Difference between revisions of "Potentilla elegans"

Revision as of 20:36, 24 September 2019

Copyright: Flora of North America Association

Plants densely tufted to cushion-forming; caudex branches usually short, stout, sometimes embedded in old leaves. Stems erect, 0.1–0.5 dm, lengths 1–2 times leaves. Basal leaves not in ranks, ternate, 0.5–2.5(–4) cm; stipules: apex acute to obtuse; petiole 0.2–1.8(–2.5) cm, long hairs ± sparse, ± spreading, 0.2–1 mm, weak, glands sparse to abundant; leaflets 3, central obtriangular to flabellate, 0.5–0.7(–1) × 0.5–0.7 cm, petiolule 0–0.5 mm, margins flat, distal 3/4+ deeply 3–5-lobed (sinuses extending 2/3–3/4 to midvein), lobes unevenly incised 1/4–1/2 to midvein, teeth 1–3(–5) per lobe, surfaces similar, green, brownish, or reddish, hairs absent or sparse, 0.2–0.5 mm, glands sparse to common (also densely punctate-glandular). Inflorescences 1-flowered. Pedicels straight or ± curved, 0–0.5(–2) cm in flower, to 5 cm in fruit. Flowers: epicalyx bractlets linear, elliptic, or obovate, 2–2.2 × 0.8–1.1 mm, margins flat; hypanthium 2.5–3.5 mm diam.; sepals 2.2–2.5 mm, apex broadly acute to obtuse; petals pale yellow, 3–3.5 × 3–3.5 mm; filaments 1–1.5 mm, anthers 0.3–0.4 mm; carpels 20–25, styles ± columnar, not papillate-swollen proximally, 0.7–0.9 mm. Achenes 1.2 mm. 2n = 14, 28 (Russian Far East).

Phenology: Flowering spring–summer.
Habitat: Rock crevices, blocky scree, mountain summits, mostly on acidic bedrock
Elevation: 100–1600 m

B.C., N.W.T., Yukon, Alaska, e Asia (Russian Far East).

Discussion

For present purposes, Potentilla elegans is treated in sect. Aureae, as was done by B. C. Johnston (1985), largely on the basis of pragmatism. J. Soják (1994) places the species instead in sect. Dumosae Soják, which otherwise comprises several Himalayan species.

Selected References

None.

Lower Taxa