Link to San Francisco Woodland-Star (Lithophragma affine) observation that moth is resting on: https://www.inaturalist.org/observations/204826054

Greya obscura is in the Yucca Moths (Prodoxidae) family.

Greya Obscura Moth Photographers Group Range map for: Moth Photographers Group: https://mothphotographersgroup.msstate.edu/species.php?hodges=189.3

BugGuide: https://bugguide.net/index.php?q=search&keys=Greya

Butterflies and Moths of North America https://www.butterfliesandmoths.org/species_search (species not listed)

“In California, there are about 240 species of butterflies. There are more than 3,000 species of moths, which represent 4 suborders in about 50 families.”

Field Guide to California Insects, by Kip Will, J. Gross, D. Rubinoff , J. Powell, 2nd ed., 2020, p. 350-351.

Moths of Western North America by Jerry A. Powell and Paul A. Opler, 2009

BugGuide: Butterflies and Moths (US and Canada) clickable categories or use search bar: https://bugguide.net/node/view/57

Moth Photographers Group https://mothphotographersgroup.msstate.edu/species.php?hodges=7872&state=CA
(Be sure to limit the interface to California. The website is a little clunky but it’s better set up for moth taxonomy than BugGuide)

Geometer Moths (Geometridae family) in Monterey County: checklist with photos compiled by INat Kueda https://www.inaturalist.org/check_lists/260565-Geometridae-of-Monterey-County--CA--US?page=2