The plant is very likely Clarkia purpurea. I do not think a species id is possible from the image. Species id for Clarkia, can involve the petal length and color, the length and ribbing of the seed pod, and other details. I suspect these are not sufficiently evident in this photo to easily allow an id of the plant.

One comment: Although I'm not objecting to you frassing the photo, the photograph does show the larva (although very small) as well as the plant and demonstrates what they look like in their habitat. Still, I don't mind and it's no problem if you feel that the image does not belong in the guide and should be frassed.

Posting host plants images are allowed to get IDs, then frassed. See instructions here. http://bugguide.net/node/view/487026
No one can see your full-size images except you and the editors, that is why the instructions state to crop all image to just the bug before posting. To everyone else this image shows almost nothing at all, but a sea of green. We use the info pages and the remarks section to post host and habitat data as well as any other observations.

ive been trying to find foodplants of this...in my field..

this does show the foodplant, the foodplant is the plant the caterpillar is resting at the base of (tall, thin, plant with long leaves held close to the stem). I believe the understanding is that the moth likely uses any Clarkia sp. for a hostplant as well as some other species in the evening primrose species family.

thanks..just tag it and move it back..also any chance you would send me seed of this particular clarkia?

Sorry for how long it has taken me to get back to you!

Sure, I'd be willing to send you some seeds from this specific Clarkia. After looking at CalPhotos again, since commenting earlier, I think my Clarkia is quite likely C. affinis. In this population area (oak grassland, in other habitats in this county, Clarkia blooms later), the seeds are probably fully mature and dry in June or so (quite likely earlier this year, they were blooming in March!), I'd guess. What address should I send them to?

To find the Clarkia in your area, I'd look for the blooming plants. Apparently (from the document I've linked to) in your area you may be able find them from late spring through mid-summer (in this area of SLO County, they would certainly not be blooming in mid-summer). This document on Clarkia amoena might be of interest. Clarkia flowers are usually pink, and the flower shape is often similar to that of a small poppy, but some species (such as C. unguiculata) have elongated petals. To get some idea of what the flowers and plants look like it may be helpful to check out some of the Clarkia photos here at Berkeley's CalPhoto database.