Erosion control plants

I'd like some advice for planting on an irrigated, very steep hill in the
Hollywood Hills. Once established, we'd like to restrict the irrigation.
Does anyone have suggestions for plant material that will provide a
thick mat of roots to hold the topsoil of the hillside?

The old Sunset Western Garden books used to include a list of plants for hillsides. I keep all my old books, because the new versions don't just add information, they also delete information I want.

Here are plants they suggest for hillside erosion control. I am not considering watering requirements. You will also need to check to see if these are more rampant than you want. I left off a few that I know have been spreading into the wild, like pampas grass and Spanish broom, but there are others that may no longer be considered acceptable, like ivy.

I'm assuming Hollywood Hills is near Beverly Hills, which is Sunset zone 23.

Shrubs:
Ceanothus gloriosus, griseus, g. horizontalis, 'Joyce Coulter'
Cistus
Coprosma kirkii
Cotoneaster, low-growing ones
Echium fastuosum
Eriogonum fasciculatum
Fallugia paradoxa
Hypericum calycinum
Jasminum mesnyi
Juniperus, low-growing
Lantana montevidensis
Osteospermum
Rhus integrifolia
Ribes viburnifolium
Rosa banksiae, bracteata 'Mermaid', roxburghii
Rosmarinus officinalis
Santolina

Vines:
Cissus antarctica, hypoglauca
Hedera
Lonicera henryi, japonica 'Halliana'
Parthenocissus quinquefolia
Passiflora jamesonii
Rhoicissus capensis
Solandra hartwegii
Tetrastigma
Trachelospermum jasminoides

Grasses
Bamboo

Succulents
Delosperma
Drosanthemum
Lampranthus aurantiacus, filicaulis
Malephora crocea
Sedum

--
Diane Whitehead  Victoria, British Columbia, Canada
maritime zone 8
cool mediterranean climate (dry summer, rainy winter - 68 cm annually)
sandy soil

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