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Growing on a dry rocky outcrop. This is a very unusual site, with Pellaea andromedifolia (mostly a California species) growing nearby.
See previous observation from this site:
https://www.inaturalist.org/observations/197196212
This site is at high risk of getting destroyed in quarry operations in the near future.

30+ plants here. The population seems to occur only in one small area of north-facing basalt. Habitat in this area is typically very dry and rocky, with meadows, oak woodland, and basalt outcrops being the primary features.
Plants growing in similar habitat to the summit area of Spencer Butte, where this species is also found.
This population is one of few known in the Willamette Valley.
@jamesgrasstoucher @eralverson @brucen

Only one tree found at this site. Growing in the shade of abundant Pseudotsuga menziesii and Arbutus menziesii. Nearby, and observed on the same day, coincidentally: https://www.inaturalist.org/observations/202721413
https://www.inaturalist.org/observations/202745456

Photos of Phacelia lenta at the time and place of its rediscovery in 1981. The species was described by CV Piper in 1901, on the basis of a single collection by TS Brandegee from 1883 (see https://plants.jstor.org/stable/10.5555/al.ap.specimen.gh00093407). The type specimen is just labeled "bare hills of the Columbia", so no one really knew where to look for it. Phacelia lenta turns out to be a very local endemic, with a total geographic range spanning only about 10 or 15 miles.

Rare but highly distinctive endemic of the understory of pine forests south of El Salto, Durango. This is a rarely documented species, but it should be looked for in this area of Durango. This observation is also documented with an herbarium collection, M. Egger 1287, WTU.

Lane County OR, the farthest north known site of this species by about 70 miles. Collected in 1934, again in 1969 and 1982. Population previously presumed extinct, currently appears to be stable. This population had not been recorded in 41 years. Growing in rocky, south facing open habitat near Jasper, Oregon. @eralverson @brucen @jamesgrasstoucher @frondsinhighplaces @tanyaharvey

This is the very northern-most known locality for this species and the only known locality from the Willamette Basin. First collected at this site in 1934, and subsequently in 1969 and 1982, but not seen again until this year despite searching. About 24 plants were observed in this patch, including a range of plant sizes, suggesting that the population is healthy. See also https://www.inaturalist.org/observations/189415390.

This is a high elevation site (5100 ft/ 1555 m) located well in to the western Cascades. While this is a high elevation site that receives a large amount of winter snowfall (Tsuga mertensiana and Abies lasiocarpa grow close by), the site is a warm microsite sheltered by a south-facing cliff. I am a bit perplexed because these higher elevation oaks often have the bud shape characters of vars. breweri and semota as per FNA (http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=233501033), but I don't believe these plants are actually var. breweri or var. semota as they are outside the known ranges of those vars.