Potentilla crebridens subsp. hemicryophila

Jurtzev in A. I. Tolmatchew

in A. I. Tolmatchew, Fl. Arct. URSS 9(1): 318. 1984.

Illustrated
Synonyms: Potentilla matsuokana subsp. hemicryophila (Jurtzev) Soják
Treatment appears in FNA Volume 9. Treatment on page 198.

Plants ± tufted. Caudex branches slender to stout, not columnar, not sheathed with marcescent whole leaves. Stems ascending to erect, 0.8–2 dm, lengths 2–3 (–4) times basal leaves. Basal leaves 3–8 cm; petiole 0.5–5 cm, cottony hairs usually dense, sometimes sparse, other hair types and glands absent or obscured; leaflets ± overlapping, central obovate, 0.6–2 × 0.5–1.2 cm, subsessile, base cuneate, margins slightly revolute, distal 3/4 to nearly whole length incised 1/4–1/3 (–1/2) to midvein, teeth (3–) 5–8 (–12) per side, approximate, surfaces ± to strongly dissimilar, abaxial ± white, long hairs 0.7–1.2 mm, cottony-crisped hairs usually dense, adaxial green to grayish green, long hairs sparse to abundant, short and/or crisped hairs sparse to abundant. Cauline leaves 0–1. Inflorescences 1–6-flowered. Pedicels 1–1.5 cm in flower, to 3 cm in fruit. Flowers: epicalyx bractlets linear, 3–5 × 0.2–0.6 mm, usually less than 1/4 as wide as sepals, margins flat, red-glands absent; hypanthium 4–4.5 mm diam.; sepals 5–6 mm, apex acute; petals 5–7 × 5–8 mm, slightly longer than sepals; filaments 1 mm, anthers 0.4 mm; carpels 25–30, apical hairs absent, styles columnar, not or ± papillate-swollen on less than proximal 1/5, 0.9–1.1 mm. Achenes 1.1 mm. 2n = 28 (Russian Far East).


Phenology: Flowering summer.
Habitat: Dry alpine ridges and meadows, well-drained slopes, rocky outcrops, scree, on calcareous bedrock
Elevation: 0–1500 m

Distribution

V9 298-distribution-map.jpg

Yukon, Alaska, Asia (Russian Far East), Asia (Siberia)

Discussion

Nearly half of the Alaska and Yukon (Beringian) specimens previously assigned to Potentilla nivea belongs to P. crebridens subsp. hemicryophila, which is tetraploid; P. nivea is high polyploid. Intermediates were not seen, and the two species may be reproductively isolated by the ploidal difference. See B. A. Jurtzev (1984) for additional character differences.

Selected References

None.

Lower Taxa

None.

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

reddish +, yellowish white +, gray +  and white +
cottony-crisped +
reddish +, yellowish white +, gray +  and white +
cottony-crisped +
cottony-crisped +
rugose +  and smooth +
green +  and grayish green +
0.4 cm4 mm <br />0.004 m <br /> (?) +
Reidar Elven +, David F. Murray +  and Barbara Ertter +
Jurtzev in A. I. Tolmatchew +
compound +  and simple +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 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 +
slender +  and stout +
0.6 cm6 mm <br />0.006 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Yukon +, Alaska +, Asia (Russian Far East) +  and Asia (Siberia) +
not +  and aggregated +
0–1500 m +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
1 cm10 mm <br />0.01 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 ridges and meadows, well-drained slopes, rocky outcrops, scree, on calcareous bedrock +
stoloniferous +  and short-rhizomatous +
straight +
less appressed +  and spreading +
sparse +  and abundant +
crisped +  and cottony-crisped +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 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 /> (0.45 cm4.5 mm <br />0.0045 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 +
obtriangular +, suborbiculate +, elliptic +  and obovate +
linear +  and oblanceolate +
palmate +  and pinnate +
1/4 +  and 1/3-1/2 +
inferior +  and superior +
clustered +, biseriate +  and superposed +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
0 cm0 mm <br />0 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
free +  and distinct +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
slightly longer +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (5 cm50 mm <br />0.05 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 />) +
in A. I. Tolmatchew, Fl. Arct. URSS +
not arillate +
persistent +
free +  and distinct +
erect +  and spreading +
lanceolate +  and broadly ovate or deltate +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Illustrated +
free +  and distinct +
not rooting +
reddish +  and green +
2-3(-4) times basal leaves +
ascending +  and erect +
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 +  and columnar +
rough-thickened +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
Potentilla matsuokana subsp. hemicryophila +
not fleshy-thickened +
Potentilla crebridens subsp. hemicryophila +
Potentilla crebridens +
subspecies +
5 +  and 8 +
inconspicuous +
enlarged +
biennial +, annual +  and perennial +