Potentilla subgorodkovii

Jurtzev

Bot. Zhurn. (Moscow & Leningrad) 78: 83. 1993.

Treatment appears in FNA Volume 9. Treatment on page 204. Mentioned on page 196, 198, 202, 203.

Plants ± densely tufted. Caudex branches stout, usually columnar, sometimes sheathed with marcescent whole leaves. Stems erect, (0.2–) 0.3–1.5 (–2) dm, lengths 1.5–2.5 (–3.5) times basal leaves. Basal leaves (1–) 2–10 (–15) cm; petiole (0.5–) 1–5 (–12) cm, long hairs common to dense, ± ascending to loosely appressed, sometimes spreading, 1–2 mm, ± soft, smooth, crisped/short-cottony hairs usually sparse, sometimes absent or common, glands absent, sparse, or obscured; leaflets separate to slightly overlapping, central obovate or obtriangular, (0.5–) 1–2 (–3) × (0.4–) 0.8–1.5 (–2) cm, sessile or subsessile, base cuneate, margins revolute, distal (1/3–) 1/2–2/3 (–3/4) incised 1/2–2/3 (–3/4) to midvein, teeth 2–3 (–4) per side, usually ± distant, surfaces somewhat to more often strongly dissimilar, abaxial yellowish or grayish white to white, long hairs 0.8–1.5 mm, cottony-crisped hairs ± dense, adaxial green to grayish green, long hairs sparse to ± abundant, other hairs usually absent. Cauline leaves (0–) 1 (–2). Inflorescences usually 1 (–2) -flowered, rarely to 5-flowered. Pedicels (0.5–) 2–4 cm in flower, to 5 cm in fruit. Flowers: epicalyx bractlets elliptic-lanceolate to ovate, (3–) 4–6 (–7) × (0.8–) 1.2–2 (–2.5) mm, (1/2–) 2/3 to as wide as sepals, margins revolute, rarely flat, red-glands absent; hypanthium 2.5–4 mm diam.; sepals 4–6 (–7) mm, apex subacute; petals (5–) 6–9 × (5–) 7–9 mm, significantly longer than sepals; filaments 1–1.3 mm, anthers 0.4–0.6 mm; carpels 30–40, apical hairs absent, styles narrowly columnar to conic-tapered, papillate-swollen on proximal 1/5 (–1/3), 0.9–1.1 mm. Achenes 1.2–2 mm. 2n = 28, 42, 49, 56 (Russian Far East).


Phenology: Flowering late spring to summer.
Habitat: Dry alpine heaths, exposed ridges and summits, rock outcrops, scree and talus, dry tundra, acidic and calcareous bedrock
Elevation: 0–4300 m

Distribution

V9 309-distribution-map.jpg

Alta., B.C., N.W.T., Nunavut, Yukon, Alaska, Colo., Mont., Utah, Wyo., Asia (Russian Far East), Asia (Sakha [Yakutia])

Discussion

The name Potentilla subgorodkovii was coined for a presumed hybrid species resulting from P. crebridens × P. subvahliana; here it is applied in a collective meaning for plants combining characteristics from multiple species of the P. uniflora/villosa and P. nivea groups. Morphologically, this collective entity is much closer to the P. uniflora/villosa group than to the P. nivea group and is clearly different from primary hybrids and clones, which are often observed.

Potentilla subgorodkovii constitutes about half of what previously has been considered P. uniflora in Alaska and Yukon and is the only such entity fully confirmed south of northern British Columbia. These southern populations occur outside the range of possible parental members of the P. uniflora/villosa group and do not support the hybrid hypothesis. They may instead represent a distinct species, not yet described.

Selected References

None.

Lower Taxa

None.

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

... more about "Potentilla subgorodkovii"
56 +, 49 +, 42 +  and 28 +
reddish +, yellowish white +, gray +  and white +
cottony-crisped +
reddish +, yellowish white +, gray +  and white +
cottony-crisped +
grayish white +  and white +
cottony-crisped +
rugose +  and smooth +
1.2mm +  and 2mm +
green +  and grayish green +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Reidar Elven +, David F. Murray +  and Barbara Ertter +
Jurtzev +
compound +  and simple +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
2 cm20 mm <br />0.02 m <br /> (10 cm100 mm <br />0.1 m <br />) +
cuneate +
Niveae +
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 +
subsessile +  and sessile +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
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 /> (2 cm20 mm <br />0.02 m <br />) +
obtriangular +  and obovate +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Alta. +, B.C. +, N.W.T. +, Nunavut +, Yukon +, Alaska +, Colo. +, Mont. +, Utah +, Wyo. +, Asia (Russian Far East) +  and Asia (Sakha [Yakutia]) +
not +  and aggregated +
0–4300 m +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
elliptic-lanceolate +  and ovate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.13 cm1.3 mm <br />0.0013 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 />) +
crisped +
Dry alpine heaths, exposed ridges and summits, rock outcrops, scree and talus, dry tundra, acidic and calcareous bedrock +
stoloniferous +  and short-rhizomatous +
straight +
spreading +, less ascending +  and loosely appressed +
sparse +  and more or less abundant +
cottony-crisped +
0.08 cm0.8 mm <br />8.0e-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 />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 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 />) +
5-flowered +  and 1(-2)-flowered +
crassinucellate +
bipinnate +, odd-pinnate +, subpalmate +, palmate +  and ternate +
opposite +  and alternate +
marcescent +
well-developed +
persistent +
cauline +  and basal +
reduced +
separate +  and slightly overlapping +
obtriangular +, suborbiculate +, elliptic +  and obovate +
linear +  and oblanceolate +
palmate +  and pinnate +
1/2 +  and 2/3-3/4 +
inferior +  and superior +
clustered +, biseriate +  and superposed +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0 cm0 mm <br />0 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
free +  and distinct +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
significantly longer +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
5 cm50 mm <br />0.05 m <br /> (12 cm120 mm <br />0.12 m <br />) +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
Flowering late spring to 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 />) +
Bot. Zhurn. (Moscow & Leningrad) +
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 +
1.5-2.5(-3.5) times basal leaves +
1 +  and many +
not flagelliform +
palmate +  and pinnate +
linear;ovate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
deciduous +
distinct +
proximal +  and subapical +
papillate-swollen +, narrowly columnar +  and conic-tapered +
rough-thickened +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
not fleshy-thickened +
Potentilla subgorodkovii +
Potentilla sect. Niveae +
species +
2 +  and 3 +
inconspicuous +
enlarged +
biennial +, annual +  and perennial +