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Saxifraga oppositifolia

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

thyme-leaf saxifrage

Habit Plants mat- or cushion-forming (with trailing, ± woody stems), not stoloniferous, rhizomatous. Plants mat-forming, not stoloniferous, rhizomatous.
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, (cauline 1–4);

petiole absent;

blade linear (cauline) or oblong to oblanceolate or spatulate, unlobed, 2–8.5 mm, fleshy, margins (recurved), entire, eciliate, apex obtuse, not mucronate, surfaces glabrous or glabrate.

Inflorescences

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

solitary flowers, 2–7 cm, sparsely to densely pink- to purple-tipped stipitate-glandular;

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 erect to spreading (reflexed in fruit, often purplish), broadly ovate to elliptic, margins eciliate or sometimes sparsely ciliate, surfaces glabrous;

petals pale yellow, rarely purple, faded when dried, not spotted, elliptic to obovate, 4–8 mm, longer than sepals;

ovary superior.

Capsules

± folliclelike.

2n

= 16 (Russia).

Saxifraga oppositifolia

Saxifraga serpyllifolia

Phenology Flowering summer.
Habitat Moist to dry sandy areas, cliffs, gravelly ridges, scree, tundra
Elevation 0-2200 m [0-7200 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; NT; NU; YT; Asia (Japan, Siberia)
[BONAP county map]
Discussion

Subspecies 7 (2 in the flora).

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

The purple-flowered variant of Saxifraga serpyllifolia has been called var. purpurea.

(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. 139.
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. hirculus, S. hyperborea, S. mertensiana, S. nathorstii, S. oppositifolia, S. paniculata, S. radiata, S. rivularis, S. taylorii, S. tricuspidata, S. tridactylites, S. vespertina
Subordinate taxa
S. oppositifolia subsp. oppositifolia, S. oppositifolia subsp. smalliana
Synonyms S. serpyllifolia var. purpurea
Name authority Linnaeus: Sp. Pl. 1: 402. 1753 , Pursh: Fl. Amer. Sept. 1: 310. 1813 ,
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