Potentilla norvegica
Potentilla erecta
Norwegian cinquefoil, Norwegian or rough cinquefoil, potentille de norvège, rough cinquefoil
erect cinquefoil, tormentil
ascending to erect, (0.5–)2–5(–9) dm, hairs at base ± stiff, tubercle-based, glands absent or sparse, inconspicuous.
mostly ascending to erect, not flagelliform, openly branched, not rooting at nodes, (0.5–)1–5(–7) dm.
ternate, rarely palmate, 3–15(–20) cm;
petiole 1–6(–10) cm, long hairs sparse to abundant, spreading to ascending, 1–2.5(–3) mm, usually ± stiff, ± crisped hairs absent or sparse to common, glands absent or sparse, inconspicuous;
leaflets 3(–5), at tip of leaf axis, separate to ± overlapping, largest ones broadly oblanceolate or elliptic to obovate, 1–6(–10) × 0.7–4(–5) cm, distal (1/2–)2/3–3/4+ of margin usually ± evenly incised 1/4–1/3 to midvein, teeth (3–)4–8(–15) per side, surfaces sparsely to moderately hairy, sometimes glabrate or abundantly hairy, glands mostly absent.
ephemeral, usually ternate, 2–15 cm;
petiole (1–)3–13 cm, long hairs sparse to common, appressed, 0.5–1 mm, stiff, glands absent;
leaflets 3(–5), central ± obovate to cuneate, (0.5–)1–2 × (0.3–)1–1.5 cm, distal 1/2–2/3 of margin incised ± 1/3 to midvein, teeth 2–4 per side, surfaces similar, green (abaxial sometimes paler), glabrate or sparsely to moderately hairy.
(0–)1–3(–7) proximal to 1st flowering node, expanded at anthesis, usually ternate, rarely palmate (or appearing so because of leafletlike stipules), (0.5–)1–3 cm;
petiole usually 0 cm;
leaflets 3(–5), usually much narrower than those of basal leaves, narrowly cuneate to oblanceolate, (0.5–)1–3 × (0.2–)0.5–1 cm, distal 1/3–2/3 of margin incised ± 1/2 to midvein, teeth 2–4(–6) per side, apex usually obtuse to acute.
5–40+-flowered.
3–30-flowered, cymose, open.
(0.2–)0.5–2.5(–3) cm.
(1–)2–3(–5) cm.
epicalyx bractlets ± elliptic to narrowly ovate, (3–)4–8(–13) × 1.5–3(–5) mm;
hypanthium 4–7 mm diam.;
sepals 5–8 mm, apex acute to obtuse;
petals yellow, broadly obovate, (2–)3–5 × 2–4 mm;
stamens 15 or 20, filaments 0.7–2 mm, anthers 0.3–0.5 mm;
carpels 60–150, styles 0.7–0.8 mm.
4(–5)-merous;
epicalyx bractlets ovate to narrowly elliptic, 1.5–4 × 0.5–1 mm, much smaller than to sometimes equal to sepals;
hypanthium 1.5–2.5 mm diam.;
sepals (2–)3–5 mm, apex broadly acute;
petals (2–)4–6 × (1.5–)3–6 mm, apex ± retuse;
stamens 15–20, filaments 2–3.8 mm, anthers 0.4–0.6 mm;
carpels 4–8(–20), styles 0.9–1.4 mm.
tan to brown, 0.8–1.3 mm, usually strongly rugose, without a corky protuberance.
1.2–2 mm, rugose.
erect to horizontal, irregularly thickened, 1–8 cm.
= 42, 56, 63, 70.
= 28 (Eurasia).
Potentilla norvegica
Potentilla erecta
Potentilla norvegica is considered native in both North America and Eurasia, with the American race occasionally recognized as subsp. hirsuta for the stiff hairs on the stems, petioles, and pedicels of most plants in the flora area. This feature and other purported differences between the two races, in addition to being relatively subtle and inconstant, can be found in both America and Eurasia, though undoubtedly at least in part as introductions. Some populations in eastern Canada with glabrous stems have been distinguished as var. labradorica (for example, M. L. Fernald 1950), but such plants typically are intermixed with hairy individuals. The Löves (Á Löve 1954; Á Löve and D. Löve 1966) have argued that all three variants should be treated as distinct species due to chromosomal differences (hirsuta 2n = 56; labradorica 2n = 42; norvegica in the narrow sense 2n = 70) and obligate apomixis. Further research is needed to determine the taxonomic validity and rank of these expressions. If treated as species, P. flexuosa antedates P. labradorica (as noted by J. Soják 1969), while P. monspeliensis, although commonly used for the American race, is based on a European type (as summarized by A. Kurtto et al. in J. Jalas et al. 1972+, vol. 13).
An even greater challenge is determining native versus introduced ranges, especially given the likelihood that both native and Eurasian populations are widespread in North America. Achenes are produced prolifically and easily dispersed, to the extent that Potentilla norvegica is a contaminant in clover and hay fields and considered a weed at least in Canada (P. A. Werner and J. D. Soule 1976).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Although included here, Potentilla erecta is questionably extant as a naturalized species in North America and is not currently known from Newfoundland where historically reported. It is a medicinal plant called tormentil, high in tannins and strongly astringent. A tea made from the tuberous rootstock is widely used in Europe and parts of Asia for diarrhea, dysentery, sore throats, and related problems. A decoction is a mild antibiotic used for cuts and minor infections, especially as an anti-inflammatory for gingivitis and other gum problems. The rootstock is used as a red dye.
Another synonym with a long history of use is Potentilla tormentilla Necker, illegitimate by virtue of being superfluous.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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