On the brink of extirpation at this location with only a single small individual remaining. Area filled with invasive plants and several discarded heroin needles.
Lupine with very well-separated tight flower whorls and reddish stems; leaflets (in 6-9s) thin and pointed at the tip with minutely pubescent undersides. Flower features all fitting for rivularis; no other Lupinus seen at this location.
Other iNat observation of this population from a year ago.