Burke: Micranthes lyallii vs. Micranthes idahoensis

	Micranthes lyallii	Micranthes idahoensis
	Lyall's saxifrage, red-stemmed saxifrage	Idaho saxifrage
Habit	Perennial with well-developed rhizomes, often forming small mats.	Herbaceous perennial from short, horizontal rhizomes, the 1-3 leafless, pubescent stems 1-2.5 dm. tall.
Leaves	Leaves all basal, the leaves wedge-shaped to fan-shaped, 10-25 mm. long and nearly as broad, coarsely dentate with 7-9 teeth, with slender petioles of similar length, glabrous or with a few soft, brown hairs.	Leaves basal, the blades elliptic, up to 6 cm. long and 3 cm. wide, with 15-30 rounded teeth; petioles slightly winged, 1-3 times as long as the blades.
Flowers	Inflorescence, calyx and fruits often bright red; inflorescence a cyme with up to 15 flowers, the peduncles slender, often with linear, entire bracts; calyx lobed almost to the base, the 5 lobes oblong-lanceolate, 2-3 mm. long, sharply reflexed; petals 5, white, aging to pink, 2.5-4 mm. long, the blade oblong-oval, rounded to a short, broad claw; stamens 10, equaling the petals, the filaments white, club-shaped; carpels often 3-5, fused only 0.5-1 mm., the ovary mostly superior, the carpels tapered to styles less than 1 mm. long.	Inflorescence pyramidal, open, up to 10 cm. long, the branches ascending; calyx divided about half its length, the 5 ovate lobes 1-2.5 mm. long; petals 5, white, broadly elliptic, 1.5-3 mm. long, with 2 yellow spots near the base; stamens 10, the filaments petaloid, strongly club-shaped, 3-4 times as broad above the middle as at the base.
Fruits	Follicle 7-12 mm. long exclusive of the slender, divergent, stylar beaks.	Ovary less than 1/3 inferior, with 2 follicles

	Micranthes lyallii	Micranthes idahoensis
Flowering time	July-September	April-July
Habitat	Wet, gravelly meadows and along streams and ponds at high elevations.	Exposed areas, ledges, and open slopes.
Distribution	Occurring on both sides of the Cascades crest in northern Washington; Alaska to Washington, east to Alberta, Idaho, and Montana. [WildflowerSearch map] [BONAP county map]	Washington and Oregon, east to Montana and Idaho. [WildflowerSearch map] [BONAP county map]
Origin	Native	Native
Conservation status	Not of concern	Not of concern
Sibling taxa	M. apetala, M. ferruginea, M. fragosa, M. gormanii, M. idahoensis, M. integrifolia, M. nelsoniana, M. nidifica, M. occidentalis, M. odontoloma, M. oregana, M. rufidula, M. tischii, M. tolmiei	M. apetala, M. ferruginea, M. fragosa, M. gormanii, M. integrifolia, M. lyallii, M. nelsoniana, M. nidifica, M. occidentalis, M. odontoloma, M. oregana, M. rufidula, M. tischii, M. tolmiei
Web links	Local floras: BC, WA Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, OR, WA Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Micranthes idahoensis

Lyall's saxifrage, red-stemmed saxifrage

Idaho saxifrage

Habit

Perennial with well-developed rhizomes, often forming small mats.

Herbaceous perennial from short, horizontal rhizomes, the 1-3 leafless, pubescent stems 1-2.5 dm. tall.

Leaves

Leaves all basal, the leaves wedge-shaped to fan-shaped, 10-25 mm. long and nearly as broad, coarsely dentate with 7-9 teeth, with slender petioles of similar length, glabrous or with a few soft, brown hairs.

Leaves basal, the blades elliptic, up to 6 cm. long and 3 cm. wide, with 15-30 rounded teeth;

petioles slightly winged, 1-3 times as long as the blades.

Flowers

Inflorescence, calyx and fruits often bright red; inflorescence a cyme with up to 15 flowers, the peduncles slender, often with linear, entire bracts;

calyx lobed almost to the base, the 5 lobes oblong-lanceolate, 2-3 mm. long, sharply reflexed;

petals 5, white, aging to pink, 2.5-4 mm. long, the blade oblong-oval, rounded to a short, broad claw;

stamens 10, equaling the petals, the filaments white, club-shaped;

carpels often 3-5, fused only 0.5-1 mm., the ovary mostly superior, the carpels tapered to styles less than 1 mm. long.

Inflorescence pyramidal, open, up to 10 cm. long, the branches ascending;

calyx divided about half its length, the 5 ovate lobes 1-2.5 mm. long;

petals 5, white, broadly elliptic, 1.5-3 mm. long, with 2 yellow spots near the base;

stamens 10, the filaments petaloid, strongly club-shaped, 3-4 times as broad above the middle as at the base.

Fruits

Follicle 7-12 mm. long exclusive of the slender, divergent, stylar beaks.

Ovary less than 1/3 inferior, with 2 follicles