Ceanothus 'Joyce Coulter' Rancho Santa Ana Botanic Garden, CA 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 1 Rancho Santa Ana Botanic Garden, CA 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 10a La Posta Road, CA 130419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 10b La Posta Road, CA 130419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 11 Julian, CA 130422 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 2a Rancho Santa Ana Botanic Garden, CA 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 2b Rancho Santa Ana Botanic Garden, CA 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 2c Rancho Santa Ana Botanic Garden, CA 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 2d Rancho Santa Ana Botanic Garden, CA 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 2e Rancho Santa Ana Botanic Garden, CA 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 3a Rancho Santa Ana Botanic Garden, Los Angeles 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 3b Rancho Santa Ana Botanic Garden, Los Angeles 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 3c Rancho Santa Ana Botanic Garden, Los Angeles 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 4a Santa Margarita River, CA 130415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 4b Santa Margarita River, CA 130415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 4c Santa Margarita River, CA 130415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 7 Santa Barbara Botanic Garden, CA 130411 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 8a Kitchen Creek Road, CA 130419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 8b Kitchen Creek Road, CA 130419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 9a La Posta Road, CA 130419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 9b La Posta Road, CA 130419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 9c La Posta Road, CA 130419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 9d La Posta Road, CA 130419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 9e La Posta Road, CA 130419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 9f La Posta Road, CA 130419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus crassifolius Oak Park, CA 130410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus leucodermis 1 Rancho Santa Ana Botanic Garden, CA 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus leucodermis 2 Rancho Santa Ana Botanic Garden, CA 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus leucodermis 3 Rancho Santa Ana Botanic Garden, CA 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus spinosus 2 (cult) La Brea Tar Pits, Los Angeles, CA 130429 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus verrucosus 1 Torrey Pines, San Diego, CA 130418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus verrucosus 2 Torrey Pines, San Diego, CA 130418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus verrucosus 3 Torrey Pines, San Diego, CA 130418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus vestitus 1 Rancho Santa Ana Botanic Garden, CA 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus vestitus 2 Rancho Santa Ana Botanic Garden, CA 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus vestitus 3 Rancho Santa Ana Botanic Garden, CA 130406 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 5a Santa Barbara Botanic Garden, CA 130411 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 5b Santa Barbara Botanic Garden, CA 130411 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus 8c Kitchen Creek Road, CA 130419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ceanothus spinosus 1 (cult) La Brea Tar Pits, Los Angeles, CA 130429 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).