subsp. rubricaulis (Lehmann) Hiitonen
Treatment appears in FNA Volume 9. Treatment on page 207. Mentioned on page 167, 206, 208, 209, 210.

Caudex branches not sheathed with marcescent whole leaves. Stems ascending to nearly erect, 1.5–4 dm. Basal leaves often both ternate and palmate on same plant, rarely subpalmate, 4–10 cm; petiole 2.5–7 cm, long hairs sparse to common, loosely appressed to ascending-spreading, 1–2 mm, ± weak to stiff, verrucose, short and/or ± crisped hairs common to abundant, cottony hairs absent, glands usually sparse; leaflets 3–5, proximalmost separated by 0 (–1) mm, central oblong to obovate, 1.5–4 × 1–2.5 cm, petiolules 0–5 mm, distal 2/3–3/4 of margin incised 1/2–3/4, rarely +, to midvein, teeth (4–) 5–8 per side, 4–5 mm, apical tufts 1 mm, abaxial surfaces gray to grayish white, long hairs abundant, cottony-crisped hairs usually dense, short hairs and glands absent or obscured, adaxial green to grayish green, long hairs sparse to common, 0.5–1.5 mm, stiff, short hairs absent or sparse, rarely common, crisped and cottony hairs absent, glands absent or sparse, rarely common. Cauline leaves 2–3. Inflorescences 4–20-flowered, open, branch angle (10–) 20–45°. Pedicels 0.5–3 cm, proximal to 5 cm. Flowers: epicalyx bractlets linear to narrowly lanceolate, 3–4 × 0.8–1.2 mm; hypanthium 4–6 mm diam.; sepals 4–5 mm, apex subacute to acute, glands usually ± sparse, not obscured; petals pale-yellow, not overlapping, 5–7 × (4–) 5–6.5 mm, distinctly longer than sepals; filaments 0.5–1.5 mm, anthers 0.4 mm; carpels 30–60, styles 0.9–1.1 mm. Achenes 1.2 mm. 2n = 56.


Phenology: Flowering summer.
Habitat: Sandy lake and stream shores, open sandy forests, dry grassy slopes, sandy and loamy bluffs, rock crevices, scree
Elevation: 0–1600 m

Distribution

V9 312-distribution-map.jpg

Alta., B.C., N.W.T., Sask., Yukon, Alaska.

Discussion

As addressed by B. Ertter et al. (2013), the name Potentilla rubricaulis is here restricted to relatively large plants with open inflorescences occurring mainly in glaciated parts of subarctic northwestern Canada and Alaska. Plants from the Chugach Mountains of southern Alaska tend to be more conspicuously glandular than elsewhere.

The distinction between Potentilla rubricaulis and large forms of P. arenosa with supernumerary leaflets is problematic. Although both species have somewhat similar petiole vestiture (long, straight, verrucose hairs and a layer of short, stiff, or curly hairs), the latter species tends to have more stiffly spreading petiole hairs and prominently petiolulate central leaflets.

The octoploid chromosome count (P. M. Dansereau and E. Steiner 1956) from Great Bear Lake area, Northwest Territories, probably belongs to Potentilla rubricaulis in the narrow sense, since that is its type locality.

Selected References

None.

Lower Taxa

None.

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

... more about "Potentilla rubricaulis"
green +  and gray +
not glaucous +  and cottony +
gray +  and grayish white +
not glaucous +  and cottony +
smooth +  and faintly rugose +
green +  and grayish green +
0.4 cm4 mm <br />0.004 m <br /> (?) +
Reidar Elven +  and Barbara Ertter +
Lehmann +
subpalmate +, palmate +  and ternate +
opposite +  and alternate +
4 cm40 mm <br />0.04 m <br /> (10 cm100 mm <br />0.1 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 +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
oblong +  and obovate +
0 cm0 mm <br />0 m <br /> (?) +
Red-stemmed cinquefoil +
Alta. +, B.C. +, N.W.T. +, Sask. +, Yukon +  and Alaska. +
not +  and aggregated +
0–1600 m +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
linear +  and narrowly lanceolate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 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 />) +
not obscured +  and obscured +
crisped +
Sandy lake and stream shores, open sandy forests, dry grassy slopes, sandy and loamy bluffs, rock crevices, scree +
stoloniferous +  and short-rhizomatous +
straight +
stiff +  and less weak +
loosely appressed +  and ascending-spreading +
common +  and sparse +
verrucose +
crisped +  and cottony-crisped +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 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 />) +
0.4 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 />) +
open +  and 4-20-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 />) +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
not overlapping +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
free +  and distinct +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
distinctly longer +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (7 cm70 mm <br />0.07 m <br />) +
1/2 +  and 3/4 +
0 cm0 mm <br />0 m <br /> (0.5 cm5 mm <br />0.005 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 /> (5 cm50 mm <br />0.05 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Nov. Stirp. Pug. +
not arillate +
persistent +
free +  and distinct +
erect +  and spreading +
lanceolate +  and broadly ovate or deltate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
free +  and distinct +
not rooting +
reddish +  and green +
(1-)1.5-4(-6) times basal leaves +
ascending +  and nearly erect +
1 +  and many +
not flagelliform +
palmate +  and pinnate +
linear;ovate +
deciduous +
distinct +
subapical +
papillate-swollen +, less columnar +  and tapered +
rough-thickened +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
Potentilla dissecta var. rubricaulis +  and P. nivea subsp. rubricaulis +
not fleshy-thickened +
Potentilla rubricaulis +
Potentilla sect. Rubricaules +
species +
5 +  and 8 +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
inconspicuous +
enlarged +
biennial +, annual +  and perennial +
herb +  and matted +