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Saddle Mountain saxifrage

Marshall's saxifrage

large-petal saxifrage, razshivin's saxifrage

Habit Plants solitary or in clumps, short-rhizomatous. Plants in groups or sometimes mat-forming, rhizomatous. Plants solitary or in clusters, rhizomatous.
Leaves

basal;

petiole often indistinct, flattened, 5–50 mm;

blade elliptic to obovate, 4–12 cm, slightly fleshy, base cuneate, margins serrate to dentate, densely ciliate, surfaces densely tangled-hairy.

basal;

petiole flattened, 3–15 cm;

blade ovate, 1–5 cm, ± fleshy, base attenuate, margins shallowly crenate-serrate (teeth ca. 2 mm), eciliate, surfaces sparsely tangled, reddish brown-hairy abaxially, glabrate adaxially.

basal;

petiole ± distinct to indistinct, flattened, (0.3–)0.5–3 cm;

blade oblanceolate to narrowly oblanceolate or narrowly spatulate, sometimes ± narrowly obovate, (0.5–)0.9–3.5 cm, ± fleshy, base ± attenuate to cuneate, margins (3–)5–7(–9)-toothed in distal 1/2 (teeth 0.5 mm), sparsely ciliate, surfaces glabrous.

Inflorescences

70+-flowered, open, lax, flat-topped thyrses, 15–35 cm, tangled, yellow-tipped stipitate-glandular.

15–50+-flowered, open, lax thyrses, 20–40 cm, purple-tipped stipitate-glandular.

(2–)4–16-flowered, open, racemiform, sometimes paniculiform thyrses, sometimes solitary flowers, 3–15.5(–17 in fruit) cm, glabrous; (bracts reduced).

Flowers

sepals reflexed, elliptic to ovate;

petals white, not spotted, elliptic, clawed, 2–5 mm, longer than sepals;

filaments linear, flattened;

pistils connate to 1/2 their lengths;

ovary 1/2 inferior, appearing more superior in fruit.

sepals reflexed, lanceolate to oblong;

petals white, with 2 basal yellow spots (often faded when dried), ovate, clawed, 1.5–4.5 mm, longer than sepals;

filaments strongly club-shaped, sometimes petaloid (short-clawed, equaling petals);

pistils distinct almost to base;

ovary superior, (to 1/3 adnate to hypanthium).

sepals reflexed, oblong or lanceolate to ovate;

petals white to cream, often purplish, not spotted, linear to ± narrowly elliptic, not clawed, 2–4 mm, usually longer to sometimes shorter than sepals;

filaments linear, flattened;

pistils connate 1/2+ their lengths, (conic);

ovary ± 1/2 inferior.

Capsules

greenish to reddish purple, folliclelike.

greenish to reddish purple, folliclelike.

dark purple-black, valvate.

2n

= 76.

= 20.

Micranthes hitchcockiana

Micranthes marshallii

Micranthes razshivinii

Phenology Flowering late spring–summer. Flowering spring. Flowering summer.
Habitat Wet rocks and ledges on mountain-top balds Deeply shaded watercourses, stream banks, seeps Tundra, stream banks, alpine rocky slopes
Elevation 600-1100 m [2000-3600 ft] 100-1000 m [300-3300 ft] 400-2000 m [1300-6600 ft]
Discussion

Of conservation concern.

Micranthes hitchcockiana may have originated from hybridization between M. rufidula and M. oregana (P. E. Elvander 1984; W. E. Perkins 1978).

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

Micranthes razshivinii is found in eastern Alaska (eastern Brooks Range, from Atigun Pass eastward and from Mount McKinley National Park eastward) into Yukon and in the Mackenzie and Richardson mountains in the Northwest Territories. Its leaves are generally narrower than those of M. calycina and the teeth are less numerous. The glabrous inflorescence branches of M. razshivinii readily distinguish it from M. calycina, which has hairy branches. The ranges of the two species may overlap or at least abut in the Atigun Pass area of the Brooks Range, in the Mount McKinley National Park area, and possibly in the Saint Elias Mountains. Hybrids would be very difficult to distinguish from the parents but may occur. They have not been observed in the material examined. Plants of this species sometimes have been misidentified as M. davurica (Willdenow) Small, a species restricted to eastern Siberia.

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

Distribution
from FNA
OR
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; NT; YT
[BONAP county map]
Parent taxa Saxifragaceae > Micranthes Saxifragaceae > Micranthes Saxifragaceae > Micranthes
Sibling taxa
M. apetala, M. aprica, M. bryophora, M. californica, M. calycina, M. careyana, M. caroliniana, M. eriophora, M. ferruginea, M. foliolosa, M. fragosa, M. gaspensis, M. gormanii, M. hieraciifolia, M. howellii, M. idahoensis, M. integrifolia, M. lyallii, M. marshallii, M. micranthidifolia, M. nelsoniana, M. nidifica, M. nivalis, M. nudicaulis, M. occidentalis, M. odontoloma, M. oregana, M. palmeri, M. pensylvanica, M. petiolaris, M. razshivinii, M. reflexa, M. rhomboidea, M. rufidula, M. spicata, M. stellaris, M. subapetala, M. tempestiva, M. tenuis, M. texana, M. tischii, M. tolmiei, M. unalaschcensis, M. virginiensis
M. apetala, M. aprica, M. bryophora, M. californica, M. calycina, M. careyana, M. caroliniana, M. eriophora, M. ferruginea, M. foliolosa, M. fragosa, M. gaspensis, M. gormanii, M. hieraciifolia, M. hitchcockiana, M. howellii, M. idahoensis, M. integrifolia, M. lyallii, M. micranthidifolia, M. nelsoniana, M. nidifica, M. nivalis, M. nudicaulis, M. occidentalis, M. odontoloma, M. oregana, M. palmeri, M. pensylvanica, M. petiolaris, M. razshivinii, M. reflexa, M. rhomboidea, M. rufidula, M. spicata, M. stellaris, M. subapetala, M. tempestiva, M. tenuis, M. texana, M. tischii, M. tolmiei, M. unalaschcensis, M. virginiensis
M. apetala, M. aprica, M. bryophora, M. californica, M. calycina, M. careyana, M. caroliniana, M. eriophora, M. ferruginea, M. foliolosa, M. fragosa, M. gaspensis, M. gormanii, M. hieraciifolia, M. hitchcockiana, M. howellii, M. idahoensis, M. integrifolia, M. lyallii, M. marshallii, M. micranthidifolia, M. nelsoniana, M. nidifica, M. nivalis, M. nudicaulis, M. occidentalis, M. odontoloma, M. oregana, M. palmeri, M. pensylvanica, M. petiolaris, M. reflexa, M. rhomboidea, M. rufidula, M. spicata, M. stellaris, M. subapetala, M. tempestiva, M. tenuis, M. texana, M. tischii, M. tolmiei, M. unalaschcensis, M. virginiensis
Synonyms Saxifraga hitchcockiana Saxifraga marshallii Saxifraga razshivinii
Name authority (Elvander) Brouillet & Gornall: Novon 18: 138. 2008 , (Greene) Small: in N. L. Britton et al., N. Amer. Fl. 22: 145. 1905 , (Zhmylev) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1021. (2007)
Source Flora of North America vol. 8, p. 70. Flora of North America vol. 8, p. 63. Flora of North America vol. 8, p. 59.
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