Helianthemums - yellow, white, orange, pink and red available. Several low growing hardy geranium species. Aubretia, Iberis sempervirens, Aurinium saxatile, Saponaria ocymoides, Anthemis punctata subsp. cupaniana, Anthemis tinctoria, Dianthus, Festuca glauca (a grass), dwarf bearded iris - all classic tough full sun low growers. Tough hardy herbs like the various thymes, Oregano and different coloured Salvia officinalis. Lavender. BTW - Lysimachia nummularis needs moisture. It's a bog plant in its natural habitat. To start you off this season you could scatter Nasturtium, Limnanthes, Eschscholzia and other sun loving annual seed until your perennials fill out.

The advice you received was correct, despite the claims made by grass seed companies and their "shade mix" products: Grasses are definitely not going to do well with that little sun exposure. Mazus, Ajuga, and Green-and-Gold (Chrysogonum virginianum) come to mind as alternatives, but there are more options. Moisture will be the biggest concern as many shade groundcovers really cannot thrive if they are dry. There are some though, like barrenwort, that will do fine dry. Also, you need to specify how high you want the groundcover to be -- plants up to 1 ft. high are often considered groundcovers, but some people really prefer something that is only a few inches high. Personally, I really like U.S. native viola walteri var. 'Silver Gem' as a shade groundcover. Uploaded with ImageShack.us Click the link below, fill in your information about exposure, etc. and you will get some more choices. The conditions you list seem to leave you with many good possibilities. Good luck! Here is a link that might be useful: Groundcover Selector

Here is a list of some Drought tolerant Plants including ground covers.

Zack, I didn't post it because I hole heartedly agree with it. Again the "truth" might lie somewhere in the middle. I read "at" issues from many sides. The rancher manages 35,000 acres and I have found that controlling 17 acres is about making choices that have me riding a world where I do not control everything that comes my way. I can only imagine what the uncontrollable issues that he surfs. He has documented yellow star thistle patch and has found that it usually goes away after a decade if left alone. I found that surprising, even confusing. KR bluestem is a species that many people love to hate here in Texas. Yet I do see the butterflies going for their inflourescens during migration. I also see the native bluestem multiplying in the front field amongst them. It appears that on dry summers, it does not make much of an appearance or a very late one, giving the natives a chance to compete.. I know that I do not have the financial nor energy resources to dig them all out. Fire was said to control it but now they have back tracked on it. I am trying to keep it out of the valley where I have a delightful native community of Muhlenbergia s of different sorts. Nor do I want to poison everything out only to have the wind bring more to the empty soil. I was interested in the Monsanto angle of the board of directors mentioned in this Book review .It is more of the same thinking and written by David Theodoreopolis of J L Hudson Seedman fame, so he does have skin in the game and makes money selling possible invasive exotics AND natives. He is a controversial figure. I do find what he says about the fear of change valid and where do we stop the ecological clock since it is a forever changing thing. I just wish it would not change so fast. I have also and aesthetic concern about loosing some ground hugging spring ephemerals to the always land hungry bastard cabbage. Like I said, I do not agree with everything. that he says. I do find that much of the language used by some do or die native guys to be wishy washy as to what is a native and what is not. At the land conservationist meeting here in texas, there are 2 camps about the invasive grass KR Bluestem. 1 states it is a bad bad monoculture forming invasive that is good for nothing and and the other camp says it is a good land stabilizer and good at getting water to penetrate down to the water table. Another is that burr clover that was used as green manure and escaped. It grows in patches and I am tired of digging it up and it will improve my soil. My soil needs soil improvement desperately since invasively farmed cows have been overgrazing it for decades before I got here. Maybe it will disappear as it incorporates nitrogen into the soil.The soil washed away. I won't plant uncontrollable non natives because of the guilt if they escape issue. I prefer natives but I am a practical minded human when it comes to picking battles of whom I eradicate, where and how. The info keeps changing. I do not want to cause harm. But I do not know what is harm sometimes. My thinking is changeable about this subject. There is a lot on his site that is interesting. He uses Holistic land management ideas. He brings up that the removal of all herd animals off the grasslands and high deserts is harmful. .Balancing them is essential but these lands always had herd animals of sorts and many of the natural ones are gone and the niche is filled by cows. There is a connection between the desert tortoise populations and the herding of cows now. Desert tortoise populations have gone down where the removal of all cows have happened. Go figure. The politics of Rancher removal by the BLM is very troubling. Then they seem to give the rights of the land off to Uranium miners. Yes there is uranium under the Hammond's land. OOPS I didn't mean to open that can of worms.