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thyme-leaf saxifrage

prickly saxifrage, saxifrage à trois dents, three-tooth saxifrage

Habit Plants mat-forming, not stoloniferous, rhizomatous. Plants loosely mat-forming, (stems trailing), not stoloniferous, with elongate caudex or rhizomatous.
Leaves

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.

cauline, (marcescent, crowded proximally);

petiole absent;

blade (often reddish), linear to cuneate, 1–3-lobed or -toothed apically (distal cauline unlobed), rarely all unlobed, (lobes long spinose-mucronate), 5–20 mm, leathery, margins entire, softly glandular-ciliate, (nonsecreting hydathodes present adaxially), apex acute, long spinose-mucronate, surfaces glabrous.

Inflorescences

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

bracts sessile.

3–10-flowered cymes, 4–10(–24) cm, white to sparsely pink- to purple-tipped stipitate-glandular;

bracts sessile.

Flowers

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.

sepals erect to ascending, (sometimes purplish), triangular-ovate, margins ± glandular-ciliate, surfaces white to purple-tipped stipitate-glandular;

petals white to cream, proximally to distally yellow-, orange-, and red-spotted, elliptic to ovate, 4–7 mm, much longer than sepals;

ovary superior.

2n

= 16 (Russia).

= 26.

Saxifraga serpyllifolia

Saxifraga tricuspidata

Phenology Flowering summer. Flowering late spring–summer.
Habitat Moist to dry sandy areas, cliffs, gravelly ridges, scree, tundra Open sandy, gravelly, or rocky sites, forest openings, grassy slopes, rocky ridges, stony tundra
Elevation 0-2200 m (0-7200 ft) 0-3000 m (0-9800 ft)
Distribution
from FNA
AK; NT; NU; YT; Asia (Japan, Siberia)
[BONAP county map]
from FNA
AK; MI; AB; BC; LB; MB; NT; NU; ON; QC; SK; YT; Greenland
[WildflowerSearch map]
[BONAP county map]
Discussion

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

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

The rare, entire-leaved form of Saxifraga tricuspidata can be confused with S. bronchialis; it has glandular-ciliate margins instead of stiffly hooked-ciliate ones.

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

Source FNA vol. 8, p. 139. FNA vol. 8, p. 142.
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. oppositifolia, S. paniculata, S. radiata, S. rivularis, 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. serpyllifolia, S. taylorii, S. tridactylites, S. vespertina
Synonyms S. serpyllifolia var. purpurea
Name authority Pursh: Fl. Amer. Sept. 1: 310. 1813 , Rotbøll: Skr. Kiøbenhavnske Selsk. Laerd. Elsk. 10: 446. 1770 (as 3cuspidata) ,
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