Consider this a very small, very partial list of some of my current favorites. There are many, many choice plants you can add to your garden that are drought tolerant.
Drought Tolerant Trees· Crape Myrtle—Lagerstroemia cultivars
· Madrone—Arbutus menziesii
· Maidenhair Tree - Gingko biloba
· Strawberry Tree—Arbutus unedo
Drought Tolerant Shrubs
· Ceanothus (Favorites: ‘Victoria’, ‘Concha’, ‘Diamond Heights’)
· Mediterranean Fan Palm—Chamaerops humilus
· Olearia macrodonta
· Olearia x haastii
· Rock Rose—Cistus
· Smoke Tree—Cotinus ‘Golden Spirit’
· Smoke Tree—Cotinus ‘Royal Purple’
Drought Tolerant Perennials
· Acanthus mollis
· Acanthus spinosus
· Agastache
· Cape Fuchsia—Phygelius (Favorites: P. ‘Moonraker’, P. ‘New Sensation’)
· Coneflowers—Echinacea purpurea
· Daylilies—Hemerocallis
· Dianthus
· Eryngium ‘Sapphire Blue’
· Euphorbia
· False Indigo—Baptisia australis
· Kniphofia
· Lamb’s Ears—Stachys
· Lavender
· Mullein—Verbascum (Favorites: V. ‘Jackie’, V. ‘Gainsborough’, V. ‘Violetta’)
· Parahebe perfoliata
· Penstemon (Favorites: P. ‘Margarita BOP’, P. ‘Alice Hindley’)
· Peony
· Phlomis fruticosa
· Phlomis russelliana
· Poppies
· Salvia (Favorites: S. ‘Purple Rain’, S. ‘Plumosa’)
· Sedum (Favorites: S. ‘Autumn Joy’, S. ‘Lynda Windsor’)
· Yarrow—Achillea (Favorites: A. ‘Terra Cotta’)
Drought Tolerant Grasses
· Black Mondo Grass—Ophiopogon planiscapus 'Nigrescens'
· Blue Oat Grass—Helictotrichon sempervirens
· Carex f. ‘Toffee Twist’
· Carex testacea
· Feather Reed Grass, variegated—Calamagrostis x acutiflora 'Avalanche'
· Feather Reed Grass—Calamagrostis acutiflora 'Karl Foerster'
· Giant Feather Grass—Stipa gigantea
· Luzula s. ‘Aurea’
· Mexican Feather Grass—Stipa tenuissima
· Red Tussock Grass—Chionochloa rubra