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spotted saxifrage, yellowdot saxifrage

Merten's or wood or woodland saxifrage, Mertens' saxifrage, wood saxifrage, woodland saxifrage

Habit Plants mat-forming, (stems trailing), not stoloniferous, rhizomatous. Plants solitary or in clumps, not stoloniferous, with caudex or short-rhizomatous.
Leaves

basal and cauline, (marcescent, crowded);

petiole absent;

blade (sometimes reddish), linear or linear-lanceolate to narrowly elliptic, unlobed, 3–15 mm, leathery, margins entire, stiffly, often hooked, white-ciliate, sometimes also glandular-ciliate, apex acute, white spinulose-mucronate (spine 1–1.5 mm), surfaces glabrous, sometimes adaxially sparsely sessile-glandular.

basal and cauline, (basal persistent, cauline ± inconspicuous);

petiole rounded, 2–20 mm;

blade round to reniform, irregularly shallowly lobed, 20–80(–100) mm, thin, margins serrate, stipitate glandular-ciliate, apex obtuse to rounded, surfaces sparsely hairy.

Inflorescences

2–15-flowered cymes or thyrses, sometimes solitary flowers, 5–20 cm, sparsely short stipitate-glandular;

bracts sessile.

30+-flowered, open, much-branched thyrses, usually some or all flowers replaced by bulbils (sometimes bulbils absent), 15–40 cm, dark purple-tipped stipitate-glandular;

bracts (± inconspicuous), petiolate or sessile.

Flowers

sepals ± erect, (purplish), ovate to triangular, margins eciliate or sparsely glandular, surfaces glabrous or sparsely sessile-glandular;

petals yellowish white, purple- or red- to yellow-spotted, oblong to elliptic, 3–7 mm, longer than sepals;

ovary superior.

sepals reflexed (at least in fruit), ovate to elliptic, margins eciliate, surfaces sparsely stipitate-glandular or glabrous;

petals white, not spotted, narrowly ovate to elliptic, (3–)4–6 mm, longer than sepals;

filaments strongly club-shaped;

ovary superior.

2n

= 36, ca. 48, 50.

Saxifraga bronchialis

Saxifraga mertensiana

Phenology Flowering spring–summer.
Habitat Moist to wet stream banks, mossy cliffs and slopes, waterfall spray zones
Elevation 0-2500 m (0-8200 ft)
Distribution
from FNA
AK; CO; ID; MT; NM; OR; UT; WA; WY; AB; BC; NT; YT; Eurasia; arctic and alpine areas
[WildflowerSearch map]
from FNA
AK; CA; ID; MT; OR; WA; AB; BC
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 4 (2 in the flora).

The Saxifraga bronchialis complex, including S. cherlerioides, S. taylorii, S. tricuspidata, and S. vespertina, needs a thorough study.

Saxifraga firma Litvinov ex Losina-Losinskaja has been cited for North America; the name belongs in synonymy of a Eurasian subspecies and appears to have been misapplied to North American specimens.

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

Plants of Saxifraga mertensiana bear bulbils in the axils of basal leaves.

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

Key
1. Petals yellow-spotted, distinctly clawed.
subsp. funstonii
1. Petals yellow-spotted proximally, purple- or red-spotted distally, not clawed.
subsp. austromontana
Source FNA vol. 8, p. 140. FNA vol. 8, p. 146.
Parent taxa Saxifragaceae > Saxifraga Saxifragaceae > Saxifraga
Sibling taxa
S. adscendens, S. aizoides, S. aleutica, S. bracteata, 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. 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. nathorstii, S. oppositifolia, S. paniculata, S. radiata, S. rivularis, S. serpyllifolia, S. taylorii, S. tricuspidata, S. tridactylites, S. vespertina
Subordinate taxa
S. bronchialis subsp. austromontana, S. bronchialis subsp. funstonii
Synonyms S. mertensiana var. eastwoodiae
Name authority Linnaeus: Sp. Pl. 1: 400. 1753 , Bongard: Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. 6, Sci. Math. 2: 141. 1832 ,
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