UW Burke Herbarium species comparison

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Micranthes apetala

Micranthes idahoensis

Tiny swamp saxifrage, western swamp saxifrage

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

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 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

Ovary less than 1/3 inferior, with 2 follicles

Micranthes apetala

Micranthes idahoensis
Flowering time March-May April-July
Habitat Vernally moist meadows at low to middle elevations. Exposed areas, ledges, and open slopes.
Distribution
Occurring east of the Cascades crest in Washington; Washington to Oregon, east to 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. 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, 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 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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