Purdy 1069.
ID notes: lvs well distributed along stem, proximal lvs appearing to wither in age, lvs triangular and prominently dentate.
Purdy 1083.
ID notes: Seed rows ± 3 above mid-fruit; seeds irregular-rounded to -angular, flower bracts not concealing fruits, ± white below middle.
Purdy 1089.
Seeds up to 4/fruit, plants perennial from thick woody taproot.
Purdy 1093.
Only two Argemone/prickly poppies in CA and the other one only up to 1200m and with lvs less prickly adaxially.
Purdy 1095.
Plants/population entirely vegetative, but distinctive! No other likely candidates with this foliage in the area. Growing in Piper Fire (2002) burn scar.
Purdy 1097.
Fruits gen >=3.5mm wide. Fruit margins rather parallel, but otherwise keys easily here and seems to be a good fit. No flowers so pollen shape and ploidy level unknown.
Purdy 1100.
Dinstinctive fine, short, dense, and recurved hairs covering stem and foliage lending plant a sagey green-glaucous color. Keyed pretty easily and common species. Grey/glaucous foliage, Stem hairs short (< 0.25 mm), very dense, uniform, and recurved, lvs >=4mm wide (gen 4-5mm), stems gen >20cm, peduncle relatively short + slender.
Purdy 1104.
Some plants along road here with interesting swollen stem galls.