Petrophytum
rockmat
3 species
1 subspecies and varieties
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Petrophytum caespitosumRocky Mountain rockmat
Distribution: Occurring east of the Cascades crest in southeastern Washington; southeastern Washington to California, east to Montana, Idaho, New Mexico, Texas, and South Dakota.
Habitat: Dry, limy or granite cliffs, ledges, talus, and rocky slopes, lowland to alpine.
Origin: Native
Flowers: June-August
ssp. caespitosum – Rocky Mountain rockmat
Petrophytum cinerascensChelan rockmat
Distribution: Occurring east of the Cascades crest, where endemic to the Columbia River region of central Washington.
Habitat: Basaltic cliffs.
Origin: Native
Flowers: June-August
Growth Duration: perennial
Petrophytum hendersoniiOlympic Mountain rockmat
Distribution: Occurring west of the Cascades crest, where endemic to the Olympic Mountains.
Habitat: Rocky cliffs and talus slopes at middle to high elevations.
Origin: Native
Flowers: July-September
Growth Duration: perennial