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Saxifraga oppositifolia

purple mountain saxifrage, purple or purple mountain saxifrage, purple saxifrage, saxifrage à feuilles opposées, twinflower saxifrage

saxifrage oeil-de-bouc, yellow marsh saxifrage

Habit Plants mat- or cushion-forming (with trailing, ± woody stems), not stoloniferous, rhizomatous. Plants loosely tufted, not stoloniferous or sometimes shortly so, rhizomatous, caudex present or not.
Leaves

cauline (marcescent, crowded), opposite (rarely alternate);

petiole absent;

blade oblong to ± broadly obovate, unlobed, 2–5 mm, leathery, margins entire, bristly-ciliate, with 1(–3) lime-secreting hydathodes (in pit, secretion obvious), apex obtuse, surfaces glabrous.

basal and cauline, (distal clasping);

petiole absent on distal leaves, otherwise ± flattened, 3–20(–35) mm;

blade linear or linear-oblanceolate to spatulate, unlobed, (5–)10–30 mm, thin to slightly fleshy, margins entire, eciliate or sparsely reddish brown-ciliate, (with apical nonsecreting hydathode), apex acuminate or acute, surfaces glabrous or sparsely reddish brown-villous.

Inflorescences

solitary flowers, ebracteate, 1–5 cm, glabrate or sparsely purple-tipped stipitate-glandular.

2(–4)-flowered cymes, sometimes solitary flowers, (flowers initially nodding), 4–30(–35) cm, sparsely to ± densely reddish brown-villous;

bracts sessile.

Flowers

sepals erect, ovate, margins stiffly ciliate or not, surfaces hairy, stipitate-glandular, or glabrous;

petals purple to pink, rarely white, often drying violet, not spotted, obovate to elliptic, (2–)5–12(–20) mm, longer than sepals;

ovary ± superior.

sepals ascending to spreading, reflexed in fruit, (sometimes purplish), triangular, margins reddish brown-ciliate, surfaces glabrous (rarely reddish brown-hairy);

petals yellow, often drying cream, often proximally orange-spotted, elliptic to oblong or obovate, 6–18 mm, 2+ times longer than sepals;

ovary superior.

Capsules

± folliclelike.

2n

= 16, 24, 32.

Saxifraga oppositifolia

Saxifraga hirculus

Phenology Flowering summer.
Habitat Wet, usually mossy, arctic or alpine tundra, wet alpine meadows
Elevation 0-4000 m [0-13100 ft]
Distribution
from FNA
AK; CO; ID; MT; NY; OR; VT; WA; WY; AB; BC; MB; NS; NT; NU; ON; QC; YT; Eurasia; arctic and alpine
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; CO; MT; NM; UT; BC; MB; NT; NU; ON; QC; YT; Greenland; Eurasia; Atlantic Islands (Iceland, Spitsbergen)
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 7 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

On the basis of a morphologic and cytologic study, O. Hedberg (1992) recognized four subspecies in Saxifraga hirculus: subsp. propinqua (2n = 16, 24), nearctic (Labrador and northwestern Greenland to Alaska); subsp. coloradoensis (2n = 16), Colorado; subsp. hirculus (2n = 32), circumboreal (Ontario to Alaska in North America); and subsp. compacta (2n = 32), mostly Arctic Eurasia, Atlantic Islands (Iceland, Spitsbergen), eastern Greenland, and Alaska. Nonetheless, we are not recognizing subspecies (see also P. K. Holmgren and N. H. Holmgren 1997); further research is needed to determine their validity.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Sepal margins bristly-ciliate
subsp. oppositifolia
1. Sepal margins glandular-ciliate
subsp. smalliana
Source FNA vol. 8, p. 136. FNA vol. 8, p. 138.
Parent taxa Saxifragaceae > Saxifraga Saxifragaceae > Saxifraga
Sibling taxa
S. adscendens, S. aizoides, S. aleutica, S. bracteata, S. bronchialis, S. cernua, S. cespitosa, S. cherlerioides, S. chrysantha, S. debilis, S. eschscholtzii, S. flagellaris, S. hirculus, S. hyperborea, S. mertensiana, S. nathorstii, S. paniculata, S. radiata, S. rivularis, S. serpyllifolia, S. taylorii, S. tricuspidata, S. tridactylites, S. vespertina
S. adscendens, S. aizoides, S. aleutica, S. bracteata, S. bronchialis, S. cernua, S. cespitosa, S. cherlerioides, S. chrysantha, S. debilis, S. eschscholtzii, S. flagellaris, S. hyperborea, S. mertensiana, S. nathorstii, S. oppositifolia, S. paniculata, S. radiata, S. rivularis, S. serpyllifolia, S. taylorii, S. tricuspidata, S. tridactylites, S. vespertina
Subordinate taxa
S. oppositifolia subsp. oppositifolia, S. oppositifolia subsp. smalliana
Synonyms Hirculus prorepens, Leptasea hirculus, S. hirculus subsp. coloradensis, S. hirculus subsp. compacta, S. hirculus subsp. propinqua, S. hirculus var. propinqua
Name authority Linnaeus: Sp. Pl. 1: 402. 1753 , Linnaeus: Sp. Pl. 1: 402. 1753 ,
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