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.
Flowers: June-August
Origin: Native
Conservation Status: Endangered in Washington (WANHP)
[none provided]
Publication: Mem. New York Bot. Gard. 1: 206. 1900.
PNW Herbaria: Specimen records of Petrophytum caespitosum ssp. caespitosum in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Petrophytum caespitosum ssp. caespitosum checklist entry.
OregonFlora: Petrophytum caespitosum ssp. caespitosum information.
E-Flora BC: Petrophytum caespitosum ssp. caespitosum atlas page.
CalPhotos: Petrophytum caespitosum ssp. caespitosum photos.
USDA Plants: Petrophytum caespitosum ssp. caespitosum information.
