Difference between revisions of "Potentilla crebridens subsp. hemicryophila"

Jurtzev in A. I. Tolmatchew

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

Selected by author to be illustrated
Synonyms: Potentilla matsuokana subsp. hemicryophila (Jurtzev) Soják
Treatment appears in FNA Volume 9. Treatment on page 198.
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|publication year=1984
 
|publication year=1984
 
|special status=Selected by author to be illustrated
 
|special status=Selected by author to be illustrated
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V9/V9_298.xml
+
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V9/V9_298.xml
 
|subfamily=Rosaceae subfam. Rosoideae
 
|subfamily=Rosaceae subfam. Rosoideae
 
|tribe=Rosaceae tribe Potentilleae
 
|tribe=Rosaceae tribe Potentilleae

Revision as of 20:36, 24 September 2019

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, 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.
Reidar Elven +, David F. Murray +  and Barbara Ertter +
Jurtzev in A. I. Tolmatchew +
Niveae +
Yukon +, Alaska +, Asia (Russian Far East +  and Siberia). +
0–1500 m +
Dry alpine ridges and meadows, well-drained slopes, rocky outcrops, scree, on calcareous bedrock +
Flowering summer. +
in A. I. Tolmatchew, Fl. Arct. URSS +
Selected by author to be illustrated +
Potentilla matsuokana subsp. hemicryophila +
Potentilla crebridens subsp. hemicryophila +
Potentilla crebridens +
subspecies +