This is the ''Owens Valley Morph'' within the ''Nemacladus sigmoideus complex''. Members of this complex are closely related and typically key to to N. sigmoideus in the current Jepson eFlora Nemacladus treatment...however author Nancy Morin is working on a revised treatment that recognizes & delineates a number of distinct taxa (such as this one) within the complex.

This taxon also appears in these posts by Steve Matson.

I found the population shown here 5 days after Steve showed me to the large 'original' population near Big Pine. The population here was also large (many hundreds of plants), but occurring in the Volcanic Tablelands of Mono County, about 25 miles to the north of Big Pine.

Postscript (4/25/20): This is now recognized as a new species, N. matsonii, per the treatment in:

• Nancy R. Morin and Tina J. Ayers (23 April 2020). 'New Species and a new Variety of Nemacladus (Campanulaceae, Nemacladoideae) and a Key to the Species', Madroño 67(1):35-60.

Some diagnostic characters include: flowers resupinate (corolla lobes '2 up, 3 down', anther column curved downward); corolla tube cup-shaped; filament tube reddish, anthers whitish; corolla lobes yellow-tipped & with yellow markings at the bases of the lower lobes; top portion of the filament tube & anthers with sparse, long, spreading hairs.