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Matted saxifrage, saxifraga vespertina, spotted saxifrage, yellow dot saxifrage

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

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

cauline (crowded proximally);

petiole absent;

blade spatulate, unlobed or minutely 3-toothed or -lobed apically, 4–11 mm, leathery, margins entire, (not cartilaginous), stiffly ciliate, apex rounded or obtuse, mucronate, surfaces glabrous.

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

3–6-flowered cymes, 2.5–12 cm, pink- to purple-tipped 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, ovate to oblong, margins sparsely ciliate, surfaces glabrous;

petals white to cream, yellow-spotted proximally, red- or orange-spotted distally, these often faded in dried specimens, elliptic, 4–6 mm, much 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

= 26.

= 36, ca. 48, 50.

Saxifraga vespertina

Saxifraga mertensiana

Phenology Flowering summer. Flowering spring–summer.
Habitat Rocky slopes, ledges, crevices Moist to wet stream banks, mossy cliffs and slopes, waterfall spray zones
Elevation 100-1800 m (300-5900 ft) 0-2500 m (0-8200 ft)
Distribution
from FNA
OR; WA
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; CA; ID; MT; OR; WA; AB; BC
[WildflowerSearch map]
[BONAP county map]
Discussion

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

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

Source FNA vol. 8, p. 142. FNA vol. 8, p. 146.
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. serpyllifolia, S. taylorii, S. tricuspidata, S. tridactylites
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
Synonyms Leptasea vespertina, S. bronchialis subsp. vespertina, S. bronchialis var. vespertina S. mertensiana var. eastwoodiae
Name authority (Small) Fedde: Just’s Bot. Jahresber. 33(1): 613. (1906) Bongard: Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. 6, Sci. Math. 2: 141. 1832 ,
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