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Micranthes lyallii

Lyall's saxifrage, red-stemmed saxifrage

alpine saxifrage, Tolmie's alpine saxifrage, Tolmie's saxifrage

Habit Perennial with well-developed rhizomes, often forming small mats. Low, mat-forming perennial with numerous sterile, leafy branches, the flowering stems erect, 3-8 cm. tall, glabrous or pubescent with purplish-tipped hairs.
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 glabrous, entire, fleshy and nearly terete, 3-10 mm. long, spatulate to oblanceolate, narrowed to a broad base;

cauline leaves usually none, occasionally 1-3, reduced.

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.

Flowers terminal and single, or 2-4 in a loose inflorescence;

calyx saucer-shaped, glabrous, often purplish-tinged, the 5 oval, spreading lobes 2-3 mm. long;

petals 5, white, up to twice as long as the calyx lobes, broadly oblanceolate, narrowed to the base;

stamens 10, the filaments somewhat petaloid.

Fruits

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

Ovary about 1/4 inferior at flowering; capsule ovoid, 8-12 mm. long, purplish-mottled;

carpels sometimes 3 or more.

Micranthes lyallii

Micranthes tolmiei

Flowering time July-September June-September
Habitat Wet, gravelly meadows and along streams and ponds at high elevations. Mountain meadows, scree, and rock crevices at moderate to high elevations.
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]
Occurring in the Olympic and Cascade mountains in Washington; Alaska south to California, east to Idaho, Montana, Nevada and Utah.
[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. idahoensis, M. integrifolia, M. lyallii, M. nelsoniana, M. nidifica, M. occidentalis, M. odontoloma, M. oregana, M. rufidula, M. tischii
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