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Micranthes lyallii

Lyall's saxifrage, red-stemmed saxifrage

rusty saxifrage

Habit Perennial with well-developed rhizomes, often forming small mats. Perennial from a short, woody base or thick rhizome, the 1-several leafless, freely-branched stems 1.5-3.5 dm. tall, soft-pubescent below and glandular-pubescent above.
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 all basal, oblanceolate, 2-10 cm. long and 5-15 mm. wide, with 7-17 teeth, thinly hairy, tapered gradually to broad, winged petioles not clearly differentiated from 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 an open, diffuse panicle extending nearly to the base of the stem;

calyx lobed almost to the base, the 5 lobes oblong-ovate, sharply reflexed, 1.5-2.5 mm. long, usually reddish or purplish;

petals 5, white, 4-6 mm. long, dimorphic, 3 much broader than the other 2;

stamens 10, the filaments slender and white;

flowers vary from all normal to mostly replaced by leafy bulblets.

Fruits

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

Ovary almost completely superior, capsule 4-6 mm. long;

carpels 2, fused their length.

Micranthes lyallii

Micranthes ferruginea

Flowering time July-September June-August
Habitat Wet, gravelly meadows and along streams and ponds at high elevations. Open, moist, often rocky areas, from low to middle elevations in the mountains.
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 Cascades and Olympic Mountains, and in the mountains of northeastern in Washington; Alaska to south California, east to Idaho, Montana, and Wyoming.
[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. fragosa, M. gormanii, M. idahoensis, M. integrifolia, M. lyallii, M. nelsoniana, M. nidifica, M. occidentalis, M. odontoloma, M. oregana, M. rufidula, M. tischii, M. tolmiei
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