I immediately noticed this Nemacladus plant as I knelt down to photograph a Gilia (whose upcurved basal rosette is visible at upper left).

At first it seemed the flowers would be too shriveled for me to ascertain the species, then I noticed a flower close to the ground that was very small...but open and fresh! Once I got it focused at 1:1 magnification through my camera lens I could see it was “sigmoideus”-like...the corolla tips were yellow; the staminal-tube was covered with long, 'wildly-flying' trichomes with its tip pointing 'downward' towards the 'lower lip'; and all five corolla lobes were held on the abaxial side of a(n imaginary) line tangent to the edge of the calyx at the point nearest the flowering stem supporting the pedicel. That is, the corolla is irregular...but neither radial nor typically two-lipped. Instead, its five lobes are positioned as if spread out along a roughly semi-circular 'fan' (with the outer two lobes somewhat narrowed and recurved). And (as Nancy Morin, with much patience, once struggled to get me to understand ;-) the orientation of the corolla is 'inverted' relative to the typical disposition of flowers in the genus (see upper figures here)...so the three 'inner lobes' that form an 'upper lip' in typically-oriented Nemacladus flowers appear to form a 'lower lip' for species with flowers in the inverted state (which is why Nancy commented that my photo here was upside down!).

The flower in the 3rd photo herein looks somewhat like those posted by Steve Matson here...though the corolla lobes there seem a bit differently shaped (i.e. more deeply-cleft, elongate, and narrowly-obovate...and with a subtly different convexity). They also have more distinct yellow medial spots at the bases of the 'inner' three of the five clustered corolla lobes (and some of the flowers on Steve's plant have a substantial yellow band along the edges of the 'outer' two of the five lobes as well).

After taking a few photos with my usual 100 mm lens, I then got my MP-E 65 mm macro lens (which provides up to 5:1 magnification) to try to get more detailed images...but had focus & depth of field difficulties with that lens due to the high magnification (and handheld in the breeze ;-). Wish I had stayed longer to get more views, but I was (foolishly) in a hurry to get to another destination.

I looked carefully for more of these plants in the vicinity but found no others...although I did find two small patches of N. orientalis (with at least 10 and 30 plants, resp.) within about 150 yds of the single N. sigmoideus plant seen here. This is in accord with another insight offered by Nancy Morin...an informal principle that where you find one species of Nemacladus, you'll often find another nearby ;-).