Sibbaldiopsis tridentata |
Rosaceae tribe Potentilleae |
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potentille tridentée, shrubby fivefingers, three-tooth-cinquefoil |
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Habit | Herbs, perennial, rarely annual or biennial, shrubs, or subshrubs; unarmed. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
Leaves | stipules 3–6 mm, margins villous-ciliate; petiole slender, (0.2–)0.5–6(–8) cm; leaflets dark green abaxially, light green adaxially, (0.5–)1–3(–4) × 0.4–1.5(–1.8) cm. |
alternate, rarely opposite, pinnately (palmately) compound (simple in Alchemilla, Aphanes, and Chamaerhodos); stipules persistent (absent in Chamaerhodos), adnate to petiole; venation pinnate or palmate. |
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Pedicels | 2–35 mm, glabrous. |
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Flowers | epicalyx bractlets lanceolate, 1–2 mm; sepals 2–3 mm, hirsute, glandular; petals white, sometimes pink-tinged, (4–)5–8[–11] mm; anthers reddish, 0.3–0.6 mm; styles 1–2.5(–3) mm. |
perianth and androecium perigynous; epicalyx bractlets present, sometimes absent; hypanthium usually patelliform, cupulate, or campanulate, sometimes turbinate, saucer-shaped, flat-bottomed, or subglobose to ellipsoid or ovoid; torus flat to conic or turbinate, enlarged (absent or reduced in Alchemilla, Aphanes, and Chamaerhodos); carpels 1–260, styles basal or lateral to subterminal, distinct; ovules 1(or 2), basal. |
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Fruits | aggregated achenes (achenes in Alchemilla and Aphanes); torus sometimes fleshy; styles deciduous or persistent, not elongate. |
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Achenes | dark brown. |
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2n | = 14, 28. |
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Sibbaldiopsis tridentata |
Rosaceae tribe Potentilleae |
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Phenology | Flowering summer. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
Habitat | Dry rocky to gravelly shores or maritime habitats, rocky outcrops, montane balds and promontories in mixed conifer-hardwood woodlands, dry meadows of montane conifer communities, alpine tundra, often in acidic soil | |||||||||||||||||||||||||||||||||||||||||||||||||||||
Elevation | 0–1900 m (0–6200 ft) | |||||||||||||||||||||||||||||||||||||||||||||||||||||
Distribution |
CT; GA; IA; IL; MA; MD; ME; MI; MN; NC; ND; NH; NJ; NY; PA; RI; TN; VA; VT; WI; WV; AB; MB; NB; NL; NS; NT; NU; ON; PE; QC; SK; SPM; Greenland
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North America; Mexico; Central America; South America; West Indies; Bermuda; Eurasia; Africa; Atlantic Islands; Pacific Islands; Australia |
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Discussion | Sibbaldiopsis tridentata is uncommon to rare through most of its southern range from Connecticut south to Georgia and west to Iowa, Tennessee, and North Dakota. It is more common in Canada and around the Great Lakes. The inclusion of Scotland in the distribution of the species by P. A. Rydberg (1898) is erroneous (T. Wolf 1908). of conservation concern (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Genera 14–22, species ca. 860 (14 genera, 189 species, including 1 hybrid, in the flora area). The base chromosome number for Potentilleae is mostly x = 7 (8 in Alchemilla and Aphanes; 14 in Comarum). Variation in the number of genera recognized in Potentilleae is due to differences in generic delimitation between D. Potter et al. (2007) and the authors of Potentilla and segregates here (see 9. Ivesia and 8. Potentilla for discussion). In the former, Duchesnea, Horkelia, Horkeliella, and Ivesia are included within Potentilla. Likewise, Aphanes is included within Alchemilla by Potter et al. while it is kept distinct here. Potentilla and its segregates and Fragaria are host to Phragmidium rusts, but not the other genera of the tribe. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 300. | FNA vol. 9, p. 119. | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Sibbaldiopsis | Rosaceae > subfam. Rosoideae | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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Synonyms | Potentilla tridentata, Sibbaldia tridentata | |||||||||||||||||||||||||||||||||||||||||||||||||||||
Name authority | (Aiton) Rydberg: Monogr. N. Amer. Potentilleae, 187. (1898) | Sweet: Brit. Fl. Gard. 2: sub plate 124. (1825) | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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