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Lyall's saxifrage, red-stem saxifrage

brook saxifrage, stream saxifrage, streambank saxifrage

Habit Plants solitary or sometimes mat-forming, rhizomatous. Plants solitary or sometimes grouped, rhizomatous.
Leaves

basal;

petiole rounded to flattened, 2–10 cm;

blade spatulate to obovate, 0.8–8 cm, thin, base cuneate to slightly attenuate, margins serrate to dentate, eciliate or sparsely glandular-ciliate, surfaces abaxially glabrous, adaxially sparsely brown-hairy.

basal;

petiole rounded, 2–30 cm;

blade round, 7–40 cm, thin to slightly fleshy, base cordate to truncate, margins regularly dentate, eciliate, surfaces sparsely brownish hairy abaxially, glabrous adaxially.

Inflorescences

usually 10–15-flowered, lax, cylindric thyrses, (red), (4–)7–30 cm, sparsely purple-tipped stipitate-glandular.

10–30+-flowered, open, lax, flat-topped thyrses, 20–65(–85) cm, glabrous proximally, purple-tipped subsessile-glandular distally.

Flowers

sepals reflexed, oblong to elliptic;

petals white, each with 2 basal yellowish green spots, elliptic to round, clawed, 2–5.5 mm, longer than sepals;

filaments club-shaped, (to 6 mm);

pistils connate 1/2+ their lengths;

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

sepals reflexed, ovate to elliptic;

petals white, each with 2 basal yellow spots, round to broadly elliptic, clawed, 3–4.5 mm, longer than sepals;

filaments strongly club-shaped, (to 6 mm);

pistils connate ca. 1/2 their lengths;

ovary superior.

Capsules

green to yellow, distal 1/2 purple, ± folliclelike, (basally connate).

green to purple, ± folliclelike.

2n

= ca. 56, 58.

= 24, 48.

Micranthes lyallii

Micranthes odontoloma

Phenology Flowering summer–early autumn. Flowering summer–early autumn.
Habitat Wet, rocky meadows, mountain to alpine streamsides Wet meadows and stream banks
Elevation 800-4000 m [2600-13100 ft] 1500-4000 m [4900-13100 ft]
Discussion

Although they have nearly disjunct sets of populations, the subspecies of Micranthes lyallii are difficult to distinguish from each other. The more northern plants tend to be larger with wider leaves and often have been called Saxifraga lyallii subsp. or var. hultenii. Apparent hybrids with M. odontoloma occur in Alberta, British Columbia, and northern Idaho, and near Glacier National Park, Montana.

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

Distribution
from FNA
AK; ID; MT; WA; AB; BC; NT; YT
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[BONAP county map]
from FNA
AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC
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Parent taxa 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. hitchcockiana, M. howellii, M. idahoensis, M. integrifolia, 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. marshallii, M. micranthidifolia, M. nelsoniana, M. nidifica, M. nivalis, M. nudicaulis, M. occidentalis, 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
Synonyms Saxifraga lyallii, Saxifraga lyallii subsp. hultenii, Saxifraga lyallii var. hultenii Saxifraga odontoloma
Name authority (Engler) Small: in N. L. Britton et al., N. Amer. Fl. 22: 143. 1905 , (Piper) A. Heller: Muhlenbergia 8: 60. 1912 ,
Source Flora of North America vol. 8, p. 57. Flora of North America vol. 8, p. 56.
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